TDR Tools
Gear ratio calculator
Simple pairs, multi-stage trains, planetary sets and belt drives — with rotating mesh animation and full torque/power output.
Ideal kinematics with stage efficiency. Ignore backlash, deflection and dynamic load factors for final sizing.
Drivetrain
Animation speed · 1.0×
Pressure angle α · 20°
Inputs
Presets
Driver teeth Z₁
Driven teeth Z₂
Mesh
Module m (mm)
Efficiency · 98%
Input speed (rpm)
Input torque (N·m)
Results
Ratio
1 : 3
Reduction · i = 3
Output speed
-500rpm
Output torque (net)
29.4N·m
(≈ 3 kgf·m)
Output torque (theo.)
30N·m
Efficiency
98%
Input power
1.57kW
Output power
1.54kW
- Pitch Ø driver
- 40 mm
- Pitch Ø driven
- 120 mm
- Center distance
- 80 mm
Formulas
i = Z₂ / Z₁ n₂ = n₁ / i (external mesh reverses rotation)
T_out ≈ T_in × |i| × η P = T × ω
Need motion hardware that matches these numbers?
Explore the TDR lineup or talk to applications engineering.