Electrical Formulae for Calculating Amps, Horsepower, Kilowatts, & KVA
Use the chart in this calculation guide to find the formula you need according to the measure you will calculate.
HP x 746 E x EFF |
HP x 746 E x EFF x PF |
HP x 746 2 x E x EFF x PF |
HP x 746 E x EFF x PF x 1.73 |
|
KW x 1000 E |
KW x 1000 E x PF |
KW x 1000 2 x E x PF |
KW x 1000 E x PF x 1.73 |
|
|
KVA x 1000 E |
KVA x 1000 2 x E |
KVA x 1000 E x 1.73 |
|
E x I 1000 |
E x I x PF 1000 |
I x E x 2 x PF 1000 |
E x I x 1.73 x PF 1000 |
|
|
I x E 1000 |
I x E x 2 1000 |
E x I x 1.73 1000 |
|
E x I x EFF 746 |
E x I x EFF x PF 746 |
I x E x 2 x EFF x PF 746 |
E x I x EFF x PF x 1.73 746 |
E = Voltage / I = Amps / PF = Power Factor / EFF = Efficiency / HP = Horsepower |
NOTE: Direct Current formulae do not use (PF, 2, or 1.73); Single phase formulas do not use (2 or 1.73); Two phase-four wire formulas do not
use (1.73);
Three phase formulas do not use (2)
* For three-wire, two phase circuits, the current in the common conductor is 1.41 times the current in either of the other two conductors.