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Convert between joules, calories, kWh, and BTU.
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Among ToolsMonk's converters, Energy Converter covers a single everyday need: convert between joules, calories, kwh, and btu. Open the page and start working, with no download or sign-up standing between you and the result.
Typical jobs it handles include converting food energy between calories (kcal) and kilojoules, translating electricity usage in kwh to joules, and energy conversions for physics and engineering. The same page works on desktop, tablet, and mobile, so it is equally quick for a single urgent task and for work you repeat every week.
Energy Converter is designed for people who want a practical, privacy-friendly workflow with instant results inside the larger ToolsMonk library.
| Price | Free, no signup, no paywall, no watermark |
|---|---|
| Works on | Any modern browser: desktop, tablet, and mobile |
| Processing | In your browser, files never leave your device |
| Account required | None |
| Category | Converters |
Enter an energy value in any unit
See the equivalents across other units instantly
Read the value you need
Change the input to convert another value
Converts between energy units, joules, kilojoules, calories, kWh, and more
Instant conversion across units as you type
Accurate factors for science, nutrition, and utilities
Useful for food energy, electricity, and physics
Runs in your browser, nothing is uploaded
Free, with no signup and no cap on conversions
Converting food energy between calories (kcal) and kilojoules
Translating electricity usage in kWh to joules
Energy conversions for physics and engineering
Comparing energy figures across units
Energy Converter was built so that anyone, professional or first-time visitor, gets what the page promises (convert between joules, calories, kwh, and btu) in seconds. Results are instant and accurate, and nothing needs to be installed or signed up for along the way.
All processing runs locally in your browser, so your files and data never leave your device. The interface adapts to any modern browser and screen size, so the Converters workflow you rely on at a desk is the same one you get on a tablet or phone.
Energy Converter translates between energy units, joules, kilojoules, calories, kilocalories, kilowatt-hours, and more, instantly, spanning nutrition, electricity, and physics.
It clears up one of the most common confusions in everyday units: the 'Calorie' on food labels (capital C) is actually a kilocalorie (1,000 small calories), so a 200-Calorie snack is 200 kcal. Many countries also label food in kilojoules, where 1 kcal ≈ 4.184 kJ, exactly the conversion you need to compare products across the two systems.
On the utilities side, the kilowatt-hour from your electricity bill is an energy unit too: the energy of a 1,000-watt device running an hour, equal to 3.6 million joules. Converting kWh to joules bridges your bill and physics, useful for energy calculations and comparisons.
Conversion runs in your browser with nothing uploaded, using precise factors. Pair it with the other ToolsMonk unit converters for nutrition, science, and everyday energy reference.
Food 'Calories' are really kilocalories (kcal); 1 kcal ≈ 4.184 kJ for label comparisons
1 kWh = 3.6 million joules, the link between your electricity bill and physics units
Use kcal/kJ for nutrition, joules/kWh for energy and electricity
Common questions about this tool, its workflow, and what to expect before you use it.
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Convert between joules, calories, kWh, and BTU.
Use Energy Converter free →Live tool (iframe)
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