Calculator Tools • Free Online Tool

Ohm's Law Calculator

Calculate Voltage, Current, Resistance, and Power instantly by entering any two known values.

Free to Use No Sign-Up Browser-Based
Online Tool

Ohm's Law Calculator

Ready
V
A
Ω
W

Enter any two values to calculate the others.

Calculated Values
The Ohm's Law Calculator is a professional-grade engineering utility for students, electricians, and electronics hobbyists. It provides a simple way to calculate the relationship between Voltage (V), Current (I), Resistance (R), and Power (P) based on Ohm's Law and Watt's Law. Simply input any two values, and the tool will automatically solve for the remaining two. Features support for various units and real-time calculation updates. All data is processed securely in your browser to ensure privacy.
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