Engineering & calculations
Sheet metal bend allowance calculator
Use an entered K-factor to locate the neutral axis and calculate the developed length of one circular curved bend.
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NaNa Apps
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193 apps & tools
All: 193
Engineering & calculations
First-order CSTR conversion calculator
Calculate the steady-state conversion of an irreversible first-order reaction in a perfectly mixed continuous stirred-tank reactor.
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Engineering & calculations
Welding heat input per length calculator
Calculate the thermal energy delivered to the workpiece per weld length for constant voltage, current and travel speed.
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Engineering & calculations
Electroplating deposited mass calculator
Use Faraday's law and the entered current efficiency to calculate the mass deposited by the desired electrode reaction.
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Engineering & calculations
Ideal mixture bubble-point pressure calculator
Calculate the total pressure at the onset of boiling in an ideal liquid solution from liquid composition and pure-component vapor pressures at a common temperature.
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Engineering & calculations
Reaction equilibrium constant calculator
Calculate the dimensionless thermodynamic equilibrium constant from the standard reaction Gibbs energy for a specified reaction and standard state.
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Engineering & calculations
Ideal gas mixing entropy calculator
Find the entropy increase when distinct ideal gases, initially separated at the same temperature and pressure, are mixed.
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Engineering & calculations
Internally heated slab center temperature calculator
Calculate the steady maximum center temperature of a uniformly heated slab whose two surfaces have the same prescribed temperature.
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Engineering & calculations
Insulated-tip fin efficiency calculator
Compare heat transfer from a straight uniform fin with the ideal heat transfer if its entire surface were at the base temperature.
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Engineering & calculations
Hall Voltage Calculator
Calculate signed Hall voltage for a flat sample with a single carrier type.
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Engineering & calculations
Counterflow heat exchanger calculator
Calculate the steady heat transfer rate of a single-pass counterflow exchanger from UA, stream heat capacity rates and inlet temperatures.
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Engineering & calculations
Complex Load VSWR Calculator
Calculate voltage standing wave ratio from a real reference impedance and a finite complex load impedance.
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Engineering & calculations
Cascaded Noise Figure Calculator
Combine the power gain and noise figure of an ordered list of stages using the Friis cascade relation.
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Engineering & calculations
Free-Space Path Loss Calculator
Calculate isotropic-reference path loss caused by geometric spreading in far-field free-space propagation.
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Engineering & calculations
Coaxial Characteristic Impedance Calculator
Calculate the lossless TEM characteristic impedance of a concentric coaxial line from its conductor radii and uniform dielectric properties.
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Engineering & calculations
Shannon Channel Capacity Calculator
Calculate the Shannon capacity of a band-limited AWGN channel from bandwidth and received SNR.
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Engineering & calculations
Sampling Jitter SNR Calculator
Estimate the signal-to-noise ratio imposed solely by timing jitter when sampling a sine wave.
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Engineering & calculations
Sampling Alias Frequency Calculator
Fold a uniformly sampled real sinusoid into the frequency interval from zero to half the sampling rate.
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Engineering & calculations
ADC Quantization Noise Calculator
Calculate ideal RMS quantization error for a uniform N-bit quantizer across its full input voltage span.
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Engineering & calculations
Resistor Thermal Noise Calculator
Estimate the RMS open-circuit thermal noise voltage of a resistor from its temperature and equivalent noise bandwidth.
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Engineering & calculations
Circulation Lift per Unit Span Calculator
Calculate signed lift per unit span from the Kutta–Joukowski relation for steady two-dimensional circulation flow.
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Engineering & calculations
Finite-Depth Gravity Wave Wavelength Calculator
Solve the finite-depth linear gravity-wave dispersion equation for positive wavenumber to obtain wavelength, continuously spanning shallow and deep water.
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Engineering & calculations
Rotating Liquid Free-Surface Height Difference Calculator
Calculate the signed free-surface height difference between two radial positions when liquid rotates as a rigid body with its container.
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Engineering & calculations
Plane Couette Flow Drag Force Calculator
Calculate the viscous drag-force magnitude on one face of a moving plate from the linear velocity profile between parallel plates.
