Free Energy Converter – Joules, Calories, kWh & BTU

One calorie equals about 4.184 joules, and one kilocalorie (the 'Calorie' on food labels) equals about 4,184 joules. Enter a value and the converter shows the exact equivalent at once.

Enter a value in the kilowatt-hours field and the joules result updates instantly. One kilowatt-hour equals 3,600,000 joules, so the converter handles the large numbers for you.

Kisi bhi unit ke box mein value type karo — jaise joules, calories, kcal ya kWh — aur baaki units turant update ho jayengi. Food labels ke liye bhi useful hai. Sab browser mein hota hai.

A lowercase calorie is a small unit, while the capital-C Calorie on food labels is actually a kilocalorie, equal to 1,000 small calories. The converter includes both calories and kilocalories so you can use the correct one.

Yes. After the page loads, the converter runs entirely in your browser using JavaScript, so it keeps working without an internet connection and never contacts a server.

Yes. Many food labels show energy in both kilocalories and kilojoules, and this converter lets you switch between them easily so you can compare products in whichever unit you prefer.

One British Thermal Unit (BTU) equals about 1,055 joules. The converter handles BTU directly, which is useful for heating, cooling, and air-conditioning calculations.

Yes. Everything is processed in your browser. No value you enter is uploaded, logged, or shared, so your data stays entirely on your own device.