Calorie (th) to Millijoule Converter

Energy Converter

27 units available

Decimals:

From

To

4,184

1 cal = 4,184 mJ

Formula:

mJ = cal × 4,184

With your value: 1 cal = 4,184 mJ

How big is that?

Everyday references on a logarithmic scale, all expressed in calorie (th) so you can sanity-check the result.

Heartbeat (1/4.2 your value)0.239 cal

Your value1.00 cal

AA battery charge (2.4e+3× your value)2.39e+3 cal

Slice of bread (6.7e+4× your value)6.69e+4 cal

Daily food intake (2.0e+6× your value)2.01e+6 cal

Litre of petrol (8.2e+6× your value)8.17e+6 cal

Other Calorie (th) to Millijoule conversions

2 cal to mJ 3 cal to mJ 4 cal to mJ 5 cal to mJ 6 cal to mJ 7 cal to mJ 8 cal to mJ

Calorie (th) to Millijoule Conversion Table

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

Millijoule to Calorie (th) Conversion Table

Millijoule (mJ)	Calorie (th) (cal)
0.5	0.00012
1	0.000239
2	0.000478
5	0.001195
10	0.00239
15	0.003585
20	0.00478
25	0.005975
50	0.01195
100	0.023901
250	0.059751
500	0.119503
1000	0.239006

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.

Calorie (th) (cal)

Energy

Exact conversion

The thermochemical calorie is exactly 4.184 J.

The International Table calorie (4.1868 J) and the 15 °C calorie differ slightly.

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 Calorie (th) to Millijoule

To convert from Calorie (th) (cal) to Millijoule (mJ), multiply the value by 4,184.

Formula: mJ = cal × 4,184

Reverse: cal = mJ × 0.0002390057

Step-by-Step Example

Start with your value in Calorie (th). For example: 5 cal
Multiply by the conversion factor: 5 x 4,184
The result is: 20,920 mJ

About Calorie (th)

The thermochemical calorie equals 4.184 joules. Not to be confused with the food Calorie (kcal), which equals 1,000 calories.

Common uses: chemistry, nutrition, heating.

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 Calorie (th)?

There are exactly 4,184 Millijoule in 1 Calorie (th). This means the conversion factor from Calorie (th) to Millijoule is 4,184.

What is the formula to convert Calorie (th) to Millijoule?

The formula to convert Calorie (th) to Millijoule is: mJ = cal × 4,184. For example, to convert 10 Calorie (th) to Millijoule, you would multiply 10 by 4,184.

What is a Calorie (th)?