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Engineering & calculations
Hydraulic Jump Sequent Depth Calculator
Calculate the downstream sequent depth corresponding to supercritical upstream flow in a horizontal rectangular channel using momentum conservation.
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Engineering & calculations
Joukowsky Water Hammer Pressure Change Calculator
Estimate the initial pressure wave generated at a downstream disturbance and travelling upstream after a rapid change in liquid speed.
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Engineering & calculations
Cavitation Number Calculator
Calculate a cavitation index by dividing the margin between reference absolute pressure and saturation vapor pressure by dynamic pressure.
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Engineering & calculations
Bond Number Calculator
Calculate the magnitude ratio of gravity due to the density difference between two fluids to interfacial tension.
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Engineering & calculations
Froude Number Calculator
Calculate the Froude number for open-channel flow using the section-mean speed and hydraulic depth, defined as flow area divided by free-surface top width.
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Engineering & calculations
Weber Number Calculator
Calculate the ratio of inertia to interfacial-tension effects for a stated characteristic length and relative speed.
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Engineering & calculations
Forced-vibration steady amplitude calculator
Compute the harmonic steady displacement amplitude of a single-degree-of-freedom mass-spring-damper system.
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Engineering & calculations
Miner cumulative fatigue damage calculator
Sum fatigue-damage fractions from an editable list of applied and allowable cycle counts.
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Engineering & calculations
Point-mass moment of inertia calculator
Sum the moment of inertia of a list of point masses using perpendicular distances to one stated axis.
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Engineering & calculations
Exact open belt length calculator
Compute an uncrossed belt’s pitch-line length using tangent and circular-arc geometry.
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Engineering & calculations
Capstan limiting rope tension calculator
Find the larger rope tension at impending slip around a cylindrical drum.
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Engineering & calculations
Atwood acceleration with pulley inertia calculator
Compute the acceleration of two hanging masses connected over a pulley with rotational inertia.
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Engineering & calculations
Horizontal Coriolis acceleration calculator
Compute the Coriolis acceleration component perpendicular to horizontal motion at a stated latitude.
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Engineering & calculations
Rolling acceleration on an incline calculator
Compute down-slope acceleration while accounting for both translation and rotation.
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Engineering & calculations
Gyroscope precession calculator
Estimate slow steady gravitational precession for a rapidly spinning symmetric gyroscope.
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Engineering & calculations
Collision velocity with restitution calculator
Find the first body’s final velocity from linear momentum and the coefficient of restitution.
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Engineering & calculations
Faraday Polarization Rotation Calculator
Calculate Faraday polarization rotation in a uniform longitudinal magnetic field.
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Engineering & calculations
Nuclear Reaction Q Value Calculator
Calculate the energy release or absorption per reaction from the total rest-mass difference.
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Engineering & calculations
Gaussian Beam Radius Calculator
Calculate the radius of an ideal Gaussian beam at a distance from its waist.
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Engineering & calculations
Malus Law Transmitted Intensity Calculator
Calculate the intensity of linearly polarized light after an ideal analyzer.
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Engineering & calculations
Photoelectric Stopping Voltage Calculator
Calculate the reverse voltage magnitude needed to stop the fastest photoelectrons in a single-photon model.
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Engineering & calculations
Quantum Harmonic Oscillator Energy Calculator
Calculate a one-dimensional quantum harmonic oscillator level including its zero-point energy.
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Engineering & calculations
Compton Scattering Wavelength Shift Calculator
Calculate the photon wavelength increase when scattering from an initially stationary free target.
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Engineering & calculations
Hydrogen Transition Wavelength Calculator
Estimate a hydrogen emission wavelength between two principal quantum numbers using a Rydberg model.
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Engineering & calculations
Exoplanet Transit Depth Calculator
Calculate the ideal fraction of stellar light blocked by an opaque planet fully within the stellar disk.
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Engineering & calculations
Infinite Quantum Well Energy Calculator
Calculate an energy level for a particle confined in a one-dimensional infinite square well.
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Engineering & calculations
Rectangular Barrier Transmission Calculator
Calculate the transmission probability below, at and above a rectangular barrier.
