Converters
Energy Converter
Convert energy between joules, calories, kWh and BTU.
Free foreverRuns in your browserNo sign-up
4.184
1 kcal equals 4.184 kJ.
1 kcal in every unit
| Joule (J) | 4184 |
| Kilojoule (kJ) | 4.184 |
| Megajoule (MJ) | 0.004184 |
| Calorie (cal) | 1000 |
| Kilocalorie (kcal) | 1 |
| Watt hour (Wh) | 1.162222 |
| Kilowatt hour (kWh) | 0.001162 |
| British thermal unit (BTU) | 3.965667 |
| Foot-pound (ft·lb) | 3085.960033 |
About the Energy Converter
Convert energy between joules, calories, watt hours and BTU.
Enter a value, choose your units, and see the result along with a full table of every unit.
Handy for nutrition, electricity bills, heating and physics.
Key features
- 9 units including kcal, kWh and BTU
- Live conversion table for every unit
- One-click swap between from and to
- Copy the result instantly
How to use
- 1Type the energy you want to convert.
- 2Choose the unit you have and the unit you want.
- 3Read the result or copy it in one click.
Examples
Kilocalories to kilojoules
Input:
1 kcalOutput:
4.184 kJA food calorie (kcal) is 4.184 kilojoules.
kWh to joules
Input:
1 kWhOutput:
3.6e+6 JOne kilowatt hour is 3.6 million joules.
Frequently asked questions
- How many joules are in a calorie?
- One calorie is 4.184 joules. A food kilocalorie (kcal) is 4,184 joules.
- How many joules are in a kWh?
- One kilowatt hour is 3,600,000 joules, the energy used by a 1,000 watt device in one hour.
- Is my data uploaded?
- No. The conversion runs entirely in your browser.