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Energy Converter — Free Online Unit Converter

Energy Converter converts using 1 kcal = 4,184 J = 1.163 Wh — exact conversion factors between joules, calories and watt-hours. It runs entirely in your browser, so nothing you enter is uploaded to a server. Free to use, with no signup and no watermark.

How to use Energy Converter

  1. Enter or paste your energy value.
  2. Pick the units or target format.
  3. Copy the converted result.

Frequently asked questions

What formula does Energy Converter use?
1 kcal = 4,184 J = 1.163 Wh — exact conversion factors between joules, calories and watt-hours.
Do I need to install anything?
No. Energy Converter runs in any modern browser on desktop or mobile, with nothing to install.
Is there a limit on how many conversions I can do?
No. Conversions run locally in your browser, so there is no quota and no rate limit.

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