About Energy Conversion
Energy conversions are used in nutrition, physics, electricity billing, and HVAC systems.
Energy Converter
Convert between Joules, calories, kWh, and BTU.
Metric
Scientific
Imperial
Share This Tool
Popular Energy Conversions
Energy Conversion Factors
| Unit | In joules | Per joule |
|---|---|---|
| Kilojoules (kJ) | 1 kJ = 1,000 J | 1 J = 0.001 kJ |
| Calories (cal) | 1 cal = 4.184 J | 1 J = 0.2390057361 cal |
| Kilocalories (kcal) | 1 kcal = 4,184 J | 1 J = 0.000239005736 kcal |
| Watt-hours (Wh) | 1 Wh = 3,600 J | 1 J = 0.000277777778 Wh |
| Kilowatt-hours (kWh) | 1 kWh = 3,600,000 J | 1 J = 0.000000277778 kWh |
| BTU (BTU) | 1 BTU = 1,055.055853 J | 1 J = 0.00094781712 BTU |
Frequently Asked Questions
How many Joules in a calorie?
1 calorie equals 4.184 Joules.
Add this converter to your website
Free for any website, blog or class page. Paste this HTML where you want the tool to appear.