How to use the power, torque and rpm calculator
Convert engine power and rotation speed into torque in newton-metres and pound-feet. Enter power, speed in the fields above; the torque are computed instantly and plotted on the chart so you can see how the answer changes.
Common searches this calculator answers include “engine torque from horsepower”, “torque at rpm”, “kW to torque”, “calculate power, torque and rpm”, “find torque”.
Formula
Variables
- P — Power (kW)
- N — Speed (rpm)
Worked example
With power = 100 kW, speed = 5000 rpm, the calculator gives torque ≈ 190.9859 N·m; torque ≈ 140.864 lb·ft.
Frequently asked questions
What is the power, torque and rpm calculator used for?
Convert engine power and rotation speed into torque in newton-metres and pound-feet. It helps with questions such as “engine torque from horsepower”, “torque at rpm”, “kW to torque”.
What is the formula for the power, torque and rpm calculation?
Torque (N·m) = P × 1000 × 60 / (2 × π × N). Torque (lb·ft) = [Torque] × 0.737562. Here P is power (kW), N is speed (rpm).
What inputs do I need for the power, torque and rpm calculator?
You need power in kW, speed in rpm. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use the power, torque and rpm calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the power, torque and rpm result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.