Does this Ohms Law Calculator save my inputs?

No. The calculation runs in your browser and the page only displays the result for the values currently entered.

Why might my result differ slightly from another calculator?

Small differences usually come from rounding, unit choices, default assumptions, or a different formula variant. Check the inputs and formula assumptions first.

Ohms Law Calculator

Solve voltage, current, or resistance from two known values.

Physicselectricityelectronicsphysics

Current

A

Resistance

Ω

Ohms Law Calculator Formula

V = I × R

Enter the known values and the calculator applies this formula to produce the main result, plus supporting values that help you check the answer.

Symbol	Variable	Description
current	Current	Current, entered in A.
resistance	Resistance	Resistance, entered in Ω.

How to Use the Ohms Law Calculator

1
Enter the known values
Fill in the fields and confirm that the units match the formula shown on the page.
2
Click Calculate
The primary answer appears in the highlighted row, with related check values underneath.
3
Read the result
Voltage is the pressure across the resistance. Power helps you see whether a resistor or component rating is likely to be exceeded.

What This Calculator Is Best For

Use it to calculate voltage from current and resistance, then check the associated electrical power.

Choose a resistor rating.
Check a simple DC circuit.
Estimate power draw.

How to Read the Result

Voltage is the pressure across the resistance. Power helps you see whether a resistor or component rating is likely to be exceeded.

Before You Rely on the Result

Use amperes and ohms for a voltage result in volts.

Ohms Law Calculator FAQ

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