DJC Power Hire

The Southwest's Power Hire Solution

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01822 660361

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SUPPLYING GENERATORS, CABLES & POWER DISTRIBUTION FOR 20 YEARS
Electrical power calculators for volts, amps and KVA

Electrical power calculators & formulae

The following will help you determine the size of generator you need. Other calculators on this page are for power unit conversions.

Generator Power Calculator
Phase Volts Required
V
Amperes
I
Power
Factor
= Power
kW
1
3
.8
1.0

 

Converting kW to kVA Converting kVA to kW
kW = kVA kVA = kW

 

Converting kW to HP Calculating Amperes (when you know kVA)
kW = HP
 
Phase
1,2,3
Generator
kVA
Volts
Required
= Ampere
I

 

TO DETERMINE: SINGLE-PHASE THREE-PHASE DC
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 (where 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 (where kW is known) KW x 1000
E x PF
KW x 1000
1.73 x E x PF
KW x 1000
E
Amperes (where KVA is known) KVA x 1000
E
KVA x 1000
1.73 x E
P = power,
I or J = Latin: influare, international ampere, or intensity
R = resistance.
V = voltage, electric potential difference Δ V or E = electromotive force (emf = voltage).