Blast Radius Calculator

Your details

Select the primary explosive. TNT-equivalence (RE factor) is applied automatically.
Mass of the actual explosive (not TNT-equivalent). The calculator converts it for you.
kg
Enter a specific distance to get the peak overpressure at that point. Leave at 0 to skip.
m
Severe collapse radiusModerate device
8.4

Hopkinson-Cranz R = 1.8 * W^(1/3)

TNT-equivalent mass100
Fireball radius2.3
Moderate damage radius16.2
Light damage radius29.2
Injury threshold radius51.1
Overpressure at standoff10.5
Overpressure (psi)1.52
_distUnitm
_massUnitkg
Fireball2.3
Severe collapse8.4
Moderate damage16.2
Light damage29.2
Injury threshold51.1

Severe collapse zone: 8.4 m from ground zero.

  • 100.0 kg of TNT equals 100.0 kg TNT-equivalent (RE factor 1.00).
  • Fireball radius: 2.3 m. Severe collapse zone extends to 8.4 m.
  • Window breakage and minor injuries are possible up to 29.2 m from the detonation point.
  • The outdoor injury threshold (lung damage risk) extends to roughly 51.1 m.
  • At your standoff of 50 m, peak overpressure is 10.5 kPa (1.52 psi).

Next stepThese results assume an unconfined, surface-detonated hemispherical charge in open air at sea level. Confined spaces, underground detonations, or elevated charges will produce significantly different effects. Always consult a qualified explosives engineer for safety-critical standoff distances.

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