About the Volts to Amps Calculator
This calculator converts V to A. V is volts, the electrical pressure that pushes the current, and A is amperes, the flow of electric current. It divides the power by the voltage, then by the power factor on AC, and by √3 when the supply is three-phase. Enter your figures and the answer appears at once, together with a few related values, and you can copy the result with one tap. The sums are done in your browser and nothing is sent anywhere.
Updated October 2026
How to use the Volts to Amps Calculator
- 1Enter the value in V.
- 2Fill in the other boxes that the V to A calculation needs, such as time, voltage or power factor.
- 3Read the answer in the large result box.
- 4Check the extra rows for related values.
- 5Press Copy result to keep it.
When you need V to A
You cannot turn volts into amps with volts alone, because current depends on how much power the load uses. With the wattage and the voltage, however, the answer is quick, and it is the figure you need to pick a fuse, a cable or a circuit breaker.
Electricians use the sum for sizing circuits: a 3,000 W appliance at 230 V draws about 13 A, which suits a 16 A circuit. Campers use it for 12 V systems, where the same 3,000 W would need 250 A, which shows why high-power loads are run from higher voltages.
How the V to A sum works
Amps = watts ÷ volts for DC. For AC divide by the power factor too, and by √3 for three-phase. A 1,500 W heater on a 230 V single-phase supply with a power factor of 1 draws 1,500 ÷ 230 = 6.52 A.
The displayed answer is rounded to six significant figures, but the sum itself is not rounded, so converting V to A and back again gives you the number you started with.
- Higher voltage means lower current
- Use the correct power factor
- Add a margin when choosing a breaker
Mistakes to avoid when converting V to A
The main mistake is to use the nominal power instead of the real power, or to leave out the power factor on AC. Another is using the wrong voltage: a 120 V appliance and a 230 V appliance of the same wattage draw very different currents.
On phone and computer
On a phone, type in the boxes one after another and read the A result underneath; the Copy button puts it on the clipboard for a message or a note. On a computer the inputs sit on the left and the answer on the right, so you can change one figure and watch the A value move. The V to A page works the same on both. If you know the power, Watts to Amps Calculator and Amps to Watts Calculator are shorter routes. Voltage Drop Calculator checks long cable runs, and Wire Gauge Calculator helps you choose a cable that can carry the current.
Features
- V to A in one step
- Related values shown with the answer
- Clear messages for impossible inputs
- Copy the result with one tap
- Private: nothing is uploaded
- Works on phone and computer
Frequently asked questions
How do I convert V to A?
Amps = watts ÷ volts for DC. For AC divide by the power factor too, and by √3 for three-phase. A 1,500 W heater on a 230 V single-phase supply with a power factor of 1 draws 1,500 ÷ 230 = 6.52 A.
What is the formula for V to A?
Amps = watts ÷ volts for DC. For AC divide by the power factor too, and by √3 for three-phase. The calculator applies it exactly and rounds only the displayed answer.
What is the difference between V and A?
V is volts, the electrical pressure that pushes the current. A is amperes, the flow of electric current. They measure different things, which is why converting from V to A needs more than a simple multiplication in some cases.
How many amps is 1,000 watts at 120 volts?
1,000 ÷ 120 = 8.33 A for a load with a power factor of 1.
Does the answer include a safety margin?
No. It is the calculated current. Choose cables and breakers with a margin, following your local wiring rules.
Is this V to A calculator free and private?
Yes. It is free, needs no account, and runs in your browser, so the figures you type are not uploaded or stored. It is meant for planning and learning; for wiring or safety work, check the result against your equipment's rating plate and local rules.