Enter any two of voltage, current, resistance, or power to calculate the other two. Accepts SI prefixes like 4.7k, 20m, 100ยต, and 4k7. The two most recently edited fields are used as inputs.
input
= 12 V
calculated
25.53 mA
I = V / R
input
= 470 ฮฉ
calculated
306.4 mW
P = Vยฒ / R
Formula Reference
Voltage
V = I ร R
V = P / I
V = โ(P ร R)
Current
I = V / R
I = P / V
I = โ(P / R)
Resistance
R = V / I
R = Vยฒ / P
R = P / Iยฒ
Power
P = V ร I
P = Iยฒ ร R
P = Vยฒ / R