Energy conversion

Convert Kilocalorie to Kilojoule

1 kilocalorie (kcal) equals 4.184 kilojoule (kJ). Enter any value below to convert from kcal to kJ.

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1 kcal = 4.184 kJ

All Energy units

From 1 kcal
UnitValue
Joule J 4,184
Kilojoule kJ 4.184
Thermochemical calorie cal 1,000
Kilocalorie kcal 1
Watt-hour Wh 1.1622222222
Kilowatt-hour kWh 0.0011622222
BTU (International Table) BTUₕᵀ 3.9656668314
Foot-pound ft·lb 3,085.9600325761
Electronvolt eV 2.6114473968e22
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Formula

kcal to kJ conversion formula

Use this relationship for a direct conversion:

kJ = kcal x 4.184

Worked example

2 kcal = 8.368 kJ.

The thermochemical calorie and International Table BTU are named explicitly to avoid ambiguous legacy definitions.

Quick reference

Kilocalorie to Kilojoule table

Kilocalorie (kcal)Kilojoule (kJ)
0.010.04184
0.10.4184
14.184
28.368
520.92
1041.84
25104.6
50209.2
100418.4
1,0004,184

From unit

About the kilocalorie

One thousand thermochemical calories.

Symbol: kcal

To unit

About the kilojoule

One thousand joules.

Symbol: kJ

Keep converting

Related conversions

Kilojoule to KilocalorieReverse this conversion Kilocalorie to Joulekcal to JKilocalorie to Thermochemical caloriekcal to calKilocalorie to Watt-hourkcal to WhKilocalorie to Kilowatt-hourkcal to kWhKilocalorie to BTU (International Table)kcal to BTUₕᵀKilocalorie to Foot-poundkcal to ft·lb

Source

Conversion standard

Definitions are checked against NIST SP 811: Energy units. Calculations use full internal precision before display rounding.

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Questions

kcal to kJ FAQ

How do you convert kilocalorie to kilojoule?

Use the formula kJ = kcal x 4.184. 1 kilocalorie (kcal) equals 4.184 kilojoule (kJ).

Is the kcal to kJ conversion exact?

Both unit definitions use exact factors. Only the displayed decimal may be rounded.