Energy Converter (kWh, kcal, joule)
Convert joules, kJ, calories, kcal, Wh, kWh (electricity units) and BTU.
Result
How to use
- 1
Type the energy you want to convert.
- 2
Pick the From and To units — or press Swap to flip them.
- 3
See the answer, the formula, every other unit and a ready table of common values.
Questions
What is one ‘unit’ of electricity?
One unit on an Indian electricity bill is 1 kWh — a 1,000-watt appliance running for one hour. 1 kWh = 36,00,000 joules.
Is a food Calorie the same as a calorie?
No. The Calorie on food labels is a kilocalorie (kcal) = 1,000 calories ≈ 4.184 kJ. This tool uses the thermochemical calorie (4.184 J).
What is a BTU?
A British Thermal Unit is about 1,055 joules — the heat to warm one pound of water by 1 °F. AC and heater ratings sometimes use BTU.
About this Energy tool
Energy Converter (kWh, kcal, joule) — Convert joules, kJ, calories, kcal, Wh, kWh (electricity units) and BTU. It is one of 200 free tools on namasivayam.in, made by software engineer Namasivayam Vadivelan for everyday use in India.
Everything is calculated instantly in your browser: nothing you type or upload is sent to any server, there is no sign-up, and it works on mobile and desktop. Type the energy you want to convert.
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Results are estimates to help you plan. They are not financial, tax or medical advice.