Kiloton of TNT to Gigajoule Converter

Energy Converter

27 units available

Decimals:

From

To

4,184

1 ktTNT = 4,184 GJ

Formula:

GJ = ktTNT × 4,184

With your value: 1 ktTNT = 4,184 GJ

How big is that?

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

Heartbeat (1/4.2e+12 your value)2.39e-13 ktTNT

AA battery charge (1/4.2e+8 your value)2.39e-9 ktTNT

Slice of bread (1/1.5e+7 your value)6.69e-8 ktTNT

Daily food intake (1/5.0e+5 your value)0.00000201 ktTNT

Litre of petrol (1/1.2e+5 your value)0.00000817 ktTNT

Your value1.00 ktTNT

Other Kiloton of TNT to Gigajoule conversions

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

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

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

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.

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

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 Kiloton of TNT to Gigajoule

To convert from Kiloton of TNT (ktTNT) to Gigajoule (GJ), multiply the value by 4,184.

Formula: GJ = ktTNT × 4,184

Reverse: ktTNT = GJ × 0.0002390057

Step-by-Step Example

Start with your value in Kiloton of TNT. For example: 5 ktTNT
Multiply by the conversion factor: 5 x 4,184
The result is: 20,920 GJ

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.

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 Kiloton of TNT?

There are exactly 4,184 Gigajoule in 1 Kiloton of TNT. This means the conversion factor from Kiloton of TNT to Gigajoule is 4,184.

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

The formula to convert Kiloton of TNT to Gigajoule is: GJ = ktTNT × 4,184. For example, to convert 10 Kiloton of TNT to Gigajoule, you would multiply 10 by 4,184.

What is a Kiloton of TNT?