Convert kilocalories to gigajoules
1 kcal = 0.000004184 GJ — exactly. Both units are defined against the SI, so this factor is a fraction, not an approximation.
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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 gigajoules
Multiply the number of kilocalories by 0.000004184 to get gigajoules.
The exact factor is 0.000004184 — as a fraction, 523/125000000.
Kilocalorie: The Calorie on food labels — 1000 small calories.
Kilocalorie to Gigajoule conversion table
| Kilocalories (kcal) | Gigajoules (GJ) |
|---|---|
| 1 kcal | 0.000 004 184 |
| 2 kcal | 0.000 008 368 |
| 3 kcal | 0.000 012 552 |
| 5 kcal | 0.000 020 92 |
| 10 kcal | 0.000 041 84 |
| 20 kcal | 0.000 083 68 |
| 25 kcal | 0.000 104 6 |
| 50 kcal | 0.000 209 2 |
| 100 kcal | 0.000 418 4 |
| 250 kcal | 0.001 046 |
| 500 kcal | 0.002 092 |
| 1000 kcal | 0.004 184 |
Gigajoule to Kilocalorie conversion table
| Gigajoules (GJ) | Kilocalories (kcal) |
|---|---|
| 1 GJ | 239 005.74 |
| 2 GJ | 478 011.47 |
| 3 GJ | 717 017.21 |
| 5 GJ | 1 195 028.7 |
| 10 GJ | 2 390 057.4 |
| 20 GJ | 4 780 114.7 |
| 25 GJ | 5 975 143.4 |
| 50 GJ | 11 950 287 |
| 100 GJ | 23 900 574 |
| 250 GJ | 59 751 434 |
| 500 GJ | 119 502 870 |
| 1000 GJ | 239 005 740 |
Frequently asked
How many gigajoules are in a kilocalorie?
One kilocalorie equals 0.000004184 gigajoules (kcal → GJ). That figure is exact, not rounded.
How do you convert kilocalories to gigajoules?
Multiply the number of kilocalories by 0.000004184 to get gigajoules.
What is 1 GJ in kilocalories?
One gigajoule is 239005.7361 kilocalories.
What is 10 kcal in GJ?
10 kcal = 0.000 041 84 GJ.
What exactly is a kilocalorie?
The Calorie on food labels — 1000 small calories.