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Calculation Result Formula Variables Formula
Torque (lb-in) (((Pressure (lb/in2) * Displacement (in3/rev)) / 6.283185307)
Torque (lb-in) ((Horsepower * 63025) / Speed (rpm))
Torque (lb-in) ((((Flow Rate (gal/min) * Pressure (lb/in2)) / 1714) * 63025) / Speed (rpm))   (36.77071)
Speed (rpm) ((Flow Rate (gal/min) * 231) / Displacement (in3/rev))
Speed (rpm) ((Horsepower * 63025) / Torque (lb-in))
Power (hp) (((Torque (lb-in) * Speed (rpm)) / 63025)
Power (hp) ((Flow Rate (gal/min) * Pressure (lb/in2)) / 1714)
Flow Rate (gal/min) ((Speed (rpm) * Displacement (in3/rev)) / 231)
Flow Rate (gal/min) (Power (hp) * 1714) / Pressure (lb/in2))
Flow Rate (gal/min) ((Speed (rpm) * (((Torque (lb-in) * 6.283185307) / Pressure (lb/in2))) / 231)
Displacement (in3/rev) (((Torque (lb-in) * 6.283185307) / Pressure (lb/in2))
Displacement (in3/rev) ((Flow Rate (gal/min) * 231) / Speed (rpm))
Pressure (psi) (Power (hp) * 1714) / Flow Rate (gal/min))
Pressure (psi) (((Torque (lb-in) * 6.283185307) / Displacement (in3/rev))

Disclaimer.   These calculations are suggestions only.  Always consult a certified engineer for your specific application.