Unit Converters

Kilocalories to Kilojoules Converter

Type a value in kilocalories to get it in kilojoules, and see the reverse conversion.

By TheCalcTools Updated Formula checked and tested

Your numbers

Your results

Converted value
Kilojoules (kJ)
—
1 kcal in kJ
—
Your number read as kJ, in kcal
—
Joules (J)
—

Kilocalories to Kilojoules Converter by TheCalcTools

How the Kilocalories to Kilojoules Converter works

Multiply kilocalories (food Calories) by 4.184 to get kilojoules. An average adult intake of 2,000 kcal is about 8,368 kJ.

To convert kilocalories to kilojoules, multiply by 4.184. The calculator shows the result to 6 significant figures; the conversion factor itself is exact for the thermochemical calorie (4.184 J).

Quick estimate in your head: multiply kcal by 4.2.

The formula

kJ = kcal × 4.184kcal = kJ ÷ 4.184

Worked example

Using the default values shown in the calculator:

Value in kilocalories (kcal)2000
  1. 2,000 kcal × 4.184 = 8368 kJ.

Result:

Kilojoules (kJ)8368
1 kcal in kJ4.184
Your number read as kJ, in kcal478.011
Joules (J)8368000

Conversion table

kcalkJ
50 kcal209.2 kJ
100 kcal418.4 kJ
250 kcal1,046 kJ
500 kcal2,092 kJ
1,000 kcal4,184 kJ
2,000 kcal8,368 kJ
2,500 kcal10,460 kJ

Frequently asked questions

What is 1 kilocalorie in kilojoules?

1 kilocalorie (kcal) equals 4.184 kJ.

Sources and further reading

Kilojoules to Kilocalories ConverterType a value in kilojoules to get it in kilocalories, and see the reverse conversion Energy ConverterElectricity bills, food labels and heating energy in one tool BMR CalculatorEstimate how many calories your body burns at rest (BMR), and how many you use in a day… BTU to Kilowatt-hours ConverterType a value in btu to get it in kilowatt-hours, and see the reverse conversion

More in Unit Converters · All calculators

This calculator gives estimates for information only. Check important results independently before you rely on them. See our disclaimer.