Gigajoule to Kiloton of TNT Converter

Energy Converter

27 units available

Decimals:

From

To

0.000239

1 GJ = 0.000239 ktTNT

Formula:

ktTNT = GJ × 0.0002390057

With your value: 1 GJ = 0.00023901 ktTNT

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 Kiloton of TNT conversions

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

Gigajoule to Kiloton of TNT Conversion Table

Gigajoule (GJ)	Kiloton of TNT (ktTNT)
0.5	0.00012
1	0.000239
2	0.000478
5	0.001195
10	0.00239
15	0.003585
20	0.00478
25	0.005975
50	0.01195
100	0.023901
250	0.059751
500	0.119503
1000	0.239006

Kiloton of TNT to Gigajoule Conversion Table

Kiloton of TNT (ktTNT)	Gigajoule (GJ)
0.5	2,092
1	4,184
2	8,368
5	20,920
10	41,840
15	62,760
20	83,680
25	104,600
50	209,200
100	418,400
250	1,046,000
500	2,092,000
1000	4,184,000

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

Kiloton of TNT (ktTNT)

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 Kiloton of TNT

To convert from Gigajoule (GJ) to Kiloton of TNT (ktTNT), multiply the value by 0.0002390057.

Formula: ktTNT = GJ × 0.0002390057

Reverse: GJ = ktTNT × 4,184

Step-by-Step Example

Start with your value in Gigajoule. For example: 5 GJ
Multiply by the conversion factor: 5 x 0.0002390057
The result is: 0.001195 ktTNT

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 Kiloton of TNT

The kiloton of tnt (ktTNT) is a unit of energy and work. One kiloton of tnt equals 4.184000 × 10^+12 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 Kiloton of TNT are in 1 Gigajoule?

There are exactly 0.0002390057 Kiloton of TNT in 1 Gigajoule. This means the conversion factor from Gigajoule to Kiloton of TNT is 0.0002390057.

What is the formula to convert Gigajoule to Kiloton of TNT?

The formula to convert Gigajoule to Kiloton of TNT is: ktTNT = GJ × 0.0002390057. For example, to convert 10 Gigajoule to Kiloton of TNT, you would multiply 10 by 0.0002390057.

What is a Gigajoule?