Nuclear Blast Effects Calculator

Estimate fireball, blast wave, thermal radiation, and fallout effects at your distance from a nuclear detonation.

Last reviewed: April 2026
Scenario Setup

Target, Yield, Burst, Distance

Keep the map dominant. Expand this strip only when you need to edit the current scenario.

Expand setup
Target New York, USA Yield 100 kt Burst Airburst Distance 5 mi

Type any location above, pick a preset, or click the map to reposition ground zero.

Search powered by Nominatim (OpenStreetMap).

kt
mi
Scenario Stage

Map Reveal

Use the map as the main workspace, then arm and run from the control band below it. After detonation, hover the colored bands for zone-specific consequences.

Target: Custom target Mode: Airburst Yield: 100 kt Plume: Minimal local fallout
Preview Armed

Preview keeps the target marker editable. Move ground zero if needed, then arm the scenario to use the reveal.

Launch Sequence Run Controls
Awaiting Arm
Safety Interlocks

Move the target if needed, arm the scenario, then run the reveal.

Outcome Summary Assessment
Overall Assessment
Awaiting Simulation
Run a scenario to reveal the full blast map, then use the summary cards below to scan the key hazards.
Blast Awaiting reveal
Thermal Awaiting reveal
Radiation Awaiting reveal
Fallout Awaiting reveal
Simulation Phase Preview Armed
Queue Status No Queue

Use this stage to place ground zero, run the reveal, then inspect the colored bands for damage, injury, and fallout notes.

Legend Effect Bands
Map keyed
Timeline Sequence Markers
Live timing
0 s Flash Thermal pulse arrives immediately.
0 s Fireball Visible fireball duration.
0 s Blast Front Shock wave reaches your distance.
1 hr Fallout Window First hour usually matters most after a surface burst.
Detailed Effects and Hazard Board
Fireball Radius ---
Open details
Overpressure ---
Open details
Thermal Fluence ---
Open details
Blast Wind Speed ---
Open details
Blast Arrival Time ---
Open details
Initial Radiation Dose ---
Open details
Fallout Assessment ---
Open details
Shelter Recommendation Open guidance
Open details
Live Hazard Board Open meters
Expand board
Hazard Board

Exposure Profile

Watch which effect is actually driving the current scenario as you change the setup.

Blast0%
Awaiting calculation.
Thermal0%
Awaiting calculation.
Prompt Radiation0%
Awaiting calculation.
Fallout0%
Awaiting calculation.
Scenario Stack

Quick Variants

Preview Armed No Queue

Save a few city-and-yield combinations as quick chips before you run the stage.

Profiles
Advanced Controls
mph
Expanded Analysis

Chart and Detailed Table

The map now stays in the main interaction loop. Use these drawers only when you want the chart or the full radius table.

Zone Comparison Chart
Detailed Effect Radii Table
Effect Radius Description
Important Disclaimer: The information provided in this calculator is intended for general educational purposes only. It isn't a substitute for professional advice. Always consult with appropriate experts before making any decisions related to survival strategies.

About the Nuclear Blast Effects Calculator

The Nuclear Blast Calculator is a powerful tool designed to help individuals assess the potential impact of a nuclear blast on their environment and prepare accordingly. This calculator takes into account factors such as blast radius, fallout, and distance from the blast site to provide a comprehensive analysis. By understanding these factors, individuals can take necessary precautions to ensure their safety and survival.

Real-World Applications

The Nuclear Blast Calculator has numerous real-world applications. For instance, individuals living in areas that are at risk of nuclear attacks can use this calculator to assess the potential impact of a blast on their homes and neighborhoods. This information can help them make informed decisions about evacuation plans, emergency preparedness, and sheltering in place.

Additionally, the Nuclear Blast Calculator can be used by emergency responders and government officials to develop effective response strategies. By understanding the potential impact of a nuclear blast, they can better allocate resources, plan evacuation routes, and provide assistance to those in need.

Common Mistakes

One common mistake when using the Nuclear Blast Calculator isn't understanding the limitations of the tool. The calculator provides a general analysis and doesn't account for all factors that may impact the outcome of a nuclear blast. For example, the calculator may not take into account the specific characteristics of the blast, such as the type of weapon used or the weather conditions at the time of the blast.

Another common mistake isn't taking the results of the calculator seriously. The results of the Nuclear Blast Calculator should be taken seriously and used as a guide for emergency preparedness. While the calculator provides a general analysis, it's important to be prepared for the worst-case scenario and have a plan in place for survival.

Examples

Example 1: Assessing the Impact of a Nuclear Blast

Let's say an individual lives in a city that's at risk of a nuclear attack. They use the Nuclear Blast Calculator to assess the potential impact of a blast on their home. The calculator shows that the blast radius is 1 mile and that there will be significant fallout in a 5-mile radius. Based on this information, the individual decides to evacuate their home and seek shelter in a nearby building.

Example 2: Developing an Emergency Response Plan

Emergency responders use the Nuclear Blast Calculator to develop an effective response plan for a potential nuclear attack. The calculator shows that the blast radius is 5 miles and that there will be significant fallout in a 10-mile radius. Based on this information, the emergency responders develop a plan to evacuate the affected areas, provide assistance to those in need, and allocate resources to support the response effort.

