Convert voltage (V) to current (A) using watts (I = P/V) or Ohm's Law (I = V/R). Select calculation mode.
Converting voltage (V) to current in amperes (A) is a fundamental electrical calculation. You can do it in two ways: (1) Volts to amps with watts: if you know power P in watts and voltage V, use I = P / V. (2) Volts to amps with ohms: if you know voltage V and resistance R in ohms, use Ohm's Law I = V / R. Both formulas are widely used in circuit design, load sizing, and troubleshooting. Our free Volts to Amps calculator supports both modes — select your calculation, enter the values, and get instant results.
With watts: I = P / V. Example: 2300 W at 230 V gives I = 2300 / 230 = 10 A. With ohms: I = V / R (Ohm's Law). Example: 12 V across 24 Ω gives I = 12 / 24 = 0.5 A. Current is the flow of electric charge; voltage is the potential difference that drives it. Resistance opposes current. In resistive DC or AC (magnitude) circuits, these three quantities are related by V = I × R, so I = V / R when you know V and R.
Use volts-to-amps with watts when you have a device's power rating (e.g. 100 W bulb at 230 V) and want to know the current draw. Use volts-to-amps with ohms when you know the voltage across a resistor and its resistance, or when designing LED circuits, heating elements, or series/parallel resistive loads. Both methods help size fuses, wires, and power supplies, and are essential for safe electrical design.
Our calculator lets you choose "Volts to amps with watts" or "Volts to amps with ohms." Enter voltage (and either watts or ohms), then calculate. Results are in amperes (A). No sign-up required. Whether you're a student, technician, or engineer, the Volts to Amps calculator delivers accurate current values for your electrical calculations.
With watts: 230 V, 1150 W → I = 1150 / 230 = 5 A. 120 V, 1440 W → I = 12 A. With ohms: 24 V, 48 Ω → I = 24 / 48 = 0.5 A. 230 V, 46 Ω → I = 5 A. A 60 W lamp at 120 V draws 60 / 120 = 0.5 A. A 12 V battery across 6 Ω draws 12 / 6 = 2 A.