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TNT equivalent

Class of units of measurement for explosive energy

Class of units of measurement for explosive energy

FieldValue
nameTNT equivalent
imageAtomic blast Nevada Yucca 1951.jpg
captionThe explosion from a 14-kiloton nuclear test at the Nevada Test Site, in 1951
standardNon-standard
quantityEnergy
symbolt
symbol2ton of TNT
units1SI base units
inunits1≈
units2CGS
inunits2
units3US customary

TNT equivalent is a convention for expressing energy, typically used to describe the energy released in an explosion. A ton of TNT equivalent is a unit of energy defined by convention to be (). It is the approximate energy released in the detonation of a metric ton (megagram) of trinitrotoluene (TNT). In other words, for each gram of TNT exploded, (or 4184 joules) of energy are released. This convention intends to compare the destructiveness of an event with that of conventional explosive materials, of which TNT is a typical example, although other conventional explosives such as dynamite contain more energy. A related concept is the physical quantity TNT-equivalent mass (or mass of TNT equivalent), expressed in the ordinary units of mass and its multiples: kilogram (kg), megagram (Mg) or tonne (t), etc.

Kiloton and megaton

The "kiloton (of TNT equivalent)" is a unit of energy equal to 4.184 terajoules (). A kiloton of TNT can be visualized as a cube of TNT 8.46 m on a side.

The "megaton (of TNT equivalent)" is a unit of energy equal to 4.184 petajoules ().

The kiloton and megaton of TNT equivalent have traditionally been used to describe the energy output, and hence the destructive power, of a nuclear weapon. The TNT equivalent appears in various nuclear weapon control treaties, and has been used to characterize the energy released in asteroid impacts.

Historical derivation of the value

Alternative values for TNT equivalency can be calculated according to which property is being compared and when in the two detonation processes the values are measured.

Where for example the comparison is by energy yield, an explosive's energy is normally expressed for chemical purposes as the thermodynamic work produced by its detonation. For TNT this has been accurately measured as 4,686 J/g from a large sample of air blast experiments, and theoretically calculated to be 4,853 J/g.

However, even on this basis, comparing the actual energy yields of a large nuclear device and an explosion of TNT can be slightly inaccurate. Small TNT explosions, especially in the open, do not tend to burn the carbon-particle and hydrocarbon products of the explosion. Gas-expansion and pressure-change effects tend to "freeze" the burn rapidly. A large, open explosion of TNT may maintain fireball temperatures high enough that some of those products do burn up with atmospheric oxygen. name="Needham" | archive-date = December 26, 2018 | url-status = live | access-date = January 25, 2019

Such differences can be substantial. For safety purposes, a range as wide as has been stated for a gram of TNT upon explosion. Thus one can state that a nuclear bomb has a yield of 15 kt (), but the explosion of an actual pile of TNT may yield (for example) due to additional carbon/hydrocarbon oxidation not present with small open-air charges.

These complications have been sidestepped by convention. The energy released by one gram of TNT was arbitrarily defined as a matter of convention to be 4,184 J, which is exactly one kilocalorie.

Grams TNTSymbolTons TNTSymbolEnergyCorresponding mass loss
milligram of TNTmgnanoton of TNTnt4.184 J46.55 fg
gram of TNTgmicroton of TNTμt4.184 kJ46.55 pg
kilogram of TNTkgmilliton of TNTmt4.184 MJ46.55 ng
megagram of TNTMgton of TNTt4.184 GJ46.55 μg
gigagram of TNTGgkiloton of TNTkt4.184 TJ46.55 mg
teragram of TNTTgmegaton of TNTMt4.184 PJ46.55 g
petagram of TNTPggigaton of TNTGt4.184 EJ;46.55 kg

Conversion to other units

1 ton of TNT equivalent is approximately:

  • calories
  • joules
  • British thermal units
  • foot-pounds
  • kilowatt-hours
  • electronvolts
  • kilograms mass equivalent

