Gigajoule to Kilocalorie Converter

Energy Converter

27 units available

Decimals:

From

To

239,005.736138

1 GJ = 239,005.736138 kcal

Formula:

kcal = GJ × 239,005.7361376673

With your value: 1 GJ = 239,005.73613767 kcal

How big is that?

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

Heartbeat (1/1.0e+9 your value)1.00e-9 GJ

AA battery charge (1/1.0e+5 your value)0.0000100 GJ

Slice of bread (1/3.6e+3 your value)0.000280 GJ

Daily food intake (1/1.2e+2 your value)0.00840 GJ

Litre of petrol (1/29 your value)0.0342 GJ

Your value1.00 GJ

Other Gigajoule to Kilocalorie conversions

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

Gigajoule to Kilocalorie Conversion Table

Gigajoule (GJ)	Kilocalorie (kcal)
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

Kilocalorie to Gigajoule Conversion Table

Kilocalorie (kcal)	Gigajoule (GJ)
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

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.

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

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

How to Convert Gigajoule to Kilocalorie

To convert from Gigajoule (GJ) to Kilocalorie (kcal), multiply the value by 239,005.7361376673.

Formula: kcal = GJ × 239,005.7361376673

Reverse: GJ = kcal × 0.000004184

Step-by-Step Example

Start with your value in Gigajoule. For example: 5 GJ
Multiply by the conversion factor: 5 x 239,005.7361376673
The result is: 1,195,028.680688 kcal

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.

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.

Frequently Asked Questions

How many Kilocalorie are in 1 Gigajoule?

There are exactly 239,005.7361376673 Kilocalorie in 1 Gigajoule. This means the conversion factor from Gigajoule to Kilocalorie is 239,005.7361376673.

What is the formula to convert Gigajoule to Kilocalorie?

The formula to convert Gigajoule to Kilocalorie is: kcal = GJ × 239,005.7361376673. For example, to convert 10 Gigajoule to Kilocalorie, you would multiply 10 by 239,005.7361376673.

What is a Gigajoule?