This free online Power Calculator allows you to calculate power using different formulas: Energy divided by Time, Mechanical Power (Force × Distance ÷ Time), and Electrical Power (P = V × I or P = V² ÷ R). It supports unit conversions such as joules, kilojoules, watt-hours, kilowatt-hours, calories, newtons, pounds-force, meters, feet, and more. Results are displayed instantly in watts (W), kilowatts (kW), and horsepower (hp). This tool is perfect for students, engineers, electricians, and anyone who needs fast and accurate power calculations for physics, mechanical, or electrical applications.