Convert kilocalories to joules
1 kcal = 4184 J — exactly. Both units are defined against the SI, so this factor is a fraction, not an approximation.
4184J
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1 kcal = 4184 J
Show this value in all 39 energy & work units
- Petajoules PJ 4.184e-12
- Terajoules TJ 4.184e-9
- Gigajoules GJ 0.000 004 184
- Megajoules MJ 0.004 184
- Kilojoules kJ 4.184
- Joules J 4184
- Millijoules mJ 4 184 000
- Microjoules µJ 4 184 000 000
- Nanojoules nJ 4 184 000 000 000
- Watt-hours Wh 1.162 222 222 22
- Kilowatt-hours kWh 0.001 162 222 222 22
- Megawatt-hours MWh 0.000 001 162 222 222 22
- Gigawatt-hours GWh 1.16222222222e-9
- Terawatt-hours TWh 1.16222222222e-12
- Calorie (thermochemical)s cal 1000
- Kilocalories kcal 1
- Calorie (IT)s cal (IT) 999.331 231 489
- Kilocalorie (IT)s kcal (IT) 0.999 331 231 489
- British thermal units BTU 3.965 666 831 39
- BTU (thermochemical)s BTU (th) 3.968 321 714 8
- Million BTUs MMBTU 0.000 003 965 666 831 39
- Therm (US)s thm 0.000 039 666 137 026 4
- Therm (EC)s thm (EC) 0.000 039 656 662 774 3
- Electronvolts eV 2.61144739675e+22
- Kiloelectronvolts keV 2.61144739675e+19
- Megaelectronvolts MeV 2.61144739675e+16
- Gigaelectronvolts GeV 26 114 473 967 500
- Teraelectronvolts TeV 26 114 473 967.5
- Ergs erg 41 840 000 000
- Foot-pounds ft·lbf 3085.960 032 58
- Inch-pounds in·lbf 37 031.520 390 9
- Foot-poundals ft·pdl 99 287.827 931 3
- Horsepower-hours hp·h 0.001 558 565 673 02
- Tonne of TNTs t TNT 0.000 001
- Kiloton of TNTs kt TNT 1e-9
- Megaton of TNTs Mt TNT 1e-12
- Hartrees Eₕ 9.59689217281e+20
- Rydbergs Ry 1.91937843456e+21
- Quads quad 3.96566683139e-15
Every row is Kilocalorie (kcal) converted through the joule, in exact rational arithmetic.
How to convert kilocalories to joules
Multiply the number of kilocalories by 4184 to get joules.
The exact factor is 4184 .
Kilocalorie: The Calorie on food labels — 1000 small calories.
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 |
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 |
Frequently asked
How many joules are in a kilocalorie?
One kilocalorie equals 4184 joules (kcal → J). That figure is exact, not rounded.
How do you convert kilocalories to joules?
Multiply the number of kilocalories by 4184 to get joules.
What is 1 J in kilocalories?
One joule is 0.0002390057361 kilocalories.
What is 10 kcal in J?
10 kcal = 41 840 J.
What exactly is a kilocalorie?
The Calorie on food labels — 1000 small calories.