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Watts, amps and volts calculator

Calculate amps, watts or volts from the values you know. Choose DC or AC and include power factor when the selected circuit requires it.

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Set your data

Set your data

Choose missing quantity and circuit, then enter other values. In DC, 2300 W at 230 V is 10 A. For AC use power factor; three-phase voltage is line-to-line.

Result

Your result will appear here.

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How to use the tool

  1. Choose missing quantity and circuit, then enter other values.
  2. In DC, 2300 W at 230 V is 10 A.
  3. For AC use power factor; three-phase voltage is line-to-line.
  4. Change the unknown using the equivalent values for the current circuit. The formula includes the power factor for AC.
  5. Drag the controls in the figure, or focus them and use the arrow keys. The form updates immediately. Use the form fields for values outside the figure’s scale.
  6. The result updates as you edit the fields or the figure. You can copy it immediately.

Method and principles

Formula

P = V × I
P = V × I for DC; P = V × I × PF for AC; × √3 for balanced three-phase. Does not size cables or protection.

Practical example

Input
  • Value to calculate: Amps (A)
  • Circuit: Direct current
  • Voltage (V; line-to-line for three-phase): 230
  • Active power (W): 2300
Result
10 A

Limits and checks

Limits and checks
ParameterValue
Voltage (V; line-to-line for three-phase)≥ 0.000001; ≤ 1000000000
Current (A)≥ 0.000001; ≤ 1000000000
Active power (W)≥ 0.000001; ≤ 1000000000
Power factor (AC)≥ 0.000001; ≤ 1
PRACTICAL GUIDES

How much electricity does an appliance use?

A 1,000 W heater running at full power for two hours a day uses 60 kWh in 30 days. At an illustrative $0.18 per kWh, that’s $10.80.

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