Blast Radius Calculator
Calculate safe distances from explosive detonations using Hopkinson-Cranz scaling law
SAFETY WARNING
This calculator provides indicative distances only. Areas outside the calculated radius remain UNSAFE. Extreme caution is advised. This tool is for educational purposes only.
Calculate Blast Radius
Total mass of the explosive material (TNT equivalent)
Type of explosive configuration
Blast Radius Results
Formula used: D = 130 × W^(1/3)
Explosive mass: 0.000 kg TNT equivalent
Scaled distance: 0.00 m/kg^(1/3)
Safety Analysis
Example Calculation
Example: 0.5 kg bare exposed TNT
Calculation: D = 130 × (0.5)^(1/3) = 130 × 0.794 = 103.2 m
Result: Safe distance approximately 103 meters from detonation point
Hopkinson-Cranz Scaling Law
Bare Explosives
D = 130 × W^(1/3)
Direct exposure formula
Fragmented (Public)
D = 634 × W^(1/6)
Public access areas
Fragmented (Restricted)
D = 444 × W^(1/6)
Restricted access areas
Safety Guidelines
Calculated distance is minimum safe distance
Areas outside radius remain unsafe
Distance assumes no fragment protection
For educational purposes only
Always maintain maximum distance possible
Understanding Blast Radius and Explosions
What is Blast Radius?
Blast radius is the distance from an explosion beyond which the effects are significantly reduced. It's calculated using the Hopkinson-Cranz scaling law, which relates explosive weight to safe distances.
Blast Wave Physics
- •Shock wave originates from detonation point
- •Pressure wave travels spherically outward
- •Intensity decreases with distance cubed
- •Fragment dispersion follows ballistic trajectories
Hopkinson-Cranz Law
W₁/W₂ = (R₁/R₂)³
- W: Mass of explosive (TNT equivalent)
- R: Distance from explosion center
- Z: Scaled distance = R/W^(1/3)
Warning: These calculations provide minimum safe distances. Actual safety requires much greater distances and professional assessment.