Watts to Amps Calculator
Calculate amps from watts, volts, and optional power factor in one quick tool.
This calculator uses the single-phase relationship between power, voltage, and current. Leave power factor at 1 for simple DC or resistive-load estimates.
amps = watts / (volts × power factor)
PF = 1
About the watts to amps calculator
How this tool works
Watts to amps is not a pure unit conversion because the result depends on voltage, and sometimes power factor. That makes it a calculator rather than a simple pair page.
This tool keeps the needed electrical inputs together so the current estimate is easier to check and explain.
Where it is useful
It is useful for appliance planning, rough electrical load checks, and quick educational reference.
When power factor matters, the calculator gives a better estimate than the simplified watts divided by volts shortcut.
- Estimate circuit current from a known wattage and supply voltage.
- Check appliance or equipment current draw quickly.
- Compare how the same wattage behaves at different voltages.
Example workflows
3 examples1200 W at 120 V
10 A
1500 W at 230 V
6.5217 A
1000 W at 120 V, PF 0.8
10.4167 A
includes power factor
Common uses
3 ideas- Estimate circuit current from a known wattage and supply voltage.
- Check appliance or equipment current draw quickly.
- Compare how the same wattage behaves at different voltages.
FAQ
3 answersWhat formula does the watts to amps calculator use?
For a simple single-phase estimate, amps equals watts divided by volts times power factor.
Why does this calculator include power factor?
Use 1 for resistive or DC-style estimates. Lower values help model AC loads where current and voltage are not perfectly aligned.
Can I convert watts to amps without a voltage value?
No. Voltage must be greater than zero or the current calculation becomes undefined.