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Hydraulic Product Calculator

Calculate specifications for your Hydraulic requirements using our Hydraulics products selector table

The following formulas are to be a guideline only and are not to be used for actual design of a hydraulic system.

Basic Formulas

Formula ForWord FormulaLetter Formula
Fluid Pressure

In Pounds/Square Inch
Pressure = Fluid PressureP = Fluid Pressure or psi = Fluid Pressure
Fluid Flow Rate

In Gallons/Minute
Flow Rate = Fluid Flow RateQ = Fluid Flow Rate
Fluid Power

In Horsepower
Horsepower = Fluid PowerHP = Fluid Power

Pump Formulas

Formula ForWord FormulaLetter Formula
Pump Outlet Flow

In Gallons/Minute
Flow = FlowQ = Flow
Pump Input Power

In Horsepower Required
Horsepower Input = Horsepower InputHPIN = Horsepower Input or horsepower_input
Pump Efficiency

Overall in Percent
Overall Efficiency = overall_efficiency X 100

Overall Efficiency = Volumetric Eff. x Mechanical Eff.
EffQV = overall_efficiency x  100

EffQV = EffVOL x EffMECH
Pump Efficiency

Overall in Percent
Volumetric Efficiency = Volumetric Efficiency x 100EffVOL = Volumetric Efficiency x 100
Pump Efficiency

Mechanical in Percent
Mechanical Efficiency = Mechanical Efficiency x 100EffMEC = Mechanical Efficiency x 100
Pump Life

B10 Bearing Life
B10 Hours of Bearing Life = Rated Life Hours x Pump Life x Pump LifeB10 x Pump Life x Pump Life

Cylinder Formulas

Formula ForWord FormulaLetter Formula
Cylinder Area

In Square Inches
Area = pi x Radius2 (Inches)

Area = Cylinder Area x Diameter2 (Inches)
A = pir2

A = Cylinder Area or A = .785D2
Cylinder Force

In Pounds, Push or Pull
Force = Pressure (psi) x Net Area (Square Inches)F = psi x A or F = PA
Cylinder Velocity or Speed

n Feet/Second
Velocity = Cylinder VelocityV = Cylinder Velocity or V = Cylinder Velocity
Cylinder Volume Capacity

In Gallons of Fluid
Velocity = cylinder_volume_capacity

Velocity = cylinder_volume_capacity
V = cylinder_volume_capacity

V = cylinder_volume_capacity   / = Length of Stroke
Cylinder Flow Rate

In Gallons Per Minute
Flow Rate = Cylinder Flow RateQ = Cylinder Flow Rate or  Q = 3.117vA
Fluid Motor Torque

In Inch Pounds
Torque = Fluid Motor Torque

Torque = Fluid Motor Torque

Torque = Fluid Motor Torque
T = Fluid Motor Torqueor T = Fluid Motor Torque

T = Fluid Motor Torque

T = Fluid Motor Torque or T = Fluid Motor Torque
Fluid Motor Torque/100 psi

In Inch Pounds
Torque/100 psi = Fluid Motor Torque/100 psiT100psi = Fluid Motor Torque/100 psi
Fluid Motor Speed

In Revolutions/Minute
Speed = Fluid Motor Speedn = Fluid Motor Speed
Fluid Motor Power

In Horsepower Output
Horsepower = Fluid Motor PowerHP = Fluid Motor Power

Volume & Capacity Equivalents

VolumeCubic InchesCubic FeetCubic YardsLitersU.S. GallonsImperial GallonsWater at Max. Density 39.2ºF 4ºC

Pounds of Water
Water at Max. Density 39.2ºF 4ºC

Kilograms of Water
Cubic Inches1.00000.00057870.000021430.0163840.00432000.00360650.03612750.0163872
Cubic Feet1,728.00001.00000000.0370370028.3170007.48052006.232100062.428300028.3170000
Cubic Yards46,656.000027.00000001.00000000764.560000201.9740000168.26600001,685.5600000764.5590000
Liters61.02340.0353140.001308001.0000000.26417000.22008302.20462001.0000000
U.S. Gallons231.00000.13368100.004951003.7854301.00000000.83311108.34545003.7854300
Imperial Gallons277.27400.16054900.005942904.5437401.20032001.000000010.01720004.5437300
Lbs Water27.67980.01601840.000592900.4535920.11982500.09982811.00000000.4535930
To ConvertIntoMultiply By
BarPsi14.5
PsiBar0.069
Cubic CentimetersCubic Inches0.06102
Cubic InchesCubic Centimeters16.39
Cubic InchesGallons0.004329
GallonsCubic Inches231.0
HorsepowerKilowatts0.746
KilowattsHorsepower1.341
Foot PoundsNewton Meters1.356
Newton MetersFoot Pounds0.737
KilogramsPounds2.205
PoundsKilograms0.4536
Imperial GallonsU.S. Gallons1.20
LitersU.S. Gallons0.2642
InchesMillimeters25.40
MillimetersInches0.03937

Conversion Formulas

GPM = (DISP. * RPM) / 231
HP = (FT LBS. * RPM) /5252
HP = (GPM * PSI) / 1714
RPM = (GPM * 231) / DISP.
FT. LBS. = (PSI * DISP.) / 75.36

Independent Hydraulics – Fluid Power Distributor Since 1983