Energy Converter

Convert between joules, calories, kilowatt-hours, BTU, and more.

Value

From

Enter your values to calculate your result.

Formula

Every energy unit converts through joules (the base unit) using its exact standard ratio — for example, 1 dietary Calorie (kcal) is exactly 4184 J.

How many kJ are in a food Calorie?

One dietary Calorie (kcal, what's listed on nutrition labels) equals exactly 4.184 kJ.

TDEE / Calorie Calculator

Find your daily calorie needs to maintain, lose, or gain weight.

Power Converter

Convert between watts, kilowatts, horsepower, and more.