How far is far enough? Set the charge size and see the overpressure at a given distance, plus the standoff where blast pressure falls to the window-breakage threshold.
Blast Standoff / OverpressureLive
cube-root scaling
At 30 m from 10 kg
7.8 kPa
Window breakage
Controls
Presets
83 kPa — Severe structural / lethal
35 kPa — Serious injury, wall collapse
14 kPa — Eardrum rupture risk
3.5 kPa — Window breakage
Peak incident overpressure follows Hopkinson-Cranz cube-root scaling: the scaled distance Z = R/W^(1/3) sets the blast pressure. Rings show injury and damage thresholds. Screening estimate for standoff planning only — consult EOD and published safe-distance tables on scene.
Reading this result: At 30 m from 10 kg the scaled distance is Z ≈ 13.9 m/kg^1/3, giving about 8 kPa (window breakage) — since Z = R/W^(1/3), the same pressure ring scales with the cube root of charge, so 8× the explosive only doubles every safe radius.
Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.
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How it works
Blast overpressure scales by the Hopkinson-Cranz cube-root law: the scaled distance Z = R/W^(1/3) determines peak pressure, so doubling the charge only extends a given pressure ring by about 26 percent. Colored rings mark injury and damage thresholds. This is a screening estimate for standoff planning and training — always defer to EOD technicians and official safe-distance tables on an actual device.
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The math, the assumptions, real-world uses, or a code translation — explained for this exact simulation.
Is this blast standoff distance calculator tool really free?▾
Yes. Blast Standoff / Overpressure runs entirely in your browser using your device's own compute, so local use is free forever. You only pay Compute Tokens if you scale a job to the cloud.
Do I need to install anything?▾
No. Everything runs client-side in a modern browser — no downloads, no license, no account required to start.
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How accurate are the results?▾
The solver uses established numerical methods, but results are for research and educational purposes and should be validated against experiment or professional review before you rely on them.