👤 By Why Calculator Team ✔ Reviewed by Matt Le (Founder of Why Calculator) 📅 Last Updated December 03, 2025
Amps to Volts Calculator
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Want to quickly convert amps to volts? This easy-to-use Amps to Volts Calculator helps you effortlessly calculate voltage using either power or resistance. Simply enter the current, choose your units, and toggle between power or resistance inputs. Perfect for students, engineers, and hobbyists alike!
How to Convert Amp to Volt?
To convert amps to volts, you need either resistance or power. Using Ohm’s Law, multiply current (amps) by resistance (ohms) to get voltage. If power is known, divide power (watts) by current (amps) to find voltage. In AC circuits, you can consider impedance instead of simple resistance.
Below, I’ll explain the formulas and provide examples for each scenario.
1. Using Ohm’s Law (When Resistance is Known):
Ohm’s Law states that voltage is the product of current and resistance:
V = I × R
Where:
- V = Voltage (in volts, V)
- I = Current (in amperes, A)
- R = Resistance (in ohms, Ω)
Example:
If the current is 2 A and the resistance is 5 Ω, the voltage is:
V = 2 A × 5 Ω = 10 V
Using Power Formula (When Power is Known):
The Power Formula relates voltage, current, and power:
P = V × I
Rearranged to solve for voltage:
V = P / I
Where:
- P = Power (in watts, W)
- I = Current (in amperes, A)
Example:
If the power is 100 W and the current is 5 A, the voltage would be:
V = 100 W / 5 A = 20 V
Example: Using Ohm’s Law
- Current (I) = 3 A
- Resistance (R) = 4 Ω
- Voltage (V) =?
V = I × R = 3 A × 4 Ω
= 12 V
| # | Current (I) in Amps | Power (P) in Watts | Voltage (V) in Volts |
|---|---|---|---|
| 1 | 1 | 10 | 10.00 |
| 2 | 2 | 20 | 10.00 |
| 3 | 3 | 30 | 10.00 |
| 4 | 4 | 40 | 10.00 |
| 5 | 5 | 50 | 10.00 |
| 6 | 6 | 60 | 10.00 |
| 7 | 7 | 70 | 10.00 |
| 8 | 8 | 80 | 10.00 |
| 9 | 9 | 90 | 10.00 |
| 10 | 10 | 100 | 10.00 |
| # | Current (I) in Amps | Resistance (R) in Ohms | Voltage (V) in Volts |
|---|---|---|---|
| 1 | 1 | 5 | 5.00 |
| 2 | 2 | 10 | 20.00 |
| 3 | 3 | 15 | 45.00 |
| 4 | 4 | 20 | 80.00 |
| 5 | 5 | 25 | 125.00 |
| 6 | 6 | 30 | 180.00 |
| 7 | 7 | 35 | 245.00 |
| 8 | 8 | 40 | 320.00 |
| 9 | 9 | 45 | 405.00 |
| 10 | 10 | 50 | 500.00 |