Hydraulic Cylinder Calculator - SI units

mm
mm
mm
L/min
Supply flow is assumed into the pressurised port. Calculator gives velocity, full-stroke time, and return outflow for extension and retraction.
Extension = pump into bore, return from rod. Retraction = pump into rod, return from bore.
A_b = π·D²/4, A_r = π·(D² − d²)/4, ratio = A_b/A_r. V = A·stroke, F = P·A, v = Q/A_active, t = stroke/v, Q_out = v·A_passive.

Results

Geometry

Bore side Rod side Unit
Area
Volume (full stroke)
Area ratio

Performance at given pressure and flow

Extension
P into bore, return from rod		 Retraction
P into rod, return from bore		 Unit
Force
Time, full stroke
Velocity
Return outflow
Always from the opposite port
from rod port (extension)
from bore port (retraction)
 L/min