Energy Converter
Convert joules, calories, kWh, BTU and other energy units.
✓ Free forever✓ No login✓ Private (in-browser)
1 J =
0.001 kJ
All conversions from Joule
1
Joule (J)
0.001
Kilojoule (kJ)
0.000001
Megajoule (MJ)
0.23900574
Calorie (cal)
0.00023901
Kilocalorie (kcal)
0.00027778
Watt-hour (Wh)
2.777778e-7
Kilowatt-hour (kWh)
0.00094781
BTU (BTU)
How to use Energy Converter
- Open the Energy Converter page — it loads instantly with no login.
- Provide your input: paste text, upload a file, or enter your numbers.
- Results appear instantly and update as you type.
- Download, copy, or share your result — however you like.
- Done! That's it. No account, no limits, no tracking of your data.
Frequently Asked Questions
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