 # 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 = P = or psi = Fluid Flow Rate

In Gallons/Minute
Flow Rate = Q = Fluid Power

In Horsepower
Horsepower = HP = ## Pump Formulas

Formula ForWord FormulaLetter Formula
Pump Outlet Flow

In Gallons/Minute
Flow = Q = Pump Input Power

In Horsepower Required
Horsepower Input = HPIN = or Pump Efficiency

Overall in Percent
Overall Efficiency = X 100

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

EffQV = EffVOL x EffMECH
Pump Efficiency

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

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

B10 Bearing Life
B10 Hours of Bearing Life = Rated Life Hours x x B10 x x ## Cylinder Formulas

Formula ForWord FormulaLetter Formula
Cylinder Area

In Square Inches
Area = x Radius2 (Inches)

Area = x Diameter2 (Inches)
A = r2

A = 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 = V = or V = Cylinder Volume Capacity

In Gallons of Fluid
Velocity = Velocity = V = V = / = Length of Stroke
Cylinder Flow Rate

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

In Inch Pounds
Torque = Torque = Torque = T = or T = T = T = or T = Fluid Motor Torque/100 psi

In Inch Pounds
Torque/100 psi = T100psi = Fluid Motor Speed

In Revolutions/Minute
Speed = n = Fluid Motor Power

In Horsepower Output
Horsepower = HP = ## 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