Kilocalorie to Gigajoule Converter

Energy Converter

27 units available

Decimals:

From

To

4.184000e-6

1 kcal = 4.184000e-6 GJ

Formula:

GJ = kcal × 0.000004184

With your value: 1 kcal = 4.184000e-6 GJ

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 Gigajoule conversions

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

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

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

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

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 Kilocalorie to Gigajoule

To convert from Kilocalorie (kcal) to Gigajoule (GJ), multiply the value by 4.184000e-6.

Formula: GJ = kcal × 0.000004184

Reverse: kcal = GJ × 239,005.7361376673

Step-by-Step Example

Start with your value in Kilocalorie. For example: 5 kcal
Multiply by the conversion factor: 5 x 4.184000e-6
The result is: 2.092000e-5 GJ

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 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 Kilocalorie?

There are exactly 4.184000e-6 Gigajoule in 1 Kilocalorie. This means the conversion factor from Kilocalorie to Gigajoule is 4.184000e-6.

What is the formula to convert Kilocalorie to Gigajoule?

The formula to convert Kilocalorie to Gigajoule is: GJ = kcal × 0.000004184. For example, to convert 10 Kilocalorie to Gigajoule, you would multiply 10 by 4.184000e-6.

What is a Kilocalorie?