Calorie (th) to Megajoule Converter

Energy Converter

27 units available

Decimals:

From

To

4.184000e-6

1 cal = 4.184000e-6 MJ

Formula:

MJ = cal × 0.000004184

With your value: 1 cal = 4.184000e-6 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 Megajoule 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 Megajoule Conversion Table

Calorie (th) (cal)	Megajoule (MJ)
0.5	2.092000e-6
1	4.184000e-6
2	8.368000e-6
5	2.092000e-5
10	4.184000e-5
15	6.276000e-5
20	8.368000e-5
25	0.000105
50	0.000209
100	0.000418
250	0.001046
500	0.002092
1000	0.004184

Megajoule to Calorie (th) Conversion Table

Megajoule (MJ)	Calorie (th) (cal)
0.5	119,502.868069
1	239,005.736138
2	478,011.472275
5	1,195,028.680688
10	2,390,057.361377
15	3,585,086.042065
20	4,780,114.722753
25	5,975,143.403442
50	11,950,286.806883
100	23,900,573.613767
250	59,751,434.034417
500	119,502,868.068834
1000	239,005,736.137667

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

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 Calorie (th) to Megajoule

To convert from Calorie (th) (cal) to Megajoule (MJ), multiply the value by 4.184000e-6.

Formula: MJ = cal × 0.000004184

Reverse: cal = MJ × 239,005.7361376673

Step-by-Step Example

Start with your value in Calorie (th). For example: 5 cal
Multiply by the conversion factor: 5 x 4.184000e-6
The result is: 2.092000e-5 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 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 Calorie (th)?

There are exactly 4.184000e-6 Megajoule in 1 Calorie (th). This means the conversion factor from Calorie (th) to Megajoule is 4.184000e-6.

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

The formula to convert Calorie (th) to Megajoule is: MJ = cal × 0.000004184. For example, to convert 10 Calorie (th) to Megajoule, you would multiply 10 by 4.184000e-6.

What is a Calorie (th)?