Electrical Power Calculator
From Voltage & Current
From Current & Resistance
From Voltage & Resistance
Formula
P = IV | P = I²R | P = V²/R
Frequently Asked Questions
How do I calculate electrical power?
P = I × V (watts = amps × volts). Also: P = I²R and P = V²/R. For household circuits: a 120V outlet with a 10A appliance uses 1,200W (1.2 kW).
You may also need
A
Ohm's Law Calculator
Free Ohm's Law calculator. Calculate voltage, current, resistance, and power for any electrical circuit.
ScienceA
Resistance Calculator
Free resistance calculator. Calculate total resistance for series and parallel resistor combinations.
ScienceA
Energy Calculator
Free energy calculator. Calculate kinetic energy, potential energy, and work done. Convert between energy units (joules, calories, kWh).
Science