Blast Radius Calculator
Approximate radius to a selected overpressure threshold using TNT scaled distance.
How to Use This Calculator
1
Enter TNT equivalent
Use mass of TNT (or convert from other explosives to TNT equivalent).
2
Choose overpressure
Select the threshold to estimate distance to. Results are approximate.
Formula
R = Z · W^0.3333333333333333
R is radius in meters, W is TNT equivalent mass in kilograms, Z is the scaled-distance constant for a target overpressure.
Frequently Asked Questions
How accurate is this?
This is a simplified scaling estimate. Real blasts depend on terrain, altitude, confinement, and more.
What about different explosives?
Convert to TNT equivalent energy or mass using a TNT equivalence factor, then use W.