Ohm's Law Calculator
Calculate voltage, current, resistance, and power using Ohm's Law (V=IR). Enter any two values to instantly compute the remaining two electrical quantities.
Results
Voltage12.00 VVolts
Current2.000 AAmperes
Resistance6.000 ΩOhms
Power24.00 WWatts
Ohm's Law Formulas
V = I × R
I = V / R
R = V / I
P = V × I
About Ohm's Law Calculator
Ohm's Law states that voltage (V) equals current (I) multiplied by resistance (R): V = IR. Combined with the power formula P = VI, you can derive any of the four electrical quantities given any two known values. This calculator supports all six combinations of two known values and displays results with appropriate SI prefixes (milli, kilo, mega, etc.) for readability. Essential for electronics hobbyists, electrical engineers, and students.
Private & free — this tool runs entirely in your browser.
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