Convert amps to volts from current and power in watts, or solve for amps or watts (equal to VA at unity power factor) from the other two with P = V × I.

P = V × I for DC, or single-phase AC at unity power factor using RMS values. Not for three-phase or other power factors.

Optional settings

Calculator Operations Required Inputs
Convert Volts and Amps to Watts Enter Volts, Enter Amps
Convert Watts and Volts to Amps Enter Watts, Enter Volts
Convert Watts and Amps to Volts Enter Watts, Enter Amps

Amp to Volt Formula

The following formula is used to calculate the total number of volts from amps and watts.

V = P / I
  • Where V is volts
  • P is watts
  • and I is amps

To convert amps to volts, divide the power by the current.

Amp to Volt Conversion Table (V = W ÷ A)
Watts (W) Amps (A) Volts (V)
0.750.51.5
1025
1829
24212
95519
48224
180536
240548
300560
7201072
9601096
120010120
208010208
220010220
230010230
240010240
277010277
400010400
480010480
600010600
*Uses P = V × I. Volts (V) = Watts (W) ÷ Amps (A). For single-phase AC circuits, use RMS values and power factor = 1; this is not a three-phase formula.

Amp to Volt Definition

Converting amps to volts is the process of dividing the total watts by the total amps to yield total volts.

Amp to Volt Example

How to calculate volts?

  1. First, determine the total power of the circuit or system

    Power in electric terms is measured in watts.

  2. Next, determine the current of the system

    This is typically measured in amps.

  3. Calculate the voltage

    Calculate the total number of volts using the watts and amps found in steps 1 and 2.

FAQ

What is voltage?

Voltage is electric potential difference, measured in volts (joules per coulomb).

What is current?

Current is the rate of flow of electric charge, measured in amperes (coulombs per second). For DC, voltage is power divided by nonzero current.

amp to volt formula