Home > Online Calculation Tools > Online power calculator
Tools Category

Online power calculator

Formula for calculating electric power:

Voltage V = R × (1)

Voltage V = P ÷ (2)

Power P = V × (3)

Electric current I = P ÷ (4)

Power P = V2 ÷ R (5)

(5)Example: a heaterresistanceThe power supply is 220V, and its power is 65Ω.

(220×220)÷65=744W

Pure DC resistance electric power, current and voltage online automatic calculator

Please enter any two values, and the third values will be calculated.

power P W(Watt)
Voltage V V(Electric current)
Electric current I A(ampere)