☢ Nuclear Fallout Calculator
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Nuclear Fallout Calculator Explained: Science Behind the Tool

The Science Behind Nuclear Impact Calculators

Nuclear fallout calculators use well-established physics models derived from decades of nuclear testing data. Our tool models the effects of a 2 megaton thermonuclear weapon — roughly the yield of a modern strategic warhead.

Blast Effects Modeling

The primary destructive force comes from the blast wave. Overpressure (measured in psi) determines structural damage:

  • 20+ psi — Reinforced concrete structures destroyed
  • 5-20 psi — All residential buildings collapse
  • 1-2 psi — Windows shatter, moderate structural damage

    • Blast radius scales with the cube root of yield. A 2 megaton weapon has roughly 1.26× the blast radius of a 1 megaton weapon.

    Thermal Radiation

    The nuclear fireball reaches temperatures exceeding 10 million °C. Thermal radiation causes burns at distances far exceeding the blast wave:

  • Third-degree burns: Up to 13.5 km (surface) or 18.8 km (airburst)
  • Fires and firestorms: Can ignite materials across the thermal zone
  • Flash blindness: Temporary or permanent damage to eyesight

    • Radioactive Fallout

    Surface bursts dig into the earth, mixing radioactive material with soil and debris. This fallout rises into the mushroom cloud and descends downwind over hours to days.

    Air bursts produce significantly less fallout because the fireball doesn't contact the ground.

    How Our Calculator Differs

    Unlike simple radius calculators, our tool provides:

  • Personalized survival rates based on your exact distance
  • Dynamic blast zone visualization on a real map
  • Surface vs. air burst comparison
  • Detailed effect descriptions for each zone

    • Check your nuclear fallout risk

    Use our free calculator to see your survival rate

    Open Calculator ☢