ONE FORMULA, ONE ANSWER
Nusselt Number Calculator
Convert a known convection coefficient to a Nusselt number. Choose input units and calculate one value within the stated conditions.
Inputs
Calculations run in this browser. Scientific notation such as 1.2e-3 is supported. Do not group thousands.
Result
Nusselt number Nu
Enter values and select Calculate.
Nu = hL/k_f
Assumptions
Required: h,L,k_f>0. k_f is the fluid conductivity, not wall conductivity. Match local or mean h and the chosen characteristic length. h is not inferred from a correlation.
Displayed values are floating-point approximations. Design safety factors and unprovided error contributions are not calculated.
Formula references and credits
NaNa Lab created the code, descriptions, icons and preview images. Text, figures and code from the linked references have not been reproduced.
Physical constants: NIST / CODATA 2022. The values of μ₀ and ε₀ are measured recommendations, not exact defining constants. Values and precision notes are in the source record.
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