How to use Energy Converter
- Type the value you want to convert.
- Choose the unit you are converting from and the unit you want.
- Read the result instantly – every other unit is listed in the table below it.
- Use “Copy” to copy the result, or “Swap” to convert the other way.
Common energy conversions
| From | Equals |
|---|---|
| 1 Kilocalorie (food Calorie) (kcal) | 4.184 kJ (Kilojoule) |
| 1 Kilojoule (kJ) | 0.2390057361 kcal (Kilocalorie (food Calorie)) |
| 1 Kilowatt-hour (kWh) | 3.6 MJ (Megajoule) |
| 1 Kilowatt-hour (kWh) | 3,412.141633 BTU (BTU (International Table)) |
| 1 BTU (International Table) (BTU) | 1.055055853 kJ (Kilojoule) |
| 1 Therm (US) (thm) | 29.30011111 kWh (Kilowatt-hour) |
| 1 Joule (J) | 0.2390057361 cal (Calorie (thermochemical)) |
Kilocalorie (food Calorie) to Kilojoule table
| Kilocalorie (food Calorie) (kcal) | Kilojoule (kJ) |
|---|---|
| 1 kcal | 4.184 kJ |
| 2 kcal | 8.368 kJ |
| 5 kcal | 20.92 kJ |
| 10 kcal | 41.84 kJ |
| 20 kcal | 83.68 kJ |
| 25 kcal | 104.6 kJ |
| 50 kcal | 209.2 kJ |
| 100 kcal | 418.4 kJ |
| 500 kcal | 2,092 kJ |
| 1,000 kcal | 4,184 kJ |
Units in this converter
Joule (J), Kilojoule (kJ), Megajoule (MJ), Calorie (thermochemical) (cal), Kilocalorie (food Calorie) (kcal), Watt-hour (Wh), Kilowatt-hour (kWh), Megawatt-hour (MWh), BTU (International Table) (BTU), Therm (US) (thm), Foot-pound force (ft·lbf), Electronvolt (eV).
Examples
- A 250 kcal snack = 1,046 kJ
- 1 kWh = 3.6 MJ = 3,412 BTU
- 1 therm = 29.31 kWh
Supported formats
| Input | Number |
|---|---|
| Output | Converted value, Full conversion table |
| Processing | On your device, in the browser (no upload) |
Limitations to know
- This tool uses the thermochemical calorie (4.184 J), which food labels use. Other calorie definitions differ by less than 0.1%.
- Results are shown to up to 10 significant digits; extremely large or small values switch to scientific notation (e.g. 1.5e-12).
Privacy: Energy Converter runs entirely in your web browser. Your Number data is not uploaded, stored or shared, and nothing about its contents is sent to analytics.
Frequently asked questions
Are food Calories the same as kilocalories?
Yes. The capital-C “Calorie” on food labels is one kilocalorie (kcal), equal to 4.184 kJ.
How many BTU are in a kilowatt-hour?
One kWh is about 3,412 BTU.
References
Last updated · Maintained by the ZippyToolkit team