Kilocalorie to Millijoule Converter

Energy Converter

27 units available

Decimals:

From

To

4,184,000

1 kcal = 4,184,000 mJ

Formula:

mJ = kcal × 4,184,000

With your value: 1 kcal = 4,184,000 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 Millijoule 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 Millijoule Conversion Table

Kilocalorie (kcal)	Millijoule (mJ)
0.5	2,092,000
1	4,184,000
2	8,368,000
5	20,920,000
10	41,840,000
15	62,760,000
20	83,680,000
25	104,600,000
50	209,200,000
100	418,400,000
250	1,046,000,000
500	2,092,000,000
1000	4,184,000,000

Millijoule to Kilocalorie Conversion Table

Millijoule (mJ)	Kilocalorie (kcal)
0.5	1.195029e-7
1	2.390057e-7
2	4.780115e-7
5	1.195029e-6
10	2.390057e-6
15	3.585086e-6
20	4.780115e-6
25	5.975143e-6
50	1.195029e-5
100	2.390057e-5
250	5.975143e-5
500	0.00012
1000	0.000239

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

Millijoule (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 Millijoule

To convert from Kilocalorie (kcal) to Millijoule (mJ), multiply the value by 4,184,000.

Formula: mJ = kcal × 4,184,000

Reverse: kcal = mJ × 2.390057e-7

Step-by-Step Example

Start with your value in Kilocalorie. For example: 5 kcal
Multiply by the conversion factor: 5 x 4,184,000
The result is: 20,920,000 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 Millijoule

The millijoule (mJ) is a unit of energy and work. One millijoule equals 0.001 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 Millijoule are in 1 Kilocalorie?

There are exactly 4,184,000 Millijoule in 1 Kilocalorie. This means the conversion factor from Kilocalorie to Millijoule is 4,184,000.

What is the formula to convert Kilocalorie to Millijoule?

The formula to convert Kilocalorie to Millijoule is: mJ = kcal × 4,184,000. For example, to convert 10 Kilocalorie to Millijoule, you would multiply 10 by 4,184,000.

What is a Kilocalorie?