Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Engineering
Power Transmission Calculator
Converts torque (N·m) and rotational speed (rpm) into mechanical power in kilowatts. Use it when sizing motors, drives, or shafts, or when checking whether a drivetrain can handle a given load without overheating.
Fill in the required fields to see your result.
Engineering
Gear Ratio & Speed Calculator
Calculates the output speed of a two-gear meshing pair given the driver and driven tooth counts and the input speed. Use it when selecting gear pairs for motors, gearboxes, or power-transmission drives. (For output torque, multiply input torque by the gear ratio R = drivenTeeth / driverTeeth and by mesh efficiency — see the explanation below.)
Fill in the required fields to see your result.
Key differences
| Power Transmission Calculator | Gear Ratio & Speed Calculator | |
|---|---|---|
| Category | Engineering | Engineering |
| Inputs required | 2 | 3 |
| Result | Power (kW) | Output Speed (RPM) |
| What it does | Converts torque (N·m) and rotational speed (rpm) into mechanical power in kilowatts. Use it when sizing motors, drives, or shafts, or when checking whether a drivetrain can handle a given load without overheating. | Calculates the output speed of a two-gear meshing pair given the driver and driven tooth counts and the input speed. Use it when selecting gear pairs for motors, gearboxes, or power-transmission drives. (For output torque, multiply input torque by the gear ratio R = drivenTeeth / driverTeeth and by mesh efficiency — see the explanation below.) |