Case 1
- Current
- 10A
- Voltage
- 230V
2,300.00W
Open with these valuesAmps to Watts Calculator
2,300.00W
Result: 2,300.00 WMultiply the current by the voltage: 10 A at 230 V is 2300 W. That is the whole calculation for direct current and for the real power of a resistive load. An AC motor or a switching supply draws more current than this for the same watts — see the power factor below.
The numbers at a glance
Held fixed: Current 10.000 A.
| Voltage (V) | Result (W) |
|---|---|
| 100.00 | 1,000.00 |
| 200.00 | 2,000.00 |
| 230.00Your value | 2,300.00 |
| 300.00 | 3,000.00 |
| 400.00 | 4,000.00 |
Worked examples
Case 2
- Current
- 16A
- Voltage
- 230V
3,680.00W
Open with these valuesCase 3
- Current
- 5A
- Voltage
- 12V
60.00W
Open with these valuesHow it's calculated
P = V × I
- StepRead the current in amperes from the rating plate or the fuse.
- StepRead the supply voltage — 230 V in Europe, 120 V in North America.
- ResultMultiply the two; the result is the power in watts.
What this number means
P = V × I needs no constant
It follows from the SI definitions of the volt and the ampere, so there is nothing here to look up. Ten amps at 230 volts is 2300 watts, sixteen amps 3680 watts.
Alternating current is not direct current
The product is the real power only while current and voltage stay in step, as they do in heaters, kettles and filament lamps. Motors, transformers and switching supplies need the power factor as a third term: P = V × I × PF.
Without the power factor this is apparent power
A motor drawing the same 10 A at 230 V can convert closer to 1900 W than the 2300 W this calculator prints. The gap is the power factor, and this calculator has no field for it.
Commonly misread
A motor on 10 A at 230 V converts 2300 W.
That is the apparent power. The real power is P = V × I × PF and lands lower — nearer 1900 W in this example.
Watts depend on the current alone.
The same 10 A carries 120 W at 12 V and 2300 W at 230 V. Without the voltage the wattage is not determined.
A kettle needs the power factor too.
Current and voltage stay in step in a purely resistive load, so P = V × I already is the real power.
Reference table
| Current, voltage | Where it turns up | Power |
|---|---|---|
| 1, 120 | A small US appliance | 120 |
| 5, 12 | A 12 V car circuit | 60 |
| 10, 230 | A common EU wall socket | 2300 |
| 13, 230 | A UK plug at its fuse | 2990 |
| 16, 230 | An EU kitchen circuit | 3680 |
Questions
How do I convert amps to watts?
Multiply amps by volts. Ten amps at 230 volts is 2300 watts, and sixteen amps on the same circuit is 3680 watts.
Do I need the voltage?
Yes. Amperes measure how much charge flows, volts measure how hard it is pushed, and power is the product of the two. The same 10 A carries 120 W at 12 V and 2300 W at 230 V.
Does this work for alternating current?
It gives the real power only when current and voltage stay in step, which is the case for heaters, kettles and filament lamps. Motors, transformers and switching supplies need the power factor as a third term: P = V × I × PF.
Which voltage should I enter?
The one your outlet actually supplies. Europe is nominally 230 V, North America 120 V for ordinary sockets and 240 V for large appliances.
Sources and last check
Information, not professional advice.