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Electrical And Other Maintenance Formulae

In the construction and maintenance business, having the right equipment to do the job is vital. Having the right knowledge is just as important. We have listed some of the most requested formulae below. If there are others you want to have posted, please contact us.

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
Other Useful Formulae

    BTUs x 777.5 = foot pounds
    BTUs x 3.93 ÷ 10,000 = horsepower hours
    BTUs x 2.93 ÷ 10,000 = Kilowatt hours
    BTUs per minute x 13.0 = foot pounds per second
    BTUs per minute x 1.76 ÷ 100 = Kilowatts
    BTUs per hour x 2.93 ÷ 10,000 = Kilowatts
    BTUs per hour x 2.98 ÷ 1,000,000 = Boiler horsepower
    (Celsius x 9 ÷ 5) + 32 = Fahrenheit
    Circular mils x 0.7854 = Square mils
    (Fahrenheit - 32) x 5 ÷ 9 = Celsius
    Foot pounds x 2.29 ÷ 1,000 = BTUs
    Foot pounds x 5.05 ÷ 10,000,000 = Horsepower hours
    Foot pounds x 3.77 ÷ 10,000,000 = Kilowatt hours
    Foot pounds per minute x 1.29 ÷ 1,000 = BTUs per minute
    Foot pounds per minute x 3.03 ÷ 100,000 = Horsepower
    Foot pounds per second x 1.82 ÷ 1,000 = Horsepower
    Horsepower x 42.4 = BTUs per minute
    Horsepower x 33,000 = Foot pounds per minute
    Horsepower x 550 = Foot pounds per second
    Horsepower x 0.746 = Kilowatts
    Horsepower boiler x 33520 = BTUs per hour
    Horsepower boiler x 9.80 = Kilowatts
    Horsepower hours x 2550 = BTUs
    Horsepower hours x 1,980,000 = Foot pounds
    Kilowatts x 56.9 = BTUs per minute
    Kilowatts x 3412 = BTUs per hour
    Kilowatts x 1.341 = Horsepower
    Kilowatt hours x 3412 = BTUs
    Kilowatt hours x 1.34 = Horsepower hours
    Square inch x 273,000 = Circular mils
Version 1.0.1


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