Electrical Power Calculator
Find power (watts) from any two of voltage, current, or resistance.
Related calculators
Back to Physics & Science CalculationsAcceleration Calculator
Enter initial velocity, final velocity, and time to compute acceleration instantly.
Density Calculator
Enter mass and volume to find density quickly.
Force Calculator
Enter any two values to compute the third using F = m * a.
Frequency Period Converter
Switch between frequency and period with accurate conversions for physics, electronics, and timing calculations.
Kinetic Energy Calculator
Enter any two values to compute the third using KE = 0.5 * m * v^2.
How electrical power is calculated
Electrical power can be calculated as P = V × I. With Ohm's law, you can derive missing values.
If voltage and resistance are known, current is V / R. If current and resistance are known, voltage is I × R.
The calculator requires at least two inputs to solve the rest.