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Convert between joules, calories, kWh, and BTU.
Energy Converter is a free browser-based tool that helps you convert between joules, calories, kwh, and btu. It is part of ToolsMonk's converters collection, so you can finish the job without downloading software, creating an account, or jumping between multiple websites.
This tool is especially useful for workflows such as converting food energy between calories (kcal) and kilojoules, translating electricity usage in kwh to joules, and energy conversions for physics and engineering. Because it runs directly in your browser, you can use it on desktop, tablet, or mobile while keeping the process fast and easy for one-off tasks as well as repeat work.
Energy Converter is designed for people who want a practical, privacy-friendly workflow with instant results inside the larger ToolsMonk library.
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
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 is a powerful free online tool available on ToolsMonk that helps you convert between joules, calories, kwh, and btu. Whether you're a professional, student, or casual user, our energy converter provides instant, accurate results right in your browser without requiring any software installation or account creation.
As part of our Converters collection, this tool is designed with simplicity and power in mind. All processing happens client-side, ensuring your data remains completely private and secure. The tool works seamlessly across all modern browsers on desktop, tablet, and mobile devices.
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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