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As a service to you, below are some of the more common electrical formulas. Feel free to print this page out for your convenience.   • Power Calculator
TO FIND SINGLE-PHASE THREE-PHASE DIRECT CURRENT
Kilowatts I x E x PF
1000		 I x E x 1.732 x PF
1000		   I x E  
1000
KVA I x E
1000		 I x E x 1.732
1000		 ---------------
Horsepower (Output) I x E x %EFF x PF
746		 I x E x 1.732 x %EFF x PF
746		 I x E x %EFF
746
Amperes when Horsepower is known       HP x 746      
E x %EFF x PF		            HP x 746           
1.732 x E x %EFF x PF		   HP x 746  
E x %EFF
Amperes when Kilowatts is known   KW x 1000  
E x PF		     KW x 1000    
1.732 x E x PF		   KW x 1000  
E
Amperes when KVA is known KVA x 1000
E		 KVA x 1000
1.732 x E		 ---------------
E = Volts I = Amperes %EFF = Percent Efficiency PF = Power Factor
Useful Conversions  
  •  
    Length 1 in     =  25.4 mm  =  2.54 cm
    1 m     =  39.37 in
    1 cm    =  0.3937 in
    Area 1 ft2  =  0.0929 m2              
    1 in2  =  645 mm2
    Mass   1 lb   =  0.45359 kilogram (kg)
    Volume 1 in3 =  0.0163871 Liter (L)  = 16.4 mL
    1 ft3  =  7.48055 gal = 28.317 L =  0.028317 m3           
    1 gal  =  3.7854 L    = 0.0037854 m3*
    Energy  1 ft-lb    =  1.3558 joules (J)
    1 calorie =  4.184 J
    1 Btu     =  1.05435 kJ
     Btu/hr    =  cfm  x  T in F  x 1.10 (air)
     Btu/hr    =  gpm x  T in F  x 500.4 (water)
    Density  1 lb/ft3 =  16.018463 kg/m3
    1 lb/gal  =  119.827 kg/m3
    Temperature F = 1.8C + 32
    C = (F - 32) / 1.8
    Pressure  1 psi = 6.8948 kilo-Pascals (kPa)
    1 bar  100 kPa = 14.504 psi 
    1 in of Hg (60F) = 3.38 kPa 
    1 in of H2O (60F) = 249 Pa
    1 ft of H2O = 2.99 kPa* 
    Flow  1 cfm = 0.472 L/s    =  0.000472 m3/s
    1 gpm = 0.0631 L/s  =  0.0000631 m3/s
    Velocity 1 fpm = 0.00508 m/s
    Wire gauge Square inch x 273,000 = Circular mils

 

     

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