DISCLAIMER NOTE:
THE FOLLOWING FORMULAS ARE TO BE A GUIDELINE ONLY AND ARE NOT TO BE USED FOR ACTUAL DESIGN OF A HYDRAULIC SYSTEM.
HYDRAULIC CALCULATOR
| Basic Formulas | ||
|---|---|---|
| Formula For: | Word Formula | Letter Formula |
| Fluid Pressure In Pounds/Square Inch |
Pressure =  |
P =  or psi = |
| Fluid Fow Rate In Gallons/Minute |
Flow Rate =  |
Q =  |
| Fluid Power In Horsepower |
Horsepower =  |
HP =  |
| Pump Formulas | ||
|---|---|---|
| Formula For: | Word Formula | Letter 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 100 |
EffVOL = x 100 |
| Pump Efficiency Mechanical in Percent |
Mechanical Efficiency = x 100 |
EffMEC = x 100 |
| Pump Life B10 Bearing Life |
B10 Hours of
Bearing Life = Rated Life Hours x  x |
B10 x x |
| Cylinder Formulas | ||
|---|---|---|
| Formula For: | Word Formula | Letter Formula |
| Cylinder Area In Square Inches |
Area =  x
Radius2 (Inches)
Area = |
A = r2
A = |
| 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
= |
| 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 = |
| 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 =  |
x Diameter2 (Inches)
or A = .785D2
/ = Length of Stroke
or T = 
| Volume & Capacity Equivalents | ||||||||
|---|---|---|---|---|---|---|---|---|
| Cubic Inches | Cubic Feet | Cubic Yards | Liters | U.S. Gallons | Imperial Gallons | Water at Max. Density 39.2ºF 4ºC | ||
| Pounds of Water | Kilograms of Water | |||||||
| Cu Inches Cu Feet Cu Yards Liters U.S. Gallons Imp. Gallons Lbs Water |
1.0000 1,728.0000 46,656.0000 61.0234 231.0000 277.2740 27.6798 |
.0005787 1.0000000 27.0000000 .0353145 .1336810 .1605490 .0160184 |
.00002143 .03703700 1.00000000 .00130800 .00495100 .00594290 .00059290 |
.016384 28.317000 764.560000 1.000000 3.785430 4.543740 .453592 |
.0043200 7.4805200 201.9740000 .2641700 1.0000000 1.2003200 .1198250 |
.0036065 6.2321000 168.2660000 .2200830 .8331110 1.0000000 .0998281 |
.0361275 62.4283000 1,685.5600000 2.2046200 8.3454500 10.0172000 1.0000000 |
.0163872 28.3170000 764.5590000 1.0000000 3.7854300 4.5437300 .4535930 |
| CONVERSION FACTORS | ||||||||
|---|---|---|---|---|---|---|---|---|
| TO CONVERT | INTO | MULTIPLY BY | ||||||
| BAR | PSI | 14.5 | ||||||
| PSI | BAR | 0.069 | ||||||
| CUBIC CENTIMETERS | CUBIC INCHES | 0.06102 | ||||||
| CUBIC INCHES | CUBIC CENTIMETERS | 16.39 | ||||||
| CUBIC INCHES | GALLONS | 0.004329 | ||||||
| GALLONS | CUBIC INCHES | 231.0 | ||||||
| HORSEPOWER | KILOWATTS | 0.746 | ||||||
| KILOWATTS | HORSEPOWER | 1.341 | ||||||
| FOOT POUNDS | NEWTON METERS | 1.356 | ||||||
| NEWTON METERS | FOOT POUNDS | 0.737 | ||||||
| KILOGRAMS | POUNDS | 2.205 | ||||||
| POUNDS | KILOGRAMS | 0.4536 | ||||||
| IMPERIAL GALLONS | U.S. GALLONS | 1.20 | ||||||
| LITERS | U.S. GALLONS | 0.2642 | ||||||
| INCHES | MILLIMETERS | 25.40 | ||||||
| MILLIMETERS | INCHES | 0.03937 | ||||||
|
GPM = (DISP. * RPM) / 231 HP = (FT LBS. * RPM) /5252 HP = (GPM * PSI) / 1714 RPM = (GPM * 231) / DISP. FT. LBS. = (PSI * DISP.) / 75.36 |
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