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Engineering & calculations
Gravitational Redshift Calculator
Calculate the gravitational wavelength shift between two static observers in exterior Schwarzschild spacetime.
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Engineering & calculations
Eddington Luminosity Calculator
Calculate the spherical Eddington luminosity scale where radiative and gravitational acceleration balance.
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Engineering & calculations
Jeans Mass Calculator
Calculate the mass of a critical-wavelength sphere in the linear Jeans instability model.
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Engineering & calculations
Fluid Satellite Roche Limit Calculator
Estimate the classical tidal disruption distance for a fluid satellite without tensile strength.
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Engineering & calculations
Einstein Ring Angular Radius Calculator
Calculate the Einstein ring angular radius for an aligned point lens in local Euclidean geometry.
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Engineering & calculations
Rocket Nozzle Thrust Calculator
Calculate axial rocket nozzle thrust from exhaust momentum and the exit-to-ambient pressure difference.
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Engineering & calculations
Tidal Differential Acceleration Calculator
Calculate the difference in Newtonian gravitational acceleration magnitudes at two radially aligned points.
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Engineering & calculations
Hill Sphere Radius Calculator
Estimate the Hill radius of a low-mass body on a circular orbit around a primary.
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Engineering & calculations
Tsiolkovsky Rocket Delta V Calculator
Calculate the ideal delta v from one rocket burn using total masses and effective exhaust speed.
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Documents & text
World Law Library
Read national legislation as HTML in its original language. Browse documents with official sources, edition information and reuse terms.
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Engineering & calculations
Logarithmic Decrement Calculator
Calculate logarithmic decrement from same-direction free-decay peaks.
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Engineering & calculations
Independent Length Uncertainty Calculator
Combine independent length standard uncertainties for a linear model.
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Engineering & calculations
Incompressible Orifice Flow Calculator
Calculate incompressible orifice flow with negligible upstream velocity.
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Engineering & calculations
Stokes Particle Terminal Velocity Calculator
Calculate terminal velocity of a small sphere in creeping flow.
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Engineering & calculations
Henry Law Dissolved Concentration Calculator
Calculate dissolved concentration using an explicit solubility-form Henry constant.
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Engineering & calculations
Radioactive Activity Decay Calculator
Calculate activity decay of a single nuclide with a constant decay rate.
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Engineering & calculations
Nernst Potential Calculator
Calculate an equilibrium potential for a specified reaction quotient and temperature.
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Engineering & calculations
Ideal Dilute Solution pH Calculator
Calculate concentration-based pH with an activity coefficient of one.
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Engineering & calculations
Acoustic Doppler Frequency Calculator
Calculate classical one-dimensional acoustic Doppler frequency.
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Engineering & calculations
Sound Pressure Level Calculator
Calculate sound pressure level relative to an explicit reference pressure.
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Engineering & calculations
Diffraction Grating Angle Calculator
Calculate a specified positive diffraction-order angle at normal incidence.
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Engineering & calculations
Double Slit Fringe Spacing Calculator
Calculate double-slit fringe spacing in the far-field small-angle approximation.
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Engineering & calculations
Normal Incidence Fresnel Reflectance Calculator
Calculate intensity reflectance at normal incidence between lossless dielectrics.
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Engineering & calculations
RC Low Pass Magnitude Calculator
Calculate magnitude response of an unloaded RC low-pass filter.
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Engineering & calculations
Noninverting Op Amp Gain Calculator
Calculate ideal noninverting negative-feedback voltage gain.
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Engineering & calculations
Good Conductor Skin Depth Calculator
Calculate the electromagnetic amplitude 1/e depth in the good-conductor approximation.
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Engineering & calculations
AC Real Power Calculator
Calculate average real power from sinusoidal RMS voltage, current and phase.
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Engineering & calculations
Series RLC Impedance Calculator
Calculate sinusoidal impedance magnitude of an ideal series RLC circuit.
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Engineering & calculations
Ideal Transformer Voltage Calculator
Calculate ideal AC transformer secondary voltage from the turns ratio.
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Engineering & calculations
Point Charge Electric Field Calculator
Calculate the field magnitude of an isolated point charge in vacuum.
