Megaton of TNT to Gigajoule Converter

Energy Converter

27 units available

Decimals:

From

To

4,184,000

1 MtTNT = 4,184,000 GJ

Formula:

GJ = MtTNT × 4,184,000

With your value: 1 MtTNT = 4,184,000 GJ

How big is that?

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

Heartbeat (1/4.2e+15 your value)2.39e-16 MtTNT

AA battery charge (1/4.2e+11 your value)2.39e-12 MtTNT

Slice of bread (1/1.5e+10 your value)6.69e-11 MtTNT

Daily food intake (1/5.0e+8 your value)2.01e-9 MtTNT

Litre of petrol (1/1.2e+8 your value)8.17e-9 MtTNT

Your value1.00 MtTNT

Other Megaton of TNT to Gigajoule conversions

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

Megaton of TNT to Gigajoule Conversion Table

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

Gigajoule to Megaton of TNT Conversion Table

Gigajoule (GJ)	Megaton of TNT (MtTNT)
0.5	1.195029e-7
1	2.390057e-7
2	4.780115e-7
5	1.195029e-6
10	2.390057e-6
15	3.585086e-6
20	4.780115e-6
25	5.975143e-6
50	1.195029e-5
100	2.390057e-5
250	5.975143e-5
500	0.00012
1000	0.000239

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.

Megaton of TNT (MtTNT)

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 Megaton of TNT to Gigajoule

To convert from Megaton of TNT (MtTNT) to Gigajoule (GJ), multiply the value by 4,184,000.

Formula: GJ = MtTNT × 4,184,000

Reverse: MtTNT = GJ × 2.390057e-7

Step-by-Step Example

Start with your value in Megaton of TNT. For example: 5 MtTNT
Multiply by the conversion factor: 5 x 4,184,000
The result is: 20,920,000 GJ

About Megaton of TNT

The megaton of tnt (MtTNT) is a unit of energy and work. One megaton of tnt equals 4.184000 × 10^+15 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 Megaton of TNT?

There are exactly 4,184,000 Gigajoule in 1 Megaton of TNT. This means the conversion factor from Megaton of TNT to Gigajoule is 4,184,000.

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

The formula to convert Megaton of TNT to Gigajoule is: GJ = MtTNT × 4,184,000. For example, to convert 10 Megaton of TNT to Gigajoule, you would multiply 10 by 4,184,000.

What is a Megaton of TNT?