Watts to Amps Calculator
Electric power in watts (W) to electric current in amps (A) calculator.
* Use e for scientific notation. E.g: 5e3, 4e-8, 1.45e12
DC watts to amps calculation
The current I in amps (A) is equal to the power P in watts (W), divided by the voltage V in volts (V):
I(A) = P(W) / V(V)
AC single phase watts to amps calculation
The phase current I in amps (A) is equal to the power P in watts (W), divided by the power factor PF times the RMS voltage V in volts (V):
I(A) = P(W) / (PF × V(V))
The power factor of resistive impedance load is equal to 1.
AC three phase watts to amps calculation
Calculation with line to line voltage
The phase current I in amps (A) is equal to the power P in watts (W), divided by square root of 3 times the power factor PF times the line to line RMS voltage VL-L in volts (V):
I(A) = P(W) / (√3 × PF × VL-L(V) )
The power factor of resistive impedance load is equal to 1.
Calculation with line to neutral voltage
The phase current I in amps (A) is equal to the power P in watts (W), divided by 3 times the power factor PF times the line to neutral RMS voltage VL-N in volts (V):
I(A) = P(W) / (3 × PF × VL-N(V) )
The power factor of resistive impedance load is equal to 1.
Typical power factor values
Do not use typical power factor values for accurate calculations.
| Device | Typical power factor |
|---|---|
| Resistive load | 1 |
| Fluorescent lamp | 0.95 |
| Incandescent lamp | 1 |
| Induction motor full load | 0.85 |
| Induction motor no load | 0.35 |
| Resistive oven | 1 |
| Synchronous motor | 0.9 |
Watts to amps table (120V)
| Power (W) | Voltage (V) | Current (A) |
|---|---|---|
| 10 watts | 120 volts | 0.0833 amps |
| 20 watts | 120 volts | 0.167 amps |
| 30 watts | 120 volts | 0.250 amps |
| 40 watts | 120 volts | 0.333 amps |
| 50 watts | 120 volts | 0.417 amps |
| 60 watts | 120 volts | 0.500 amps |
| 70 watts | 120 volts | 0.583 amps |
| 80 watts | 120 volts | 0.667 amps |
| 90 watts | 120 volts | 0.750 amps |
| 100 watts | 120 volts | 0.833 amps |
| 200 watts | 120 volts | 1.667 amps |
| 300 watts | 120 volts | 2.500 amps |
| 400 watts | 120 volts | 3.333 amps |
| 500 watts | 120 volts | 4.167 amps |
| 600 watts | 120 volts | 5.000 amps |
| 700 watts | 120 volts | 5.833 amps |
| 800 watts | 120 volts | 6.666 amps |
| 900 watts | 120 volts | 7.500 amps |
| 1000 watts | 120 volts | 8.333 amps |
See also
ELECTRICAL CALCULATORS
- Amps to kW
- Amps to kVA
- Amps to VA
- Amps to volts
- Amps to watts
- Electricity bill
- Energy consumption
- Energy cost
- eV to volts
- Joules to watts
- Joules to volts
- kVA to amps
- kVA to watts
- kVA to kW
- kVA to VA
- kW to amps
- kW to volts
- kW to kWh
- kW to VA
- kW to kVA
- kWh to kW
- kWh to watts
- mAh to Wh
- Ohm's Law
- Power calculator
- Power factor
- VA to amps
- VA to watts
- VA to kW
- VA to kVA
- Voltage divider
- Volts to amps
- Volts to watts
- Volts to kW
- Volts to joules
- Volts to eV
- Watts-volts-amps-ohms
- Watts to amps
- Watts to joules
- Watts to kWh
- Watts to volts
- Watts to VA
- Watts to kVA
- Wh to mAh