How to Use Energy Converter
Convert energy between joules, calories, kWh, BTU and more.
Open the Energy Converter tool →What is Energy Converter?
Convert energy between joules, calories, kWh, BTU and more. It's completely free, needs no sign-up, and runs entirely in your browser — so it's fast and private.
How to use Energy Converter
- Open the Energy Converter tool.
- Enter a value and choose the units to convert from and to.
- Read the converted result instantly — a full conversion table is shown too.
- Copy the value if you need it.
Frequently asked questions
How many joules in a calorie?
1 (thermochemical) calorie = 4.184 joules. A food Calorie (kcal) = 4,184 joules.
Is it free and private?
Yes — it's free, needs no sign-up, and converts instantly in your browser.
Ready to try it?
Open Energy Converter →