Ohm's Law Calculator
Calculate voltage, current, resistance, or power using Ohm's Law. Enter any two known electrical values to solve for the unknown.
✓ Formula verified: January 2026
Ohm's Law
Results below
Enter Values
Voltage
120 V
Power
240 W
Formula Used
V = I × R
What if your voltage (v) changes? 108 V → 120 V · 120 V → 120 V · 132 V → 120 V
Scenario Comparison
Conservative (5%)
$16,470.09
$6,470.09 interest
Your scenario (7%)
$20,096.61
$10,096.61 interest
Aggressive (10%)
$27,070.41
$17,070.41 interest
High-risk (14%)
$40,224.71
$30,224.71 interest
Best return
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Ohm's Law Wheel
V = I × R
120.00 V
SolvedI = V ÷ R
2.000 A
R = V ÷ I
60.00 Ω
P = V × I
240.00 W
Derived Values
P = I²R240.00 W
P = V²/R240.00 W
V = √(P × R)120.00 V
I = √(P / R)2.00 A
V = I × R
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