ONE FORMULA, ONE ANSWER
Shaft Torque Power Calculator
Check mechanical shaft power from signed torque and rotation speed. 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
Mechanical shaft power P
Enter values and select Calculate.
P = T ω, ω = 2π n / 60 (n: rpm)
Assumptions
Choose a positive direction on the same shaft for torque and angular velocity. Matching signs give positive transferred power; opposite signs give negative power. This is not electrical input power. Motor efficiency and starting peaks are excluded.
Displayed values are floating-point approximations. Measurement uncertainty and design safety factors 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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