Convert kilocalories to megajoules
1 kcal = 0.004184 MJ — 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 megajoules
Multiply the number of kilocalories by 0.004184 to get megajoules.
The exact factor is 0.004184 — as a fraction, 523/125000.
Kilocalorie: The Calorie on food labels — 1000 small calories.
Kilocalorie to Megajoule conversion table
| Kilocalories (kcal) | Megajoules (MJ) |
|---|---|
| 1 kcal | 0.004 184 |
| 2 kcal | 0.008 368 |
| 3 kcal | 0.012 552 |
| 5 kcal | 0.020 92 |
| 10 kcal | 0.041 84 |
| 20 kcal | 0.083 68 |
| 25 kcal | 0.1046 |
| 50 kcal | 0.2092 |
| 100 kcal | 0.4184 |
| 250 kcal | 1.046 |
| 500 kcal | 2.092 |
| 1000 kcal | 4.184 |
Megajoule to Kilocalorie conversion table
| Megajoules (MJ) | Kilocalories (kcal) |
|---|---|
| 1 MJ | 239.005 74 |
| 2 MJ | 478.011 47 |
| 3 MJ | 717.017 21 |
| 5 MJ | 1195.0287 |
| 10 MJ | 2390.0574 |
| 20 MJ | 4780.1147 |
| 25 MJ | 5975.1434 |
| 50 MJ | 11 950.287 |
| 100 MJ | 23 900.574 |
| 250 MJ | 59 751.434 |
| 500 MJ | 119 502.87 |
| 1000 MJ | 239 005.74 |
Frequently asked
How many megajoules are in a kilocalorie?
One kilocalorie equals 0.004184 megajoules (kcal → MJ). That figure is exact, not rounded.
How do you convert kilocalories to megajoules?
Multiply the number of kilocalories by 0.004184 to get megajoules.
What is 1 MJ in kilocalories?
One megajoule is 239.0057361 kilocalories.
What is 10 kcal in MJ?
10 kcal = 0.041 84 MJ.
What exactly is a kilocalorie?
The Calorie on food labels — 1000 small calories.