Tons of TNT to Gigajoules
Convert tons of TNT equivalent to gigajoules and back. It is how earthquake energy and blast size get compared, and the figure behind headlines that say “equal to so many tons of TNT”.
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Common values
Formula
GJ = t TNT × 4.184
One ton of TNT is defined as exactly 4.184 GJ. That is a fixed convention, not a measured heat of detonation.
Frequently asked questions
Q. How many GJ is 1 t TNT?
1 t TNT is 4.184 GJ, and 10 t TNT is 41.84 GJ. Type any value in the box above to convert instantly.
Q. And how many t TNT is 1 GJ?
1 GJ is 0.239 t TNT. This converter works both ways, so typing in the right box updates the left one.
Q. Where is this unit used?
One ton of TNT is defined as exactly 4.184 GJ. That is a fixed convention, not a measured heat of detonation.
Other converters
Traditional units (geun, doe, majigi and so on) vary by region and product.