Hydraulic Sizing Calculators

Pump flow

How do I calculate hydraulic pump flow?

Q [L/min] = V [cc/rev] × n [rpm] / 1000

Pump sizing

How do I size the required pump displacement?

V [cc/rev] = Q [L/min] × 1000 / n [rpm]

Motor torque

How do I calculate hydraulic motor torque?

T [N·m] = V [cc/rev] × ΔP [bar] / 20π

Motor sizing

How do I size the required motor displacement?

V [cc/rev] = T [N·m] × 20π / ΔP [bar]

Cylinder force

How do I calculate hydraulic cylinder force?

F [kN] = P [bar] × π × D² / 40000 (D: mm)

Cylinder sizing

How do I size the required cylinder bore?

D [mm] = √( 4F / πP ) × 1000 (F: kN→N, P: bar→Pa)

Cooler capacity

How do I size an oil cooler (heat rejection)?

Φ [kW] = Q [L/min] × ΔP [bar] × (1−η) / 600

Motor power

How do I calculate the electric motor power for a power unit?

P [kW] = Q [L/min] × ΔP [bar] / (600 × η)