Skip to content
RK Calculator
Menu

Kilocalories to Kilojoules Converter

Convert kilocalories (food Calories) (kcal) to kilojoules (kJ), with the formula, a conversion table and exact factors.

Change the values and press Calculate to work out your own figures.

Enter an amount of energy, choose its unit and the unit you want. The answer is exact until it is shown, and the same value appears in every other unit.

A number, fraction (3/8), mixed number (1 1/2), scientific notation (2.5e6) or a simple sum such as 2*3.
The unit you want the answer in. Swap exchanges the two units.
Result
4.184 kJ
joules (watt-seconds)
4,184 J
megajoules
0.004184 MJ
gigajoules
4.184 × 10⁻⁶ GJ
calories (thermochemical)
1,000 cal
megacalories
0.001 Mcal
watt-hours
1.16222222222 Wh
kilowatt-hours
0.00116222222222 kWh
megawatt-hours
1.16222222222 × 10⁻⁶ MWh
British thermal units (IT)
3.96566683139 Btu
million Btu
3.96566683139 × 10⁻⁶ MMBtu
therms (100,000 Btu)
3.96566683139 × 10⁻⁵ thm
quads (10¹⁵ Btu)
3.96566683139 × 10⁻¹⁵ quad
electronvolts
2.61144739675 × 10²² eV
kiloelectronvolts
2.61144739675 × 10¹⁹ keV
megaelectronvolts
2.61144739675 × 10¹⁶ MeV

1 kcal = 4.184 kJ

Show the working
  1. 1 kcal = 4.184 kJ
  2. 1 × 4.184 = 4.184 kJ

How to convert kilocalories to kilojoules

1 kcal = 4.184 kJ, so multiply by 4.184 to go from kilocalories (food Calories) to kilojoules. Going the other way, 1 kJ = 0.239005736138 kcal.

kJ = kcal × 4.184
kcal = kJ × 0.239005736138

Worked example:

1 kcal = 4.184 kJ
5 × 4.184 = 20.92 kJ

Kilocalories to kilojoules table

KilocaloriesKilojoules
1 kcal4.184 kJ
2 kcal8.368 kJ
3 kcal12.552 kJ
4 kcal16.736 kJ
5 kcal20.92 kJ
6 kcal25.104 kJ
7 kcal29.288 kJ
8 kcal33.472 kJ
9 kcal37.656 kJ
10 kcal41.84 kJ
15 kcal62.76 kJ
20 kcal83.68 kJ
25 kcal104.6 kJ
30 kcal125.52 kJ
40 kcal167.36 kJ
50 kcal209.2 kJ
75 kcal313.8 kJ
100 kcal418.4 kJ
250 kcal1,046 kJ
500 kcal2,092 kJ
1000 kcal4,184 kJ

About the units

Kilocalories (kcal)
Kilocalories (food Calories), a specialised unit. Definition: NIST SP 811 Appendix B.8, factors for units listed alphabetically.

Formula version 0.1.0Reviewed