Power Converter

Power Converter — Convert Watts, Kilowatts, Horsepower & BTU/h Online

The Power Converter is a free online tool that converts between every common power unit: watts (W), kilowatts (kW), megawatts (MW), horsepower (HP, both mechanical and metric), BTU per hour, foot-pounds per second, calories per second, and more. Power describes how quickly energy is delivered or consumed, and converting between units is essential in engineering, energy markets, automotive, HVAC, and physics.

Power Units Across Industries

Different fields stick to their own preferred power units. Electric utilities and electronics use watts and kilowatts. Auto manufacturers in North America rate engines in horsepower; metric markets use kilowatts or metric horsepower (which differs slightly from mechanical HP). HVAC equipment is sized in BTU per hour. Cooking energy is sometimes calories per second. Without accurate conversion, comparing engine specs, HVAC capacities, or solar panel ratings across regions becomes a guessing game.

How to Use the Converter

Enter your power value, select the source unit, and pick the target unit. The conversion appears instantly with high precision. The tool handles small electronics power (microwatts) and utility-scale generation (gigawatts) with scientific notation support, and distinguishes correctly between mechanical horsepower (745.7 W) and metric horsepower (735.5 W).

Common Use Cases

Mechanical engineers compare engine specifications. Electrical engineers size transformers and inverters. HVAC contractors translate BTU/h to kW for international equipment. Solar designers compare panel ratings. Students complete physics and engineering homework. The tool is free, runs entirely in your browser, mobile-friendly, and requires no signup.

Tamer Baghdadi

CEO / Co-Founder