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Pressure
PSI X 27.68 = Inches of H2O
PSI X 2.307 = Feet of H2O
PSI X 2.036 = Inches of Mercury
PSI X 6.895 = Pa = n/m2
PSI X 6.895 = Kpa
PSI X 6.895 = Millbar
PSI = BAR X 14.5
PSI = KG/m2 X .001422 
Formulae
HHP = (GPM x PSI) / 1714
HHP = (BPH x PSI) / 2450
BHP = (GPM x PSI) / (1714 x ME)
Flow Rate
GPM x 34.29 = BPD
GPM x 1.429 = BPH
GPM x 8021 = ft3/hr
GPM = BPD x .0292 
Plunger Pump Fundamentals
Pressure = Rod Load / Plunger Area
Gallon Per Rev = Plg Area x Stroke x Number Cyl / 231
Horsepower = GPM x PSI/ 1714 (M.E.) 
Centrifugal Pump Fundamentals
Head in feet = PSI x 2.31 / S.G.
Pressure = TDH x S.G. / 2.31
BHP = GPM x TDH x S.G. / 3960 x PUMP Eff.  

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