Free calculator, no sign-up
Gearbox calculator: output torque, output speed, efficiency
Output speed and torque of a gearbox from motor power, speed, overall ratio and stage efficiency, with a warning for worm gears. Free, no sign-up.
- Instant result
- Formula and standards shown
- On desktop and phone
Result
98.11N·mInput torque
- Output speed
- 73.0rpm
- Output torque
- 1,846.2N·m
- Output power
- 14.11 kW
- Overall efficiency
- 0.9409
Free during the beta, no credit card
Gearbox figures attached to the replacement work order
Here, the calculator is free and the result is gone when you close the page. In Reglova, it is attached to the work order on the right machine: you find it again at the next breakdown, and on audit day.
The CMMS software comparison, our gaps included- Attached to the work order with its inputs: the server recalculates it, it stays verifiable.
- On the technician's phone, even without a network.
- In the machine's history, for the next breakdown.
- The asset's nameplate data pre-fills the calculation.
When to calculate gearbox output torque
01
Check that a replacement gearbox can take the output torque.
02
Compare a helical gearbox and a worm gearbox for the same ratio.
03
Size a coupling or a torque limiter on the output shaft.
Good to know
The ratio to enter is the gearbox's overall ratio. The calculated output torque is nominal: the manufacturer's service factor comes on top for frequent starts or shocks.
Gearbox torque formula and overall efficiency
The calculator starts from the motor power and speed to give the input torque, then applies the reduction ratio and the efficiency of each stage: output speed, torque and power, overall efficiency. For a worm gear, it flags an over-optimistic efficiency.
Formula · Reference documents
T = 60,000/(2π)·P/n ; n2 = n1/i ; T2 = T1·i·η ; P2 = P1·η ; overall η = Π ηk
General mechanics
Inputs and accepted ranges
| Input | Unit | Accepted range | Example |
|---|---|---|---|
| Power | kW | 0.001 to 100,000 | 15 kW |
| Input speed | rpm | 0.1 to 100,000 | 1,460 rpm |
| Reduction ratio i | 0.01 to 10,000 | 20 | |
| Efficiency per stage η | 0.01 to 1 | 0.97 | |
| Number of stages | 1 to 10 | 2 | |
| Gearing | 2 options | Gears |
Calculated results
- Input torqueN·m
- Output speedrpm
- Output torqueN·m
- Output powerkW
- Overall efficiency
What the calculator flags
- Efficiency above 0.9 for a worm gear: optimistic value.
Gearbox nameplate data stored with the asset
- Breakdowns reported by QR code
- Work orders on the phone, even without a network
- Mandatory inspections reminded by email
- Audit file as a PDF, in one click
Free during the beta, no credit card