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TNT-equivalent mass

Convert an explosive charge to its equivalent TNT mass so the scaled-distance and overpressure tools (which assume TNT) apply.

Civil-protection / accidental-explosion scope only (UFC 3-340-02, public release). Weapon-effects and penetration calculations are out of scope.

TNT equivalence is NOT a single constant: pressure- and impulse-based factors differ and vary with scaled distance; the literature reports a 20–50% spread. Treat the result as a preliminary estimate. Factors: AASTP-1 / IATG 01.80 / UFC 3-340-02.

Inputs

Results

Factor used—
Equivalent TNT— kg

Citations

AASTP-1Equivalent TNT = mass × factor. Factors from IATG 01.80:2021 Table 10 (AASTP-1 Table 5-2); UFC 3-340-02 Table 2-1.

Engine: blast.js v0.1.0 · Code pack: BLAST-TNTEQ-AASTP1.v1 · Date:

Scaled-distance tool

Preliminary calculation tool. Results are for preliminary sizing and cross-check only. Final design, sealed responsibility, and permit submissions require the full official text of the referenced regulations and the review of a licensed engineer.