Step 1
Convert power to shaft torque
Use known mechanical power and shaft RPM to estimate the corresponding running torque at that shaft.
Open Torque from PowerCalculator cluster
Power, Torque & Speed Calculators
Convert between mechanical power, shaft torque, rotational speed, force, and lever radius for workshop and drivetrain calculations.
6 calculators in this cluster
Power, torque, rotational speed, tangential force, and effective radius are linked by a small set of mechanical relationships. These calculators let you solve the same relationship from different known quantities without repeatedly converting between SI and imperial units by hand.
Results are ideal mechanical values at the point where the entered quantities apply. When values come from different points in a drivetrain, account for efficiency, ratio, and measurement location before comparing them directly.
A practical calculation workflow
Step 2
Convert torque to tangential force
Use an effective pulley, drum, sprocket, or lever radius to turn shaft torque into ideal tangential force.
Open Force from TorqueStep 3
Close the loop
When torque and RPM are known, calculate mechanical power as a consistency check against the source or load rating.
Open Power from TorqueAll Power, Torque & Speed calculators
Choose the variable you know and the quantity you need to solve. Each tool shows its formula, default worked example, and nearby calculations.
Torque from Power and RPM Calculator
Calculate shaft torque from mechanical power and rotational speed.
Power from Torque and RPM Calculator
Calculate mechanical shaft power from torque and rotational speed.
RPM from Power and Torque Calculator
Calculate rotational speed from mechanical power and shaft torque.
Torque from Force and Radius Calculator
Calculate torque from tangential force and lever-arm radius with metric and imperial outputs.
Force from Torque and Radius Calculator
Calculate tangential force from shaft torque and effective radius with metric and imperial results.
Radius from Torque and Force Calculator
Calculate the effective lever radius required to produce a target tangential force from a known torque.
Practical notes
- Use mechanical shaft power, not electrical input power, unless motor efficiency is explicitly included.
- Torque and force must refer to the same shaft and effective radius for a direct conversion.
- Starting, peak, or stall conditions can differ substantially from continuous running values.