Examples

EnergyDescriptionMegatons of TNTWatt-hours [Wh]
1.162 Wh≈ 1 food kilocalorie (kilocalorie, kcal), which is the approximate amount of energy needed to raise the temperature of one kilogram of water by one degree Celsius at a pressure of one atmosphere.
1.162 kWhUnder controlled conditions one kilogram of TNT can destroy (or even obliterate) a small vehicle.
5.6 kWhThe energy to burn 1 kilogram of wood.
11.62 kWhThe approximate radiant heat energy released during 3-phase, 600 V, 100 kA arcing fault in a 20 x compartment within a 1-second period.
13.94 kWhAmount of TNT used (12 kg) in Coptic church explosion in Cairo, Egypt on December 11, 2016 that left 29 dead and 47 injured
2.90 MWhThe television show MythBusters used 2.5 tons of ANFO to make "homemade" diamonds. (Episode 116.)
–280–2,800 kWhThe energy output released by an average lightning discharge.
1.16–51.14 MWhConventional bombs yield from less than one ton to FOAB's 44 tons. The yield of a Tomahawk cruise missile is equivalent to 500 kg of TNT.
581 MWhA real 0.454 ktonTNT charge at Operation Sailor Hat. If the charge were a full sphere, it would be 1 ktonTNT. [[File:Sailor Hat Shot.jpgthumbupright454 tons of [[trinitrotolueneTNT]] (17 by) awaiting [[detonation]] at [[Operation Sailor Hat]].]]
2.088 GWhEstimated yield of the Beirut explosion of 2,750 tons of ammonium nitrate that killed initially 137 at and near a Lebanese port at 6 p.m. local time Tuesday August 4, 2020. An independent study by experts from the Blast and Impact Research Group at the University of Sheffield predicts the best estimate of the yield of Beirut explosion to be 0.5 kilotons of TNT and the reasonable bound estimate as 1.12 kilotons of TNT.
1.16–2.32 GWhEstimated yield of the Oppau explosion that killed more than 500 at a German fertilizer factory in 1921.
2.67 GWhAmount of solar energy falling on 1 acre of land in a year is 2650 MWh (an average over the Earth's surface).
3.4 GWhThe Halifax Explosion in 1917 was the accidental detonation of 200 tons of TNT and 2,300 tons of Picric acid
3.6 GWhThe Operation Big Bang on April 18, 1947, blasted the bunkers on Heligoland. It accumulated 6700 metric tons of surplus World War II ammunition placed in various locations around the island and set off. The energy released was , or about 3.2 kilotons of TNT equivalent.
9.3 GWhMinor Scale, a 1985 United States conventional explosion, using 4,744 tons of ANFO explosive to provide a scaled equivalent airblast of an eight kiloton (33.44 TJ) nuclear device, is believed to be the largest planned detonation of conventional explosives in history.
17.4–23.2 GWhThe Little Boy atomic bomb dropped on Hiroshima on August 6, 1945, exploded with an energy of about 15 ktonTNT killing between 90,000 and 166,000 people, and the Fat Man atomic bomb dropped on Nagasaki on August 9, 1945, exploded with an energy of about 20 ktonTNT killing over 60,000. The modern nuclear weapons in the United States arsenal range in yield from 0.3 ktonTNT to 1.2 MtonTNT equivalent, for the B83 strategic bomb.
280 GWhThe typical energy yield of severe thunderstorms.
–20 MWh – 700 GWhThe estimated kinetic energy of tornados.
11.16 TWhThe energy contained in one megaton of TNT (4.2 PJ) is enough to power the average American household for 103,000 years. The 30 MtonTNT estimated upper limit blast power of the Tunguska event could power the same average home for more than 3,100,000 years. The energy of that blast could power the entire United States for 3.27 days.
8.610 TWhThe energy output that would be released by a typical tropical cyclone in one minute, primarily from water condensation. Winds constitute 0.25% of that energy.
1618.6 TWhThe approximate radiated surface energy released in a magnitude 8 earthquake.
21.525 TWhThe complete conversion of 1 kg of matter into pure energy would yield the theoretical maximum (E = mc2) of 89.8 petajoules, which is equivalent to 21.5 megatons of TNT. No such method of total conversion as combining 500 grams of matter with 500 grams of antimatter has yet been achieved. In the event of proton–antiproton annihilation, approximately 50% of the released energy will escape in the form of neutrinos, which are almost undetectable. Electron–positron annihilation events emit their energy entirely as gamma rays.
2428 TWhApproximate total yield of the 1980 eruption of Mount St. Helens.
26.330.6 TWhEnergy released by the 2004 Indian Ocean earthquake.[[File:2004 Indonesia Tsunami Complete.gifthumbAn animation of the 2004 Indian Ocean tsunami]]
