Geared motor speed & torque
Estimate gearbox output speed and torque from motor power, ratio and efficiency. This does not select a gearbox.
Enable JavaScript for live calculations. Read the method and default example below.
Method and assumptions
- n₂ = n₁ / ratio; T₂ = 9550 × output kW / output rpm.
- Service factor increases the required gearbox rating, not available torque.
Before using the result
- Verify thermal capacity, peak torque, shock, mounting and shaft loads with the manufacturer.
Worked example
Illustrative default inputs. Enter your project values above.
- Motor shaft power
- 4 kW
- Motor speed
- 1500 rpm
- Reduction ratio
- 30 :1
- Gear efficiency
- 90 %
- Service factor assumption
- 1.5
Default results
- Output speed
- 50 rpm
- Output torque
- 687.6 Nm
- Rated torque requirement
- 1,031.4 Nm
Choose a reference or send your BOQ
Compare relevant product families, then confirm the exact rating, control supply and duty. Price and availability are confirmed with your enquiry.
Technical references
These references support planning. The exact model documentation and a project-specific engineering review govern the final specification.