Gear Ratio Calculator
Gear ratio, output speed, and output torque — including efficiency factor.
Enter Input Values
Enter the known values — the rest will be calculated automatically.
Formulas
n₂ = n₁ / i
M₂ = M₁ × i × η
P₂ = P₁ × η
n₁/n₂ = Input/output speed [min⁻¹]
M₁/M₂ = Input/output torque [Nm]
η = Efficiency [0–1]
Typical Efficiencies
Note: Efficiency η is entered as a percentage value (e.g. 95 for 95%). For multi-stage gearboxes, individual stage efficiencies are multiplied together.
Notice: The calculation tools provided are intended for initial orientation only and do not replace binding engineering design by qualified specialists. All results must be verified by appropriate engineering calculations before use in safety-critical applications. Technische Antriebselemente GmbH accepts no liability for damages arising from the use of the calculation results.
Matching Products & Guides
Gearboxes from TEA
Worm and bevel gearboxes — find the right model directly using the calculated gear ratio.
ProductDrive Technology Range
Gearboxes, motors, couplings, and freewheels for complete drive solutions from a single source.
Pillar PageDrive Technology Guide
Selection guides, comparisons, and formulas for gearboxes, motors, and couplings.
ComparisonWorm vs. Planetary Gearbox
Efficiency, ratio, and cost in direct comparison — for the right gearbox selection.
CalculatorTorque Calculator
Calculate torque, power, and speed online — free and without registration.
CalculatorMoment of Inertia Calculator
A gearbox of ratio i reduces load inertia quadratically (J/i²) — calculate it for cylinders, discs, ball screws.