About Energy Converter — Free Online Converter
Energy Converter covers fifteen units of energy and work: joules up to gigajoules, calories and kilocalories, watt-hours up to megawatt-hours, BTU, therms, foot-pounds, ergs, electronvolts and tonnes of oil equivalent.
Joules are the base, and the definitions are stated rather than approximated: the calorie is the thermochemical one of exactly 4.184 J, so a food kilocalorie is 4,184 J, and the BTU is the International Table value of 1055.05585262 J rather than one of the several other BTUs still in circulation. The span is extreme — from the electronvolt, which has eighteen zeros after its decimal point, up to the tonne of oil equivalent at 41.868 GJ — so results smaller than a millionth, or of a quadrillion and above, are printed in exponential form instead of as a row of zeros.
The arithmetic is performed in the browser with no server involved at any point. A meter reading or an unpublished test result typed here does not leave the machine it was typed on.
Converting a nutrition label between kilocalories and kilojoules, turning an electricity bill in kWh into megajoules, comparing a gas therm against a kWh tariff, and reading a value given in electronvolts or ergs.
Also known as: convert energy · joules to calories · kwh to joules · btu to kwh · food calories to kj · change energy format
When to use it
Translate nutrition labels between Calories and Kilojoules, or calculate household electric bill kWh energy usage.
How it works
Uses 1 Joule = 1 Watt-second as the baseline international standard.
Food Calories vs Physics Calories
1 dietary Calorie (with a capital C) = 1 kcal = 4,184 Joules.
How to Use Energy Converter in 4 Easy Steps
Follow this simple guide to process your files in seconds directly inside your browser tab.
Enter Value to Convert
Type or paste the measurement into the Energy Converter workspace above. Converts capacity to perform work across electrical, thermal, mechanical, and dietary units.
Select Source & Target Units
Choose the exact units you want to convert between. Translate nutrition labels between Calories and Kilojoules, or calculate household electric bill kWh energy usage.
Instant Dynamic Conversion
The Energy Converter engine converts your measurement instantaneously with high decimal precision and zero latency.
Copy or Reuse Output
Copy the converted result to your clipboard with one click or adjust your input for additional unit conversions.
Why Use Energy Converter on ShortTrick
Engineered for maximum speed, strict privacy, and frictionless digital productivity.
100% Local & Private
All conversions in Energy Converter happen in your browser memory. No entries or measurements are ever sent over the network.
Instant Bidirectional Conversion
Converts values immediately in Energy Converter as you type without page reloads or waiting.
Free & Unlimited Use
Convert unlimited measurements with Energy Converter with zero restrictions, paywalls, or registrations.
Exact SI & NIST Standards
Energy Converter uses official international conversion constants to prevent cumulative rounding errors.
High Decimal Precision
Calculates with accurate scientific precision suitable for engineering and coursework.
Works Across All Devices
Works smoothly on iOS, Android, macOS, Windows, and Linux browsers.
Frequently Asked Questions About Energy Converter
Common questions regarding Energy Converter, data privacy, file format compatibility, and usage limits.
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