Nuclear Weapons Calculator (2023)

Nuclear Weapons Calculator

Press Detonate Button And View Results.

Nuclear Weapon
Effects Calculator

This page will calculate blast effects for nuclear weapons of arbitrary yield, based on the scaling laws printed in Nuclear Weapons FAQ, with help from Weapon Effects v2.1 -- 21 December 1984 by Horizons Technologies for the Defense Nuclear Agency to compute more accurate tables.For the purposes of thermal fluence calculations, visibility has been fixed at 12.6 km, which is typical clear day on average in the areas most likely to be nuked. (1000 kilotons = 1 Megaton)
Green = User input boxes.
Red = System output boxes.

Thermal Pulse:

  • 100~ cal/cm2 and 23.5 PSI: Human Shadow impressions on the steps of the Sumito Bank, some 250~m from hypocenter at Hiroshima.
  • 45~ cal/cm2: Near-black roof tiles facing the hypocenter at Hiroshima blistered at this fluence. In laboratory tests, this was found to equate to a surface temperature of 1,800 degrees Celsius for less than four seconds.
  • 34~ cal/cm2: Light-on-dark shadows of railings on pavement at Yorozuyo Bridge, 880~m from hypocenter at Hiroshima.
  • 25~ cal/cm2: Black Maple burns, considerable danger of wooden building ignition.
  • 15~ cal/cm2: US Khaki/Cotton Summer Uniform (c.1954) burns.
    &nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbspThreshold ignition of just about every combustible -- it probably will burn when exposed to this.
  • 10~ cal/cm2: White paper burns.
  • 8.5~ cal/cm2: Upholstery on chairs inside buildings charred at this fluence. Also shadows of valves were flash-burned onto adjacent painted surfaces in Hiroshima.
  • 5 to 6~ cal/cm2: Wooden Poles exposed to this fluence were heavily charred and likely were at or near ignition, but had any smoldering fires extinguished by the blast wave at Hiroshima. Brown Paper also burns. Possible danger of forest fires in dry season.
  • 3 to 3.4~ cal/cm2: Fabrics, Utility Poles, trees, and wooden posts charred and blackened at this fluence at Hiroshima.


  • 1~ PSI: Aircraft can generally fly, but performance may be restricted due to damage.
  • 1.7~ PSI: Typical American Wood-Framed and Unreinforced Brick Residential Housing moderately damaged with windows blown in, and repair needed but structurally stable enough to be used as a shelter.
  • 2~ PSI: "Very Few" trees blown down. Area passable to vehicles.
    &nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbspField maintenance needed to restore aircraft to flight status.
  • 3~ PSI: 30% of trees blown down. Remainder have some branches blown off. Area passable to vehicles after extensive clearing.
    &nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbspMajor Depot level maintenance needed to restore aircraft to operational status.
  • 5~ PSI: Typical American Wood-Framed and Unreinforced Brick Residential Housing blown via blast into rubble piles.
    &nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbspReinforced concrete residential structures survive with blown out windows.
    &nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbspWooden utility poles generally are snapped in half or severely damaged.
    &nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp90% of trees blown down, 10% survivors denuded of branches. Area impassable to vehicles and very difficult on foot.

How Far Away Would You Need to Be to Survive a Nuclear Blast?

There is no clear-cut impact of a single nuclear bomb, because it depends on a whole lot of things, including the weather on the day it's dropped, the time of day it's detonated, the geographical layout of where it hits, and whether it explodes on the ground or in the air.

But generally speaking, there are some predictable stages of a nuclear bomb blast.

Approximately 35 percent of the energy of a nuclear blast is released in the form of thermal radiation. And seeing as thermal radiation travels at approximately the speed of light, the first thing that will hit you is a flash of blinding light and heat.

The light itself is enough to cause something called flash blindness - a temporary form of blindness that can last a few minutes.

A 1 megaton bomb , which is 80 times larger than the bomb detonated over Hiroshima, but much smaller than many modern nuclear weapons, people up to 21 km (13 miles) away would experience flash blindness on a clear day, and people up to 85 km (52.8 miles) away would be temporarily blinded on a clear night.

Heat is an issue for those closer to the blast. Mild, first degree burns can occur up to 11 km (6.8 miles) away, and third degree burns - the kind that destroy and blister skin tissue - could affect anyone up to 8 km (5 miles) away.

Third degree burns that cover more than 24 percent of the body will likely be fatal if people don't receive medical care immediately.

Those distances are variable, depending not just on the weather, but also on what you're wearing - white clothes can reflect some of the energy of a blast, while darker clothes will absorb it.

That's unlikely to make much difference for those unfortunate enough to be at the centre of the explosion, though.

The temperatures near the site of the bomb blast during the Hiroshima explosion were estimated to be 300,000 degrees Celsius (540,000 degrees Fahrenheit) - which is 300 times hotter than the temperature bodies are cremated at, so humans were almost instantly reduced to their most basic minerals.

But for those slightly further away from the centre of the blast, that's not what's most likely to kill you.

most of the energy released in a nuclear explosion is in the blast, which drives air away from the site of the explosion, creating sudden changes in air pressure that can crush objects and knock down buildings.

Within a 6-km (3.7-mile) radius of a 1-megaton bomb, blast waves will produce 180 tonnes of force on the walls of all two-storey buildings, and wind speeds of 255 km/h (158 mph).

In a 1-km (0.6-mile) radius, the peak pressure is four times that amount, and wind speeds can reach 756 km/h (470 mph).

Technically, humans can withstand that much pressure, but most people would be killed by falling buildings.

If you somehow survive all of that, there's still the radiation poisoning to deal with - and the nuclear fallout. (Read This If You Are Fearful)

What’s The Best Way To Survive A Nuclear Attack?

Thebest way to survive a nuclear attackis to avoid one in the first place.Don’t live in or near a major city.

Maps of the state-by-state nuclear threats and survival.

State Maps and Information for Nuclear Survival

Keep This In Mind.

You can prepare for a nuclear blast but don't count on your survival.

If it is God's will and its you time to die, you will.

It is God who determines when you will die.

Being killed by a nuclear blast is the least of your problems if your not saved by faith in Jesus Christ.

You may not have time to build or get to a fallout shelter but you do have time to say a prayer in faith asking God to save you for Jesus sake.

In the bible it says a man prayed a prayer that said, "God be merciful to me a sinner."

Luke 18: 1-43

18:10 Two men went up into the temple to pray; the one a Pharisee, and the other a publican.

18:11 The Pharisee stood and prayed thus with himself, God, I thank thee, that I am not as other men are, extortioners, unjust, adulterers, or even as this publican.

18:12 I fast twice in the week, I give tithes of all that I possess.

18:13 And the publican, standing afar off, would not lift up so much as his eyes unto heaven, but smote upon his breast, saying, God be merciful to me a sinner.

18:14 I tell you, this man went down to his house justified rather than the other: for every one that exalteth himself shall be abased; and he that humbleth himself shall be exalted.

Find out how by reading the Bible. (Online Version Of KJV Bible.)

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