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Engineering & calculations
Capillary Rise Calculator
Calculate static rise or depression in a circular capillary.
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Engineering & calculations
Displaced Fluid Buoyancy Calculator
Calculate buoyancy from the weight of displaced fluid.
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Engineering & calculations
Log Mean Temperature Difference Calculator
Calculate LMTD from two positive terminal temperature differences.
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Engineering & calculations
Adiabatic Ideal Gas Temperature Calculator
Calculate final temperature for a reversible adiabatic ideal-gas process.
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Engineering & calculations
Ideal Gas Isothermal Work Calculator
Calculate reversible isothermal pressure-volume work done by an ideal gas.
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Engineering & calculations
Sensible Heat Calculator
Calculate sensible heat for heating or cooling without a phase change.
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Engineering & calculations
Thermal Diffusivity Calculator
Calculate thermal diffusivity from conductivity and volumetric heat capacity.
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Engineering & calculations
Nusselt Number Calculator
Convert a known convection coefficient to a Nusselt number.
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Engineering & calculations
Prandtl Number Calculator
Calculate the ratio of momentum diffusivity to thermal diffusivity.
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Engineering & calculations
Rayleigh Number Calculator
Calculate the Rayleigh number for a specified natural-convection configuration.
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Engineering & calculations
Cantilever Tip Deflection Calculator
Calculate tip deflection of a slender cantilever under a tip point load.
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Engineering & calculations
Circular Tube Area Moment Calculator
Calculate the second moment of area of a circular tube about a centroidal diameter.
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Engineering & calculations
Spring Potential Energy Calculator
Calculate energy stored in a stretched or compressed linear spring.
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Engineering & calculations
Critical Sliding Incline Angle Calculator
Calculate the onset-of-sliding incline angle in a Coulomb friction model.
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Engineering & calculations
Friction Stopping Distance Calculator
Calculate sliding stopping distance with constant kinetic friction.
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Engineering & calculations
Two Mass Center of Mass Calculator
Calculate the center of mass of two point masses on one axis.
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Engineering & calculations
Series Spring Stiffness Calculator
Calculate the equivalent stiffness of two linear springs in series.
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Engineering & calculations
Average Force Impulse Calculator
Calculate one-dimensional impulse from average force and duration.
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Engineering & calculations
Projectile Range Calculator
Calculate ideal projectile range when launch and landing heights match.
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Engineering & calculations
Free Fall Time Calculator
Calculate fall time from rest in uniform gravity.
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Engineering & calculations
Gas Molecular RMS Speed Calculator
Calculate the RMS translational molecular speed of an ideal gas.
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Engineering & calculations
De Broglie Wavelength Calculator
Calculate a matter-wave wavelength from momentum.
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Engineering & calculations
Relativistic Kinetic Energy Calculator
Calculate translational kinetic energy using special relativity.
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Engineering & calculations
Lorentz Factor Calculator
Calculate the Lorentz factor from relative speed.
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Engineering & calculations
Schwarzschild Radius Calculator
Calculate the horizon radius of a nonrotating uncharged black hole model.
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Engineering & calculations
Gravity at Radius Calculator
Calculate the gravitational acceleration outside a spherical body.
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Engineering & calculations
Gravitational Potential Energy Calculator
Calculate gravitational potential energy relative to infinity.
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Engineering & calculations
Hohmann Transfer Total Delta V Calculator
Calculate the total impulsive speed change between coplanar circular orbits.
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Engineering & calculations
Circular Orbit Period Calculator
Calculate the period of an ideal circular orbit.
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Engineering & calculations
Escape Speed Calculator
Calculate the minimum initial speed to escape an isolated body.
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Engineering & calculations
Mass Spring Damping Ratio Calculator
Check viscous damping relative to critical damping in a linear vibration model.
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Engineering & calculations
First Order Settling Time Calculator
Check waiting time for a stable first-order process or sensor response.
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Engineering & calculations
Step Index Fiber Numerical Aperture Calculator
Check numerical aperture from core and cladding refractive indices.
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Engineering & calculations
Snell Refraction Angle Calculator
Check a refracted ray angle measured from the interface normal.
