Hydraulic pump flow calculator

Pump output flow from displacement, speed and volumetric efficiency.

Calculating…

How it's calculated

Q [L/min] = Vg [cc/rev] × n [rpm] × ηv ÷ 1000

Volumetric efficiency is typically 85–95% for gear pumps and 90–97% for piston pumps, and falls as pumps wear. Measured flow well below the calculated value at working pressure is a classic sign of a worn pump.