Energy conversion

Convert Joule to Kilocalorie

1 joule (J) equals 0.000239005736 kilocalorie (kcal). Enter any value below to convert from J to kcal.

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1 J = 0.0002390057 kcal

All Energy units

From 1 J
UnitValue
Joule J 1
Kilojoule kJ 0.001
Thermochemical calorie cal 0.2390057361
Kilocalorie kcal 0.0002390057
Watt-hour Wh 0.0002777778
Kilowatt-hour kWh 0.0000002778
BTU (International Table) BTUₕᵀ 0.0009478171
Foot-pound ft·lb 0.7375621493
Electronvolt eV 6.2415090745e18
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Formula

J to kcal conversion formula

Use this relationship for a direct conversion:

kcal = J x 0.000239005736

Worked example

2 J = 0.0004780115 kcal.

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

Quick reference

Joule to Kilocalorie table

Joule (J)Kilocalorie (kcal)
0.010.0000023901
0.10.0000239006
10.0002390057
20.0004780115
50.0011950287
100.0023900574
250.0059751434
500.0119502868
1000.0239005736
1,0000.2390057361

From unit

About the joule

The SI unit of energy, equal to one newton meter.

Symbol: J

To unit

About the kilocalorie

One thousand thermochemical calories.

Symbol: kcal

Keep converting

Related conversions

Kilocalorie to JouleReverse this conversion Joule to KilojouleJ to kJJoule to Thermochemical calorieJ to calJoule to Watt-hourJ to WhJoule to Kilowatt-hourJ to kWhJoule to BTU (International Table)J to BTUₕᵀJoule to Foot-poundJ to ft·lb

Source

Conversion standard

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

View the complete energy converter

Questions

J to kcal FAQ

How do you convert joule to kilocalorie?

Use the formula kcal = J x 0.000239005736. 1 joule (J) equals 0.000239005736 kilocalorie (kcal).

Is the J to kcal conversion exact?

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