How it works
Calculate electrical current (amps) from power (watts) and voltage, with an optional AC power factor.
Enter the power in watts, the voltage in volts, and (for AC loads) a power factor. The calculator derives the current using I = P ÷ (V × pf).
Formula
I = P ÷ (V × pf); with pf = 1 for purely resistive / DC loads.
P- Power (W)
V- Voltage (V)
pf- Power factor (0–1)
I- Current (A)
Examples
- 1000 W at 230 VPower 1000 W · voltage 230 V · pf 1≈ 4.35 A
Frequently asked questions
What power factor should I use?
Use 1 for DC or purely resistive loads. For AC equipment, use its documented power factor (often 0.8–0.95).
Does this work for three-phase power?
No — this is the single-phase formula. Three-phase systems are a separate tool.
How to read the result
More voltage for a given power means less current, and a lower power factor means more current for the same real power.
Limitations
Single-phase AC/DC only; no voltage drop or efficiency losses.
Source: P = V × I × pf (single-phase AC power).