Fluid Pressure =	Force (Pounds) Unit Area (Square Inches)
Fluid Flow Rate=	Volume (Gallons) Unit Time (Minute)
Fluid Power in Horsepower =	Pressure (PSI) x Flow (GPM) 1714

U.S. Gear Drive Formulas
Torque (in-lb) =	hp x 63025 / rpm
Horsepower (hp)=	in-lb x rpm / 63025
Pitch Dia=	Teeth / Diametral Pitch
Thermal input (Watts) =	hp x (1 - eff) x 745.7
Output Torque =	Input Torque x Ratio x Gear Drive Efficiency
Output rpm =	Input rpm / Ratio
Metric Gear Drive Formulas
Nm =	kW x 46326.77 RPM
kW =	Nm x RPM 46326.77
Thermal input (Watts) =	kW x (1-eff) 556.08
Output TQ =	Input TQ x Ratio x Gear Drive Efficiency
Output rpm =	Input rpm / Ratio
Back to Top U.S. Motor Formulas
hp =	gpm x psi / 1714
hp =	in-lb x rpm / 63025
in³ =	(in-lb x 6.283) / (psi x eff)
in-lb =	psi x in³ x eff / 6.283
in-lb =	hp x 63025 / rpm
gpm =	rpm x in³ / 231
rpm =	gpm x 231 / in³
eff =	(in-lb x 6.283) / (psi x in³)
in-lb =	gpm x psi x eff x 36.77 / rpm
psi =	(in-lb x 6.283) / (in³x eff)
Back to Top Metric Motor Formulas
kW =	L/min x bar / 70148.25
kW =	Nm x rpm / 46326.77
cm³=	(Nm x 170.7) / (bar x eff)
Nm =	bar x cm³ x eff / 170.7
Nm =	kW x 46326.77 / rpm
L/min =	rpm x cm³ / 125.25
rpm =	L/min x 125.25 / cm³
eff =	(Nm x 170.7) / (bar x cm³)
Back to Top Pump Formulas
Pump Outlet Flow =	RPM x Pump Displacement (Cu. In./Rev.) 231
Pump Input Power in Horsepower =	Flow Rate Output (GPM) x Pressure (PSI) 1714 x Efficiency (Overall)
Overall Efficiency =		Output Horsepower Input Horsepower	x 100
Overall Efficiency =	Volumetric Eff. x Mechanical Eff.
Volumetric Efficiency =	Actual Flow Rate Output (GPM) Theoretical Flow Rate Output (GPM)		x 100
Mechanical Efficiency =	Theoretical Torque to Drive Actual Torque to Drive		x 100
Back to Top Metric to U.S. Conversion
kW =	1.341 hp
bar =	14.5 psi
Nm =	8.8496 in-lb
daNm =	88.496 in-lb
kg-m =	86.796 in-lb
L/min =	.2642 gpm
cm³ =	.061 in³
L =	2.114 Pints
C° =	(F° - 32) / 1.8

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