Convert joules to kilocalories
1 J = 0.000239005736138 kcal — exactly. Both units are defined against the SI, so this factor is a fraction, not an approximation.
0.000 239 005 736 138kcal
As a fraction: 1/4184
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1 J = 0.000239005736138 kcal
Show this value in all 39 energy & work units
- Petajoules PJ 1e-15
- Terajoules TJ 1e-12
- Gigajoules GJ 1e-9
- Megajoules MJ 0.000 001
- Kilojoules kJ 0.001
- Joules J 1
- Millijoules mJ 1000
- Microjoules µJ 1 000 000
- Nanojoules nJ 1 000 000 000
- Watt-hours Wh 0.000 277 777 777 778
- Kilowatt-hours kWh 0.000 000 277 777 777 778
- Megawatt-hours MWh 2.77777777778e-10
- Gigawatt-hours GWh 2.77777777778e-13
- Terawatt-hours TWh 2.77777777778e-16
- Calorie (thermochemical)s cal 0.239 005 736 138
- Kilocalories kcal 0.000 239 005 736 138
- Calorie (IT)s cal (IT) 0.238 845 896 627
- Kilocalorie (IT)s kcal (IT) 0.000 238 845 896 627
- British thermal units BTU 0.000 947 817 120 313
- BTU (thermochemical)s BTU (th) 0.000 948 451 652 677
- Million BTUs MMBTU 9.47817120313e-10
- Therm (US)s thm 9.48043427973e-9
- Therm (EC)s thm (EC) 9.47816987913e-9
- Electronvolts eV 6.24150907446e+18
- Kiloelectronvolts keV 6 241 509 074 460 000
- Megaelectronvolts MeV 6 241 509 074 460
- Gigaelectronvolts GeV 6 241 509 074.46
- Teraelectronvolts TeV 6 241 509.074 46
- Ergs erg 10 000 000
- Foot-pounds ft·lbf 0.737 562 149 277
- Inch-pounds in·lbf 8.850 745 791 33
- Foot-poundals ft·pdl 23.730 360 404 2
- Horsepower-hours hp·h 0.000 000 372 506 135 999
- Tonne of TNTs t TNT 2.39005736138e-10
- Kiloton of TNTs kt TNT 2.39005736138e-13
- Megaton of TNTs Mt TNT 2.39005736138e-16
- Hartrees Eₕ 2.2937122784e+17
- Rydbergs Ry 4.58742455679e+17
- Quads quad 9.47817120313e-19
Every row is Joule (J) converted through the joule, in exact rational arithmetic.
How to convert joules to kilocalories
Multiply the number of joules by 0.000239005736138 to get kilocalories.
Kilocalorie: The Calorie on food labels — 1000 small calories.
Joule to Kilocalorie conversion table
| Joules (J) | Kilocalories (kcal) |
|---|---|
| 1 J | 0.000 239 005 74 |
| 2 J | 0.000 478 011 47 |
| 3 J | 0.000 717 017 21 |
| 5 J | 0.001 195 028 7 |
| 10 J | 0.002 390 057 4 |
| 20 J | 0.004 780 114 7 |
| 25 J | 0.005 975 143 4 |
| 50 J | 0.011 950 287 |
| 100 J | 0.023 900 574 |
| 250 J | 0.059 751 434 |
| 500 J | 0.119 502 87 |
| 1000 J | 0.239 005 74 |
Kilocalorie to Joule conversion table
| Kilocalories (kcal) | Joules (J) |
|---|---|
| 1 kcal | 4184 |
| 2 kcal | 8368 |
| 3 kcal | 12 552 |
| 5 kcal | 20 920 |
| 10 kcal | 41 840 |
| 20 kcal | 83 680 |
| 25 kcal | 104 600 |
| 50 kcal | 209 200 |
| 100 kcal | 418 400 |
| 250 kcal | 1 046 000 |
| 500 kcal | 2 092 000 |
| 1000 kcal | 4 184 000 |
Frequently asked
How many kilocalories are in a joule?
One joule equals 0.0002390057361 kilocalories (J → kcal). That figure is exact, not rounded.
How do you convert joules to kilocalories?
Multiply the number of joules by 0.000239005736138 to get kilocalories.
What is 1 kcal in joules?
One kilocalorie is 4184 joules.
What is 10 J in kcal?
10 J = 0.002 390 057 4 kcal.
What exactly is a kilocalorie?
The Calorie on food labels — 1000 small calories.