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Engineering & calculations
Circular Aperture Resolution Calculator
Check the Rayleigh diffraction angle for an ideal circular aperture.
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Engineering & calculations
Thin Lens Image Distance Calculator
Check signed image distance in a paraxial thin-lens model.
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Engineering & calculations
Photon Energy from Wavelength Calculator
Convert a vacuum wavelength to single-photon energy for basic spectroscopy.
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Engineering & calculations
Dilute Solution Osmotic Pressure Calculator
Check osmotic pressure with the ideal dilute-solution approximation.
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Engineering & calculations
First Order Half Life Calculator
Check the half life of an ideal first-order disappearance or decay process.
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Engineering & calculations
Arrhenius Rate Constant Calculator
Check the temperature dependence of a reaction rate constant.
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Engineering & calculations
Gas Mean Free Path Calculator
Check a dilute gas mean free path in kinetic theory or vacuum experiments.
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Engineering & calculations
Ideal Gas Density Calculator
Check ideal gas density from absolute pressure, molar mass and temperature.
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Engineering & calculations
Pinned Column Euler Buckling Calculator
Check ideal elastic buckling load for a slender pinned column.
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Engineering & calculations
Circular Shaft Twist Angle Calculator
Check twist between the ends of a uniform circular shaft.
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Engineering & calculations
Maximum Beam Bending Stress Calculator
Convert a known bending moment to the extreme-fiber normal stress.
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Engineering & calculations
Fully Restrained Thermal Stress Calculator
Check uniaxial thermal stress when a bar cannot expand.
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Engineering & calculations
Axial Bar Extension Calculator
Check axial length change from a known load and material modulus.
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Engineering & calculations
Solid Circular Shaft Shear Stress Calculator
Check maximum torsional shear stress for an initial shaft diameter.
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Engineering & calculations
Average Axial Stress Calculator
Check average axial stress in a specimen or a bar.
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Engineering & calculations
Small Angle Pendulum Period Calculator
Check a simple pendulum period for basic gravity and vibration experiments.
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Engineering & calculations
Mass Spring Natural Frequency Calculator
Check the undamped natural frequency of a linear vibration model.
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Engineering & calculations
Centripetal Acceleration Calculator
Check the normal acceleration component in a circular-motion experiment.
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Engineering & calculations
Shaft Torque Power Calculator
Check mechanical shaft power from signed torque and rotation speed.
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Engineering & calculations
Rotational Kinetic Energy Calculator
Check stored rotation energy in a flywheel or a rigid rotor.
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Engineering & calculations
Power Gain in Decibels Calculator
Check a power ratio for an amplifier or a link loss budget.
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Engineering & calculations
Unloaded Voltage Divider Calculator
Check an ideal resistive divider before connecting an ADC or sensor load.
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Engineering & calculations
LC Resonance Frequency Calculator
Check the ideal resonance frequency for a filter or resonance experiment.
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Engineering & calculations
Inductive Reactance Calculator
Check ideal inductive reactance at a chosen sinusoidal frequency.
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Engineering & calculations
Capacitive Reactance Calculator
Check the magnitude of ideal capacitor reactance at a sinusoidal frequency.
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Engineering & calculations
RL Time Constant Calculator
Check the current response time constant of a first-order coil circuit.
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Engineering & calculations
RC Time Constant Calculator
Check the time constant of a first-order charging or filter circuit.
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Engineering & calculations
Long Air Core Solenoid Calculator
Check an initial inductance estimate for a long air core coil.
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Engineering & calculations
Parallel Plate Capacitance Calculator
Check ideal capacitance for a sensor or a dielectric experiment.
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Engineering & calculations
Wire DC Resistance Calculator
Check conductor resistance from resistivity, length and cross-sectional area.
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Engineering & calculations
Carnot Refrigerator COP Calculator
Check the ideal refrigeration coefficient of performance between two reservoirs.
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Engineering & calculations
Carnot Efficiency Limit Calculator
Check the theoretical efficiency limit for a heat engine between two reservoirs.
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Engineering & calculations
Linear Thermal Expansion Calculator
Check free length change in a metal rod or an assembly clearance.
