Gigajoule to Kilojoule Converter

Energy Converter

27 units available

Decimals:

From

To

1,000,000

1 GJ = 1,000,000 kJ

Formula:

kJ = GJ × 1,000,000

With your value: 1 GJ = 1,000,000 kJ

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 Kilojoule conversions

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

Gigajoule to Kilojoule Conversion Table

Gigajoule (GJ)	Kilojoule (kJ)
0.5	500,000
1	1,000,000
2	2,000,000
5	5,000,000
10	10,000,000
15	15,000,000
20	20,000,000
25	25,000,000
50	50,000,000
100	100,000,000
250	250,000,000
500	500,000,000
1000	1,000,000,000

Kilojoule to Gigajoule Conversion Table

Kilojoule (kJ)	Gigajoule (GJ)
0.5	5.000000e-7
1	1.000000e-6
2	2.000000e-6
5	5.000000e-6
10	1.000000e-5
15	1.500000e-5
20	2.000000e-5
25	2.500000e-5
50	5.000000e-5
100	0.0001
250	0.00025
500	0.0005
1000	0.001

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

Kilojoule (kJ)

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 Kilojoule

To convert from Gigajoule (GJ) to Kilojoule (kJ), multiply the value by 1,000,000.

Formula: kJ = GJ × 1,000,000

Reverse: GJ = kJ × 0.000001

Step-by-Step Example

Start with your value in Gigajoule. For example: 5 GJ
Multiply by the conversion factor: 5 x 1,000,000
The result is: 5,000,000 kJ

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 Kilojoule

The kilojoule (kJ) is a unit of energy and work. One kilojoule equals 1000 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 Kilojoule are in 1 Gigajoule?

There are exactly 1,000,000 Kilojoule in 1 Gigajoule. This means the conversion factor from Gigajoule to Kilojoule is 1,000,000.

What is the formula to convert Gigajoule to Kilojoule?

The formula to convert Gigajoule to Kilojoule is: kJ = GJ × 1,000,000. For example, to convert 10 Gigajoule to Kilojoule, you would multiply 10 by 1,000,000.

What is a Gigajoule?