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Electrical Formulas for calculating Amperes, Horsepower, Kilowatts and KVA

E = Voltage / I = Amps/ PF = Power Factor / EFF = Efficiency / HP = Horsepower
To Find	Direct Current	Alternating Current
To Find	Direct Current	Single Phase	Two-Phase* Four-Wire	Three Phase
Amperes when Horsepower is known	HP x 746 --------------- E x EFF	HP x 746 ---------------- E x EFF x PF x 2	HP x 746 --------------------------- 2 x E x EFF x PF	HP x 746 ------------------ E x EFF x PF x 1.73
Amperes when Kilowatts are known	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
Amperes when "KVA" is known		KVA x 1000 ------------------- E	KVA x 1000 --------------------- 2 x E	KVA x 1000 ---------------------- E x 1.73
Kilowatts	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
Kilovolt-Amperes "KVA"-		I x E ------------- 1000	I x E x 2 ------------------------ 1000	E x I x 1.73 -------------------- 1000
-Horsepower (Output)	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

Note: Direct current formulas 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 that in either of the other two conductors.