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Convert kcal to kj

1 kilocalorie equals 4.184 kilojoules. Enter a value below to convert instantly.

1 kcal
4.184 kJ

Multiply the number of kilocalories by 4.184 to get kilojoules. How this is calculated

Copy link puts your number after the #, which browsers never send to a server — but the link itself carries it, so anyone you send it to sees the value. Save keeps the unit pair in this browser only; clear it any time from your saved list.

Need the other direction? Convert kilojoule to kilocalorie →

Formula

Multiply the number of kilocalories by 4.184 to get kilojoules.

Step by step

  1. Start with 1 kcal.
  2. Multiply by the conversion factor 4.184.
  3. 1 × 4.184 = 4.184 kJ.

Kilocalories to Kilojoules conversion table

Kilocalories (kcal) Kilojoules (kJ)
1 4.184
2 8.368
5 20.92
10 41.84
20 83.68
50 209.2
100 418.4
500 2,092
1,000 4,184

Convert Kilocalorie to other energy units

1 kcal expressed in every other energy unit on this site.

  • Joule J 4,184
  • Kilojoule kJ 4.184
  • Megajoule MJ 0.004184
  • Gigajoule GJ 0.000004184
  • Millijoule mJ 4,184,000
  • Microjoule µJ 4,184,000,000
  • Nanojoule nJ 4,184,000,000,000
  • Attojoule aJ 4.184e+21
  • Erg erg 41,840,000,000
  • Calorie (thermochemical) cal 1,000
  • Calorie (IT) cal(IT) 999.33123
  • Kilocalorie (IT) kcal(IT) 0.99933123
  • Megacalorie Mcal 0.001
  • Watt-hour Wh 1.1622222
  • Kilowatt-hour kWh 0.0011622222
  • Megawatt-hour MWh 0.0000011622222
  • Gigawatt-hour GWh 1.1622222e-9
  • Watt-second W·s 4,184
  • Kilowatt-second kW·s 4.184
  • Horsepower-hour hp·h 0.0015585657
  • British Thermal Unit BTU 3.9656668
  • BTU (thermochemical) BTU(th) 3.9683207
  • MBTU (thousand BTU) MBTU 0.0039656668
  • MMBTU (million BTU) MMBTU 0.0000039656668
  • Therm (US) thm (US) 0.000039666137
  • Therm (EC) thm (EC) 0.000039656512
  • Ton-hour (refrigeration) ton·h 0.00033047224
  • Foot-pound ft·lbf 3,085.96
  • Inch-pound in·lbf 37,031.52
  • Foot-poundal ft·pdl 99,287.828
  • Kilogram-force Meter kgf·m 426.64926
  • Gram-force Centimeter gf·cm 42,664,926
  • Gram-force Meter gf·m 426,649.26
  • Kilogram-force Centimeter kgf·cm 42,664.926
  • Ounce-force Inch ozf·in 592,504.33
  • Horsepower-hour (metric) PS·h 0.0015801825
  • Electronvolt eV 2.6114474e+22
  • Kiloelectronvolt keV 2.6114474e+19
  • Megaelectronvolt MeV 2.6114474e+16
  • Gigaelectronvolt GeV 26,114,474,000,000
  • Hartree Eh 9.5968922e+20
  • Rydberg Ry 1.9193784e+21
  • Ton of TNT tTNT 0.000001
  • Kiloton of TNT ktTNT 1e-9
  • Megaton of TNT MtTNT 1e-12
  • Tonne of Oil Equivalent toe 9.9933123e-8
  • Barrel of Oil Equivalent bboe 6.8389891e-7
  • Gigaton of TNT GtTNT 1e-15
  • Fuel Oil Equivalent (kiloliter) FOE (kL) 1.0408574e-7
  • Fuel Oil Equivalent (US barrel) FOE (bbl) 6.5548212e-7

About the kilocalorie

The kilocalorie (kcal) is a Metric unit of energy. The 'Calorie' printed on nutrition labels — 1,000 thermochemical calories.

About the kilojoule

The kilojoule (kJ) is a SI unit of energy.

Where this conversion is used

Converting kilocalories to kilojoules comes up when nutrition labels, electricity bills, heating, and physics.

Related conversions

Frequently asked questions

How many kilojoules are in a kilocalorie?

One kilocalorie equals 4.184 kilojoules.

How do you convert kilocalories to kilojoules?

Multiply the number of kilocalories by 4.184 to get kilojoules.

What is 1 kilojoule in kilocalories?

One kilojoule equals 0.23900574 kilocalories.

When would I convert kilocalories to kilojoules?

This conversion is common when nutrition labels, electricity bills, heating, and physics.

Conversion factors are based on internationally agreed unit definitions. See our methodology and sources for details on how these values are verified.