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💧 Hydraulic Calculator

Calculate cylinder force, flow rates, pump sizing, and hydraulic system parameters for heavy equipment

Cylinder Force Calculator

Calculate the push and pull force of a hydraulic cylinder based on bore size, rod diameter, and system pressure.

inches
inches
PSI
inches
Results
Formulas Used
Push Force = Bore Area × Pressure
Pull Force = (Bore Area - Rod Area) × Pressure
Area = π × (diameter/2)²

Flow Rate Calculator

Calculate the flow rate required for a desired cylinder speed, or determine speed from available flow.

inches
inches
in/sec
Results
Formula Used
GPM = (Area × Speed × 60) / 231
Where: Area in sq.in, Speed in in/sec

Pump Sizing Calculator

Calculate required pump displacement, motor horsepower, and hydraulic power based on flow and pressure requirements.

GPM
PSI
RPM
%
Results
Formulas Used
Displacement = (GPM × 231) / RPM
Hydraulic HP = (GPM × PSI) / 1714
Input HP = Hydraulic HP / Efficiency

Pipe/Hose Velocity Calculator

Calculate fluid velocity in pipes and hoses. Check if velocity is within recommended limits for pressure and return lines.

GPM
inches
Results
Formula Used
Velocity (ft/sec) = (GPM × 0.3208) / Area
Area = π × (ID/2)²

Pressure Drop Calculator

Estimate pressure drop in hydraulic lines based on flow, length, diameter, and fluid viscosity.

GPM
inches
feet
SSU
Results
Formula Used (Simplified)
ΔP = (0.000273 × SSU × L × GPM) / (ID⁴)
Where: L=length(ft), ID=diameter(in)

Quick Reference

Recommended Velocities

  • Pressure Lines 10-15 ft/sec
  • Return Lines 5-10 ft/sec
  • Suction Lines 2-4 ft/sec

Common Pressures

  • Light Duty 1000-1500 PSI
  • Medium Duty 2000-2500 PSI
  • Heavy Duty 3000-5000 PSI

Hydraulic Oil Viscosity

  • ISO 32 (light) ~150 SSU
  • ISO 46 (medium) ~215 SSU
  • ISO 68 (heavy) ~315 SSU

Conversions

  • 1 gallon 231 cubic inches
  • 1 HP 1714 PSI × GPM
  • 1 bar 14.5 PSI