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POWER

Electrical Power Calculator

Real power · Apparent power · Reactive power · Power factor · Energy

P = V × I PF = P / S

DC Power

P = V × I — enter voltage and current

V
A
Power (P) — W
Energy (1 hour) — Wh
Resistance (R) — Ω
P = V × I

Power curve

V ↑ P ↑ P
Power increases linearly with voltage (constant current)

AC Power

Enter RMS voltage, current and power factor

V
A
PF
Real power (P) — W
Apparent power (S) — VA
Reactive power (Q) — VAR
Phase angle — °
P = V·I·PF  |  S = V·I  |  Q = S·sin(φ)

Power triangle

P S Q φ PF = cos φ
PF = P / S — Q is reactive power

Power Factor correction

Enter real power and apparent power

W
VA
Power factor — PF
Reactive power (Q) — VAR
Phase angle — °
Correction required — VAR
PF = P / S

PF gauge

0.83 PF 0 1.0
PF near 1.0 is ideal

Energy consumption

Calculate energy from power and time

W
hr
$/kWh
Energy — kWh
Cost — $
CO₂ emissions (est.) — kg
E = P × t  |  Cost = E × Price

Consumption breakdown

1 hr 2 hr 4 hr 8 hr
Energy consumption over time