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Engineering & calculations
Net Radiation Heat Transfer Calculator
Check radiative heat loss between a small gray surface and large surroundings.
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Engineering & calculations
Surface Convection Calculator
Apply Newton's law of cooling to a surface with a known convection coefficient.
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Engineering & calculations
Plane Wall Conduction Calculator
Check heat conduction through a wall or insulation specimen.
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Engineering & calculations
Drag Force Calculator
Check a drag load using a known wind-tunnel drag coefficient.
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Engineering & calculations
Kinematic Viscosity Calculator
Convert dynamic viscosity to kinematic viscosity without mixing their units.
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Engineering & calculations
Hydraulic Pressure Power Calculator
Check the rate of pressure work from pressure rise and flow rate.
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Engineering & calculations
Laminar Pipe Pressure Drop Calculator
Check Hagen–Poiseuille pressure loss in microchannels and laminar-flow experiments.
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Engineering & calculations
Hydrostatic Gauge Pressure Calculator
Check liquid-column pressure in tanks and hydrostatic experiments.
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Engineering & calculations
Mass Flow Rate Calculator
Convert volumetric flow to mass flow for gas supply and material balances.
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Engineering & calculations
Volume Flow Rate Calculator
Check flow through a pipe or ventilation opening using its cross-sectional area.
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Engineering & calculations
Dynamic Pressure Calculator
Check dynamic pressure before estimating wind-tunnel loads and coefficients.
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Engineering & calculations
Mach Number Calculator
Compare flow speed with the local speed of sound in wind tunnels and nozzles.
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Engineering & calculations
Reynolds Number Calculator
Check flow similarity in pipe experiments and scale models.
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Fun & life
Put All Six Cats to Sleep
Find sleeping places that satisfy the preferences of all six picky cats.
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Fun & life
Copy the Line from Memory
Memorize a line for two seconds and redraw it at the same length.
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Fun & life
100 Points for Your Next Life
Allocate 100 points for your next life and discover your personal result.
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Fun & life
Repeat the Rain Rhythm
Remember the rhythm of raindrops you just heard and repeat it.
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Fun & life
Mental Lunch Math
Calculate lunch bills without a calculator to test mental speed and accuracy.
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Fun & life
Three-Second Table Memory
Look at a table for three seconds, then reproduce the arrangement of its objects.
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Fun & life
Can You Feel Ten Seconds?
Estimate ten seconds three times without watching a clock to test your sense of time.
Web appOpen app
Fun & life
Rebirth Life ID
What organism will you become? Discover 72 possible next lives based on Earth’s biomass, with your own life ID.
Web appOpen app
AI & development
AI Knowledge Tree
Commissioned by a large corporation, this app helps anyone see the current state of the AI industry at a glance.
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Fun & life
Rebirth Passport
Where will you be born next? Discover a new country and passport based on world population shares.
Web appOpen app
AI & development
Astra Playground
Practice AI agents with exercise sites and example files in one place.
Web appOpen app
AI & development
Published Prompt Portal
Browse prompts collected from published books.
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AI & development
Android WebView Template
Edit a configuration file to turn a website into an Android app.
Development templateView template
Everyday & work
Away Screen
Display your current status while you are away or in a meeting.
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Documents & text
Document Summarizer
A tool to help you read long documents and organize their main points.
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Documents & text
Dummy Text Generator
Generate sample text for design layouts and document drafts.
Web appOpen app
Documents & text
Document Analyzer
Inspect page counts, word counts and other PDF and DOCX document information.
Web appOpen app
Documents & text
Character Counter
Check Korean character counts and bytes to measure the length of your writing.
Web appOpen app
Fun & life
Today’s Fortune
See what today might bring with a lighthearted fortune reading.
Web appOpen app
Images & media
Video to GIF
Select a moment from a video and turn it into an animated GIF.
Web appOpen app
Images & media
Image Resizer
Resize images, change their proportions and crop the parts you need.
Web appOpen app
Documents & text
Document Compressor
Reduce the size of PDF files, office documents and images.
Web appOpen app
Everyday & work
Smart Calculator
Everyday calculations and currency conversion, with voice input and calculation history.
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