Torque Converter Calculator

Calculate torque converter stall ratio, efficiency, and coupling point for automotive and industrial applications.

Engine output torque at converter input.
N·m
Engine RPM at the operating point.
rpm
Torque multiplication at stall. Typical: 1.8-2.5.
Output/input speed ratio. 0 = stall, 1 = coupling.
Output (turbine) shaft speed.
rpm

Results

Turbine (Output) Torque-N·m
Input Power-kW
Output Power-kW
Converter Efficiency-%
Torque Ratio at SR-
References: SAE — Torque Converters; Lechner — Automotive Transmissions