Energy Converter

Compare mechanical, electrical, thermal, food and particle-scale energy units in one view.

How energy converter works

Values are normalized through joules. A kilowatt-hour is exactly 3.6 megajoules and a thermochemical calorie is exactly 4.184 joules.

Example formula: kilowatt-hours × 3.6 = megajoules

Accurate, private conversion

The conversion engine uses standardized constants and keeps calculation precision separate from display formatting. Your entered values stay in this browser and are not added to the URL or sent to the server.

Frequently asked questions

Is a food Calorie the same as a calorie?

A food Calorie is normally a kilocalorie, equal to 1,000 small calories.

Are power and energy the same?

No. Energy is an amount; power is the rate at which energy is transferred or used.