Amps to Watts Calculator
Amps to Watts Formulas
DC amps to watts:
P(W) = I(A) × V(V)
AC single phase amps to watts:
P(W) = PF × I(A) × V(V)
AC three phase amps to watts:
P(W) = √3 × PF × I(A) × VL-L(V)
Where:
- P(W) = Power in watts
- I(A) = Current in amps
- V(V) = Voltage in volts
- PF = Power Factor
- √3 = 1.732 (square root of 3)
- VL-L = Line to Line voltage
How to Convert Amps to Watts
To convert amps to watts, follow these steps:
- Select the current type (DC, AC Single Phase, or AC Three Phase)
- Enter the current in amps
- Enter the voltage in volts
- For AC circuits, enter the power factor (typically between 0 and 1)
- Click "Calculate" to get the power in watts
- Use "Reset" to clear all inputs and results
Understanding Power Factor
Power factor (PF) is the ratio of real power to apparent power. It ranges from 0 to 1, where:
- 1 = perfect efficiency (all power is real power)
- 0 = poor efficiency (all power is reactive)
Typical Power Factor Values
| Device/Equipment | Power Factor |
|---|---|
| Resistive load (heaters, incandescent lights) | 1.0 |
| Induction motors (loaded) | 0.85 |
| Fluorescent lighting | 0.95 |
| Computers | 0.65-0.8 |
DC vs AC Power Calculation
For DC circuits, power is simply voltage × current. For AC circuits, you must consider the power factor which accounts for the phase difference between voltage and current.