Kilocalorie to Megajoule Converter

Energy Converter

27 units available

Decimals:

From

To

0.004184

1 kcal = 0.004184 MJ

Formula:

MJ = kcal × 0.004184

With your value: 1 kcal = 0.004184 MJ

How big is that?

Everyday references on a logarithmic scale, all expressed in kilocalorie so you can sanity-check the result.

Heartbeat (1/4.2e+3 your value)0.000239 kcal

Your value1.00 kcal

AA battery charge (2.4× your value)2.39 kcal

Slice of bread (67× your value)66.9 kcal

Daily food intake (2.0e+3× your value)2.01e+3 kcal

Litre of petrol (8.2e+3× your value)8.17e+3 kcal

Other Kilocalorie to Megajoule conversions

2 kcal to MJ 3 kcal to MJ 4 kcal to MJ 5 kcal to MJ 6 kcal to MJ 7 kcal to MJ 8 kcal to MJ

Kilocalorie to Megajoule Conversion Table

Kilocalorie (kcal)	Megajoule (MJ)
0.5	0.002092
1	0.004184
2	0.008368
5	0.02092
10	0.04184
15	0.06276
20	0.08368
25	0.1046
50	0.2092
100	0.4184
250	1.046
500	2.092
1000	4.184

Megajoule to Kilocalorie Conversion Table

Megajoule (MJ)	Kilocalorie (kcal)
0.5	119.502868
1	239.005736
2	478.011472
5	1,195.028681
10	2,390.057361
15	3,585.086042
20	4,780.114723
25	5,975.143403
50	11,950.286807
100	23,900.573614
250	59,751.434034
500	119,502.868069
1000	239,005.736138

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Kilocalorie (kcal)

Energy

Exact conversion

Derived from the joule (1 J = 1 kg·m²/s²). Thermochemical and IT calories, BTU and kWh are exact defined multiples.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

Megajoule (MJ)

Energy

Exact conversion

Derived from the joule (1 J = 1 kg·m²/s²). Thermochemical and IT calories, BTU and kWh are exact defined multiples.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

How to Convert Kilocalorie to Megajoule

To convert from Kilocalorie (kcal) to Megajoule (MJ), multiply the value by 0.004184.

Formula: MJ = kcal × 0.004184

Reverse: kcal = MJ × 239.0057361377

Step-by-Step Example

Start with your value in Kilocalorie. For example: 5 kcal
Multiply by the conversion factor: 5 x 0.004184
The result is: 0.02092 MJ

About Kilocalorie

The kilocalorie (food Calorie) equals 1,000 calories or 4,184 joules. It is the standard unit for food energy content.

Common uses: nutrition, diet, food labeling.

About Megajoule

The megajoule (MJ) is a unit of energy and work. One megajoule equals 1.000000 × 10^+6 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: energy calculations, engineering and science, education.

Frequently Asked Questions

How many Megajoule are in 1 Kilocalorie?

There are exactly 0.004184 Megajoule in 1 Kilocalorie. This means the conversion factor from Kilocalorie to Megajoule is 0.004184.

What is the formula to convert Kilocalorie to Megajoule?

The formula to convert Kilocalorie to Megajoule is: MJ = kcal × 0.004184. For example, to convert 10 Kilocalorie to Megajoule, you would multiply 10 by 0.004184.

What is a Kilocalorie?