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Volts to Amps Calculator

Convert voltage to current

Calculate Using

Result

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Formulas

With PI = P / V

With RI = V / R

Quick Reference

@120V	Amps
100 W	0.83 A
500 W	4.17 A
1000 W	8.33 A
1500 W	12.5 A

Converting Volts to Amps

To convert voltage to current, you need either power (watts) or resistance (ohms). This is because current depends on what load is connected to the voltage source.

Using Power (Watts)

I = P / V. A 1200W appliance on 120V draws: 1200 / 120 = 10 amps.

Using Resistance (Ohms)

I = V / R (Ohm's Law). A 12Ω resistor on 120V draws: 120 / 12 = 10 amps.

Frequently Asked Questions

You need watts or ohms. With watts: Amps = Watts ÷ Volts. With ohms (Ohm's Law): Amps = Volts ÷ Ohms. You cannot convert directly without one of these values.

It depends on the load connected. A 1200W heater at 120V = 10A. A 60W bulb = 0.5A. A 1500W space heater = 12.5A. Use: Amps = Watts ÷ 120.

V = I × R states that voltage equals current times resistance. Rearranged: I = V/R and R = V/I. This fundamental law describes the relationship between voltage, current, and resistance in electrical circuits.

Volts and amps measure different things. Volts is electrical "pressure," amps is electrical "flow." The same voltage can produce different currents depending on the resistance or power consumption of the load.