Kilograms of TNT to Megatons of TNT
kgTNT
MtTNT
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Quick Reference Table (Kilograms of TNT to Megatons of TNT)
| Kilograms of TNT (kgTNT) | Megatons of TNT (MtTNT) |
|---|---|
| 0.1 | 0.0000000001 |
| 0.5 | 0.0000000005 |
| 1 | 0.000000001 |
| 5 | 0.000000005 |
| 10 | 0.00000001 |
| 100 | 0.0000001 |
| 2,000 | 0.000002 |
About Kilograms of TNT (kgTNT)
A kilogram of TNT (kgTNT) equals 4,184,000 joules and is used to express the energy of larger explosive charges, mining blasts, and the energy comparisons for industrial accidents or meteor impacts. One kilogram of TNT is roughly the explosive power of a typical anti-personnel mine or a small improvised explosive device. The unit bridges the gap between gram-scale charges and the ton-scale yields of large munitions.
A typical artillery shell contains 1–5 kg of explosive equivalent. The 1995 Oklahoma City bombing used about 2,000 kg of TNT equivalent in ammonium nitrate.
About Megatons of TNT (MtTNT)
A megaton of TNT equals 4.184 × 10¹⁵ joules — one million metric tons of TNT — and is the unit used to quantify thermonuclear weapon yields and very large natural catastrophic events. Modern strategic nuclear warheads typically yield 0.1–1 megaton; the largest ever detonated, the Soviet Tsar Bomba (1961), yielded approximately 50 megatons. The energy of the asteroid impact that caused the Cretaceous–Paleogene extinction is estimated at around 100 million megatons.
The US W88 thermonuclear warhead yields approximately 0.475 megatons. The Tsar Bomba, the largest nuclear weapon ever tested, yielded about 50 megatons.
Kilograms of TNT – Frequently Asked Questions
How much destruction can one kilogram of TNT cause?
One kilogram of TNT releases 4.184 MJ — enough to shatter windows within several meters and cause serious injury at close range. In open air, 1 kg of TNT produces a blast overpressure lethal to humans within about 2–3 meters. The effect depends heavily on confinement: the same charge inside a vehicle or building is far more destructive than in open ground.
What everyday objects have the energy equivalent of one kilogram of TNT?
One kilogram of TNT (4.184 MJ) is roughly the kinetic energy of a 1,500 kg car traveling at 75 km/h, or the energy stored in about 120 mL (half a cup) of petrol. It is also the chemical energy in roughly one large meal (1,000 kcal). The difference is that TNT releases its energy in microseconds rather than hours.
How is kilograms of TNT used in mining and demolition?
Mining engineers express blast charge sizes in kg of TNT equivalent to standardize across different commercial explosives. A typical quarry blast hole uses 5–50 kg of ANFO (ammonium nitrate/fuel oil), equivalent to roughly 4–37 kg TNT. Building demolition charges range from 10 to several hundred kg TNT equivalent, carefully placed at structural weak points.
What is the TNT equivalent of common military munitions in kilograms?
A standard 155 mm artillery shell contains about 7–11 kg of TNT equivalent. A 500 lb (Mk 82) air-dropped bomb holds roughly 87 kg of TNT equivalent. An RPG-7 warhead is about 1–2 kg TNT equivalent. Anti-tank mines range from 5–10 kg TNT equivalent. These figures represent explosive fill, not total weapon weight.
How many kilograms of TNT equal one stick of dynamite?
A standard stick of commercial dynamite (about 200 g, 20 cm long) has a TNT equivalence of roughly 0.25–0.30 kg, since dynamite is about 1.25–1.5× as powerful as TNT by weight. Eight sticks of dynamite are roughly equivalent to one kilogram of TNT. Modern mining rarely uses traditional dynamite, preferring cheaper ANFO or emulsion explosives.
Megatons of TNT – Frequently Asked Questions
How powerful is one megaton of TNT?
One megaton equals 4.184 × 10¹⁵ joules — the energy of burning about 120 million liters of petrol or the total electricity output of a large power plant running for 50 days. A 1-megaton airburst would flatten reinforced concrete buildings within 2 km, cause third-degree burns at 10 km, and break windows at 40+ km. It is roughly 67 times the Hiroshima bomb.
What was the yield of the Tsar Bomba and why was it so large?
The Soviet AN602 "Tsar Bomba," detonated on 30 October 1961, yielded approximately 50 megatons — the largest human-made explosion in history. It was a three-stage thermonuclear device originally designed for 100 Mt but scaled down by replacing the uranium tamper with lead to reduce fallout. The fireball was 8 km wide, and the mushroom cloud rose 67 km. It was a propaganda weapon with no practical military use.
What are the yields of modern nuclear warheads in megatons?
Modern strategic warheads are smaller than Cold War designs because accuracy improved. The US W88 yields about 0.475 Mt; the W76-1 about 0.1 Mt. Russian RS-28 Sarmat MIRVs carry warheads estimated at 0.5–0.8 Mt each. Military planners found that several smaller warheads (MIRVs) destroy more area than one large one due to the cube-root scaling of blast radius with yield.
How does the megaton scale apply to asteroid impacts?
The Chicxulub impact that ended the dinosaurs released roughly 100 million megatons (10²³ J). The Tunguska event (1908) was 3–15 megatons. NASA's planetary defense threshold is objects capable of 1+ megatons of damage. A 50-meter iron asteroid striking Earth at 20 km/s would release about 10 megatons — enough to obliterate a major city.
Why did nuclear weapon yields decrease after the 1960s despite advancing technology?
Accuracy replaced raw yield. A 0.5 Mt warhead landing within 100 meters of a target destroys it just as effectively as a 10 Mt warhead landing 1 km away. MIRVed missiles carrying 6–10 smaller warheads also cover more total area than one massive bomb. The US retired its last megaton-class warhead (the B83) in 2022, relying entirely on sub-megaton weapons.