Volts to Amps Electrical Conversion Calculator

Convert volts to amps by entering the voltage and the electrical power in watts, or the resistance of the circuit.

Volts and Watts to Amps
Volts and Ohms to Amps

Convert Volts and Watts to Amps

Convert Volts and Ohms to Amps

Results:

Amps

Milliamps

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How to Convert Volts to Amps

Voltage is the potential difference in an electrical circuit, measured in volts. It might be easier to think of it as the amount of force or pressure pushing electrons through a conductor. To convert volts to amps, a measure of current, it’s possible to use a formula defined by Watt’s Law.

Watt’s Law states that current = power ÷ voltage. Power is measured in watts and voltage is measured in volts.

Thus, to find amps substitute the volts and watts in the formula:
Current_(A) = Power_(W) ÷ Voltage_(V)

Power triangle illustrating the formula to convert volts to amps with amps being equal to watts divided by volts

For example, find the amperage of a 100 watt light bulb at 120 volts.

amps = watts ÷ volts
amps = 100 W ÷ 120 V
amps = .83 A

Convert Volts to Amps using Resistance

Ohm’s Law provides an alternate formula to find volts if amps and the electrical resistance is known. To calculate amps, divide the voltage by the resistance in ohms.

Current_(A) = Voltage_(V) ÷ Resistance_(Ω)

For example, let’s find the current of a 12 volt circuit with 10 ohms of resistance.

amps = volts ÷ ohms
amps = 12 V ÷ 10 Ω
amps = 1.2 A

Equivalent Volts and Amps Measurements

Equivalent volts and amps for various power ratings
Voltage	Current	Power
5 Volts	1 Amps	5 Watts
5 Volts	2 Amps	10 Watts
5 Volts	3 Amps	15 Watts
5 Volts	4 Amps	20 Watts
5 Volts	5 Amps	25 Watts
5 Volts	6 Amps	30 Watts
5 Volts	7 Amps	35 Watts
5 Volts	8 Amps	40 Watts
5 Volts	9 Amps	45 Watts
5 Volts	10 Amps	50 Watts
5 Volts	11 Amps	55 Watts
5 Volts	12 Amps	60 Watts
5 Volts	13 Amps	65 Watts
5 Volts	14 Amps	70 Watts
5 Volts	15 Amps	75 Watts
5 Volts	16 Amps	80 Watts
5 Volts	17 Amps	85 Watts
5 Volts	18 Amps	90 Watts
5 Volts	19 Amps	95 Watts
5 Volts	20 Amps	100 Watts
12 Volts	0.4167 Amps	5 Watts
12 Volts	0.8333 Amps	10 Watts
12 Volts	1.25 Amps	15 Watts
12 Volts	1.667 Amps	20 Watts
12 Volts	2.083 Amps	25 Watts
12 Volts	2.5 Amps	30 Watts
12 Volts	2.917 Amps	35 Watts
12 Volts	3.333 Amps	40 Watts
12 Volts	3.75 Amps	45 Watts
12 Volts	4.167 Amps	50 Watts
12 Volts	4.583 Amps	55 Watts
12 Volts	5 Amps	60 Watts
12 Volts	5.417 Amps	65 Watts
12 Volts	5.833 Amps	70 Watts
12 Volts	6.25 Amps	75 Watts
12 Volts	6.667 Amps	80 Watts
12 Volts	7.083 Amps	85 Watts
12 Volts	7.5 Amps	90 Watts
12 Volts	7.917 Amps	95 Watts
12 Volts	8.333 Amps	100 Watts
24 Volts	0.2083 Amps	5 Watts
24 Volts	0.4167 Amps	10 Watts
24 Volts	0.625 Amps	15 Watts
24 Volts	0.8333 Amps	20 Watts
24 Volts	1.042 Amps	25 Watts
24 Volts	1.25 Amps	30 Watts
24 Volts	1.458 Amps	35 Watts
24 Volts	1.667 Amps	40 Watts
24 Volts	1.875 Amps	45 Watts
24 Volts	2.083 Amps	50 Watts
24 Volts	2.292 Amps	55 Watts
24 Volts	2.5 Amps	60 Watts
24 Volts	2.708 Amps	65 Watts
24 Volts	2.917 Amps	70 Watts
24 Volts	3.125 Amps	75 Watts
24 Volts	3.333 Amps	80 Watts
24 Volts	3.542 Amps	85 Watts
24 Volts	3.75 Amps	90 Watts
24 Volts	3.958 Amps	95 Watts
24 Volts	4.167 Amps	100 Watts
120 Volts	0.0417 Amps	5 Watts
120 Volts	0.0833 Amps	10 Watts
120 Volts	0.125 Amps	15 Watts
120 Volts	0.1667 Amps	20 Watts
120 Volts	0.2083 Amps	25 Watts
120 Volts	0.25 Amps	30 Watts
120 Volts	0.2917 Amps	35 Watts
120 Volts	0.3333 Amps	40 Watts
120 Volts	0.375 Amps	45 Watts
120 Volts	0.4167 Amps	50 Watts
120 Volts	0.4583 Amps	55 Watts
120 Volts	0.5 Amps	60 Watts
120 Volts	0.5417 Amps	65 Watts
120 Volts	0.5833 Amps	70 Watts
120 Volts	0.625 Amps	75 Watts
120 Volts	0.6667 Amps	80 Watts
120 Volts	0.7083 Amps	85 Watts
120 Volts	0.75 Amps	90 Watts
120 Volts	0.7917 Amps	95 Watts
120 Volts	0.8333 Amps	100 Watts