Example 3: Understanding the Limitations of the Calculator

Let's say an individual lives in a city that is at risk of a nuclear attack. They use the Nuclear Blast Calculator to assess the potential impact of a blast on their home. The calculator shows that the blast radius is 1 mile and that there will be significant fallout in a 5-mile radius. However, the individual doesn't take the results of the calculator seriously and decides to stay in their home. This decision could be catastrophic if a nuclear blast occurs, as the individual would be exposed to significant radiation and potential injuries.

FAQs

  • Q1: How does the Nuclear Blast Calculator work?

    The Nuclear Blast Calculator takes into account factors such as blast radius, fallout, and distance from the blast site to provide a comprehensive analysis. The calculator uses this information to assess the potential impact of a nuclear blast on the environment and provide guidance on emergency preparedness.

  • Q2: What are some limitations of the Nuclear Blast Calculator?

    The Nuclear Blast Calculator provides a general analysis and does not account for all factors that may impact the outcome of a nuclear blast. For example, the calculator may not take into account the specific characteristics of the blast, such as the type of weapon used or the weather conditions at the time of the blast.

  • Q3: How can I use the Nuclear Blast Calculator to prepare for a potential nuclear attack?

    The Nuclear Blast Calculator can be used to assess the potential impact of a nuclear blast on your environment and prepare accordingly. By understanding the results of the calculator, you can develop an emergency plan, evacuate your home, and seek shelter in a nearby building. It's important to take the results of the calculator seriously and be prepared for the worst-case scenario.

  • Q4: How accurate is the Nuclear Blast Calculator?

    The Nuclear Blast Calculator is a powerful tool, but it isn't 100% accurate. The calculator provides a general analysis and doesn't account for all factors that may impact the outcome of a nuclear blast. For example, the calculator may not take into account the specific characteristics of the blast, such as the type of weapon used or the weather conditions at the time of the blast.

  • Q5: Can I use the Nuclear Blast Calculator to assess the impact of a nuclear bomb?

    The Nuclear Blast Calculator is designed to assess the impact of a nuclear blast, not a nuclear bomb. A nuclear bomb is a much more powerful weapon than a nuclear blast, and the results of the Nuclear Blast Calculator may not accurately reflect the impact of a nuclear bomb.

How to Use Nuclear Blast Effects Calculator

  1. Select a target. Pick a city from the dropdown or click anywhere on the map to place a custom ground zero.
  2. Set yield and burst type. Choose the yield in kilotons and whether the detonation is an airburst (optimised altitude) or a surface burst.
  3. Enter your distance. Specify how far you're from ground zero, in miles or kilometres.
  4. Run the simulation. Arm and run the scenario to reveal the effect rings, timeline, and assessment breakdown.

What the Calculator Means

  • Fireball radius - the radius of the initial hot fireball; everything inside is vaporised.
  • Blast overpressure - the pressure wave that collapses buildings and causes blunt-force injury.
  • Thermal radiation - the heat pulse that causes flash burns and ignites secondary fires.
  • Fallout - the radioactive particulate that can pose downwind health risks after a surface burst.

Formula, Assumptions, and Logic

The calculator uses published yield-scaling models for fireball, overpressure, and thermal radiation. Key simplifying assumptions:

  • Standard atmospheric conditions (no inversions, no rain-out).
  • Uniform terrain - no shielding from hills, buildings, or forests.
  • Immediate detonation at the specified altitude or on the ground.

Practical Tips, Edge Cases, and Limitations

  • Treat this as an educational visualisation, not a survival-planning tool.
  • Real-world effects vary significantly with weather, terrain, and building stock.
  • The fallout model assumes a single steady wind; complex wind fields will distort the plume.
  • Short-wavelength thermal effects degrade rapidly through haze, smoke, or clouds.

Frequently Asked Questions

The Nuclear Blast Calculator takes into account factors such as blast radius, fallout, and distance from the blast site to provide a comprehensive analysis. The calculator uses this information to assess the potential impact of a nuclear blast on the environment and provide guidance on emergency preparedness.
The Nuclear Blast Calculator provides a general analysis and doesn't account for all factors that may impact the outcome of a nuclear blast. For example, the calculator may not take into account the specific characteristics of the blast, such as the type of weapon used or the weather conditions at the time of the blast.
The Nuclear Blast Calculator can be used to assess the potential impact of a nuclear blast on your environment and prepare accordingly. By understanding the results of the calculator, you can develop an emergency plan, evacuate your home, and seek shelter in a nearby building. It's important to take the results of the calculator seriously and be prepared for the worst-case scenario.
The Nuclear Blast Calculator is a powerful tool, but it isn't 100% accurate. The calculator provides a general analysis and does not account for all factors that may impact the outcome of a nuclear blast. For example, the calculator may not take into account the specific characteristics of the blast, such as the type of weapon used or the weather conditions at the time of the blast.
The Nuclear Blast Calculator is designed to assess the impact of a nuclear blast, not a nuclear bomb. A nuclear bomb is a much more powerful weapon than a nuclear blast, and the results of the Nuclear Blast Calculator may not accurately reflect the impact of a nuclear bomb.