Key

kVAKilo Volt Amperes

kWKiloWatts

IAmpere

EVolts

PFPower Factor

%EFFPercent Efficiency

HPHorse Power

Simple Electrical Power Calculator

To Determine: Single-Phase Three-Phase Direct Current
KVA I x E
1000
I x E x 1.73
1000
-----
Kilowatts I x E x PF
1000
I x E x 1.73 x PF
1000
I x E
1000
Horsepower 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 HP is known) HP x 746
E x %EFF x PF
HP x 746
1.73 x E x %EFF x PF
HP x 746
E x %EFF
Amperes (when kW is known) KW x 1000
E x PF
KW x 1000
1.73 x E x PF
KW x 1000
E
Amperes (when KVA is known) KVA x 1000
E
KVA x 1000
1.73 x E
------

NEMA Motor Starter Sizing Chart

NEMA Size NEMA Continuous Amp Rating MAX. HP @ 200V AC MAX. HP @ 230V AC MAX. HP @ 480/575V AC
00 9 1.5 1.5 2
0 18 3 3 5
1 27 7.5 7.5 10
2 45 10 15 25
3 90 25 35 50
4 135 40 50 100
5 270 75 100 200
6 540 150 200 400
7 810 ----- 300 600
8 1215 ----- 450 900
9 2250 ----- 800 1600