Calorie (th) to Gigajoule Converter

Energy Converter

27 units available

Decimals:

From

To

4.184000e-9

1 cal = 4.184000e-9 GJ

Formula:

GJ = cal × 4.184000e-9

With your value: 1 cal = 4.184000e-9 GJ

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 Gigajoule conversions

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

Calorie (th) to Gigajoule Conversion Table

Calorie (th) (cal)	Gigajoule (GJ)
0.5	2.092000e-9
1	4.184000e-9
2	8.368000e-9
5	2.092000e-8
10	4.184000e-8
15	6.276000e-8
20	8.368000e-8
25	1.046000e-7
50	2.092000e-7
100	4.184000e-7
250	1.046000e-6
500	2.092000e-6
1000	4.184000e-6

Gigajoule to Calorie (th) Conversion Table

Gigajoule (GJ)	Calorie (th) (cal)
0.5	119,502,868.068834
1	239,005,736.137667
2	478,011,472.275335
5	1,195,028,680.688336
10	2,390,057,361.376673
15	3,585,086,042.06501
20	4,780,114,722.753345
25	5,975,143,403.441683
50	11,950,286,806.883366
100	23,900,573,613.76673
250	59,751,434,034.416824
500	119,502,868,068.83365
1000	239,005,736,137.6673

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

Gigajoule (GJ)

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 Gigajoule

To convert from Calorie (th) (cal) to Gigajoule (GJ), multiply the value by 4.184000e-9.

Formula: GJ = cal × 4.184000e-9

Reverse: cal = GJ × 239,005,736.1376673

Step-by-Step Example

Start with your value in Calorie (th). For example: 5 cal
Multiply by the conversion factor: 5 x 4.184000e-9
The result is: 2.092000e-8 GJ

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 Gigajoule

The gigajoule (GJ) is a unit of energy and work. One gigajoule equals 1.000000 × 10^+9 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 Gigajoule are in 1 Calorie (th)?

There are exactly 4.184000e-9 Gigajoule in 1 Calorie (th). This means the conversion factor from Calorie (th) to Gigajoule is 4.184000e-9.

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

The formula to convert Calorie (th) to Gigajoule is: GJ = cal × 4.184000e-9. For example, to convert 10 Calorie (th) to Gigajoule, you would multiply 10 by 4.184000e-9.

What is a Calorie (th)?