Volts ↔ Watts Converter
Electrical
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Inputs
Formula
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What this converter does
This converter turns volts into watts and back. Power is voltage times current, so enter the current in amps — a 12 V supply at 2 A gives 24 W. Type a value and read the result as you type.
This is the DC (or resistive) relationship. For AC motor loads with a power factor, use the Amps to Watts converter instead.
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The units it covers
Voltage and power are linked by current — in a DC circuit, power is voltage times current.
View all units & their values
| Unit | Symbol | Value | Mainly used |
|---|---|---|---|
| Volt | V | voltage | Supply voltage |
| Watt | W | power | Power drawn |
| Current | A | input | Current in amps |
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The formula
For a DC (or resistive) circuit, power equals voltage times current:
Conversion
W = V × AWhere:
- V = voltage in volts
- W = power in watts
- A = current in amps
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Worked example
How many watts is 12 V at 2 A?
Step 1 · The formula
W = V × AStep 2 · Substitute
12 × 2 = 24 WSo 12 V drawing 2 A is 24 watts.
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The units in this example
Voltsymbol: V
The electrical potential of a supply. Multiplied by current, it gives power in watts.
Common voltage/power values
- 12 V @ 2 A = 24 W
- 120 V @ 1 A = 120 W
- 5 V @ 2 A = 10 W
- W = V × A
Wattsymbol: W
The power a device draws — voltage times current in a DC circuit.
Common voltage/power values
- W = V × A
- V = W ÷ A
- 120 W @ 120 V = 1 A
- 1,000 W = 1 kW
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FAQ
QHow many watts is 120 volts?
It depends on the current — 120 V at 1 A is 120 W.
QHow do I convert volts to watts?
Multiply the voltage by the current in amps.
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