Amps to Volts Calculator

Reviewed by the ElectricalConverters editorial team Last updated July 2026 Estimates only — how we check

Enter current in amps and resistance in ohms to calculate voltage using Ohm's Law (V = I × R). Works for DC and resistive AC circuits.

Current (A)

Resistance (Ω)

RESULT — VOLTAGE

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Formula: V = A × Ω

How do you convert amps to volts?

Use Ohm's Law: volts = amps × ohms. A 5 A current through a 24 Ω resistance gives 5 × 24 = 120 V. You need both current and resistance — amps alone cannot give volts. Rearranged, current I = V ÷ R and resistance R = V ÷ I.

Amps to Volts Formula (Ohm's Law)

V = I × R

Ohm's Law states that voltage across a conductor is equal to the current through it multiplied by its resistance. V = voltage (volts), I = current (amperes), R = resistance (ohms). Rearrangements:

I = V ÷ R

R = V ÷ I

Also show how all four Ohm's Law quantities relate to power:

P = V × I = I² × R = V² ÷ R

Full Ohm's Law guide to

Example 1: 5 A through 24 Ω to V = 5 × 24 = 120 V (standard US household voltage)

Example 2: 0.5 A through 8 Ω (speaker) to V = 0.5 × 8 = 4 V

Understanding Ohm's Law

A simple way to understand Ohm's Law is to think of water flowing through a pipe. Voltage (V) represents the water pressure pushing the water, current (I) represents the flow rate of the water, and resistance (R) represents the pipe diameter limiting the flow. Increasing the pressure (voltage) or widening the pipe (lowering resistance) increases the flow (current).

to Learn Ohm's Law in depth

Amps to Volts Reference Table (V = I × R)

Current	1 Ω	4 Ω	8 Ω	12 Ω	24 Ω	100 Ω	1000 Ω
0.1 A	0.1 V	0.4 V	0.8 V	1.2 V	2.4 V	10 V	100 V
0.5 A	0.5 V	2 V	4 V	6 V	12 V	50 V	500 V
1 A	1 V	4 V	8 V	12 V	24 V	100 V	1000 V
2 A	2 V	8 V	16 V	24 V	48 V	200 V	2000 V
5 A	5 V	20 V	40 V	60 V	120 V	500 V	5000 V
10 A	10 V	40 V	80 V	120 V	240 V	1000 V	10000 V
15 A	15 V	60 V	120 V	180 V	360 V	1500 V	15000 V
20 A	20 V	80 V	160 V	240 V	480 V	2000 V	20000 V

Frequently Asked Questions

How do I convert amps to volts?

Use Ohm's Law: V = I × R, where V is voltage in volts, I is current in amps, and R is resistance in ohms. Example: 5 A through 24 Ω = 5 × 24 = 120 V.

What formula converts amps to volts?

V = I × R (Ohm's Law). Rearranging: I = V ÷ R; R = V ÷ I. You need both current and resistance to find voltage — amps alone are not sufficient.

How many volts is 10 amps at 12 ohms?

V = 10 × 12 = 120 V.

Can I convert amps to volts without resistance?

No. Voltage depends on both current and resistance (V = I × R). Without knowing the resistance of the circuit, the conversion is not mathematically possible. Use a multimeter to measure resistance if it is unknown.

What is the relationship between amps, volts, and watts?

P (watts) = V (volts) × I (amps). Combined with Ohm's Law: P = I² × R and P = V² ÷ R. Use these when you know any two quantities to find the third. See our Watts to Amps and Amps to Watts calculators.