Free · Physics models
Energy Based TNT Mass Equivalent
Compare positive energy-per-mass values using a conventional TNT reference and material mass.
- Formula & worked example
- Private in your browser
- No signup
Calculator inputs
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How to use this calculator
- Enter the known values in the units shown. Results update as you type.
- Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
- Use the worked example to check the method. Reset restores the starting fields.
Private by default
Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.
Formula and method
2 kg at the conventional TNT reference of 4.184 MJ/kg has a 2 kg TNT energy equivalent.
Equivalent mass = source mass × source specific energy / TNT specific energy.
Worked example
Enter these known values and leave the other values blank.
- Weight of explosive (W==exp==)
- 2 kg
- Heat of detonation of explosive (H==exp==)
- 4184000 J/kg
- TNT factor
- 1
- TNT equivalent weight (W==eq==)
- 2 kg of TNT
Assumptions and limitations
- This is an energy accounting comparison. It does not predict blast pressure, damage, geometry or detonation performance.
- The retained TNT reference is 4.184 MJ/kg; preset material energy values are approximate.
- Enter known quantities and clear the unknown to use available inverse branches. Locks retain supplied values. Consistency messages cover fully visible equations; identities with hidden dependencies may require a manual consistency check. Preset values are illustrative approximations, and unit selectors preserve the underlying quantity.
Common questions
How do I solve for a different quantity?
Clear that quantity and supply enough independent known values. Some outputs are one-way or tied to a selected preset, so they cannot determine every input.
References
The calculation equations, inverse formulas, units, and input rules were imported from this source. Bookify provides the interface and equation solver.