53 TWhThe energy released in the 2011 Tōhoku earthquake and tsunami was over 200,000 times the surface energy and was calculated by the USGS at joules, slightly less than the 2004 Indian Ocean quake. It was estimated at a moment magnitude of 9.0–9.1.[[File:2011 Tōhoku earthquake and tsunami damage Matsushima, Miyagi.JPGthumbThe damage caused by the 2011 Tōhoku tsunami]]
50–5658 TWhThe Soviet Union developed a prototype thermonuclear device, nicknamed the Tsar Bomba, which was tested at 50–56 MtonTNT, but had a maximum theoretical design yield of 100 MtonTNT. The effective destructive potential of such a weapon varies greatly, depending on such conditions as the altitude at which it is detonated, the characteristics of the target, the terrain, and the physical landscape upon which it is detonated.
6170.9 TWhThe energy released by the 2022 Hunga Tonga–Hunga Haʻapai volcanic eruption, in the southern Pacific Ocean, is estimated to have been equivalent to 61 Megatons of TNT.
8497.04 TWhThe solar irradiance on Earth every second.
200230 TWhThe total energy released by the 1883 eruption of Krakatoa in the Dutch East Indies (present-day Indonesia).
540630 TWhThe total energy produced worldwide by all nuclear testing and combat usage combined, from the 1940s to the present, is about 540 megatons.
1,4601.69 PWhThe total global nuclear arsenal is about 15,000 nuclear warheads with a destructive capacity of around 1460 megatons or 1.46 gigatons (1,460 million tons) of TNT. This is the equivalent of joules of energy
2,6803 PWhThe energy yield of the 1960 Valdivia earthquake, was estimated at a moment magnitude of 9.4–9.6. This is the most powerful earthquake recorded in history.[[File:Valdivia after earthquake, 1960.jpgthumbThe aftermath of the 1960 Valdivia earthquake.]]
2,8703.34 PWhThe energy released by a hurricane per day during condensation.
33,00038.53 PWhThe total energy released by the 1815 eruption of Mount Tambora in the island of Sumbawa in Indonesia. Yielded the equivalent of 2.2 million Little Boys (the first atomic bomb to drop on Japan) or one-quarter of the entire world's annual energy consumption. This eruption was 4-10 times more destructive than the 1883 Krakatoa eruption.
240,000280 PWhThe approximate total yield of the super-eruption of the La Garita Caldera is 10,000 times more powerful than the 1980 Mount St. Helens eruption. It was the second most energetic event to have occurred on Earth since the Cretaceous–Paleogene extinction event 66 million years ago.[[File:WheelerGACO.jpgthumbA photo of the La Garita Caldera]]
301,000350 PWhThe total solar irradiance energy received by Earth in the upper atmosphere per hour.
875,0001.02 EWhApproximate yield of the last eruption of the Yellowstone supervolcano.[[File:Yellowstone Caldera.svgthumbImage of the Yellowstone supervolcano.]]
4.2 EWhThe solar irradiance of the Sun every 12 hours.
7 EWhThe estimated energy at impact when the largest fragment of Comet Shoemaker–Levy 9 struck Jupiter is equivalent to 6 million megatons (6 trillion tons) of TNT.[[File:Comet Shoemaker-Levy 9 Impact Site on Jupiter.jpgthumbThe impact site of the Comet Shoemaker-Levy 9]]
116 EWhEstimates in 2010 show that the kinetic energy of the Chicxulub impact event yielded 72 teratons of TNT equivalent (1 teraton of TNT equals 106 megatons of TNT) which caused the K-Pg extinction event, wiping out 75% of all species on Earth. This is far more destructive than any natural disaster recorded in history. Such an event would have caused global volcanism, earthquakes, megatsunamis, and global climate change. [[File:Chicxulub-animation.gifthumbThe animation of the Chicxulub impact.]]
28 ZWhThe impact energy of Archean asteroids.
106 ZWhThe total energy output of the Sun per second.
280 ZWhThe kinetic energy of the Caloris Planitia impactor.[[File:The Mighty Caloris (PIA19213) cropped.pngthumbThe photo of the Caloris Planitia on Mercury. Taken by the [[MESSENGER]] orbiter.]]
RWhThe explosive energy of a quantity of TNT of the mass of Earth.
RWhTotal solar output in all directions per day.
WhThe explosive energy of a quantity of TNT of the mass of the Sun.
WhA type Ia supernova explosion gives off 1– joules of energy, which is about 2.4–4.8 hundred billion yottatons (24–48 octillion (2.4–) megatons) of TNT, equivalent to the explosive force of a quantity of TNT over a trillion (1012) times the mass of the planet Earth. This is the astrophysical standard candle used to determine galactic distances.
WhThe largest type of supernova observed, gamma-ray bursts (GRBs) release more than 1046 joules of energy.
WhA merger of two black holes, resulting in the first observation of gravitational waves, released joules
WhEstimated mass-energy of the observable universe.

Relative effectiveness factor ==

The relative effectiveness factor (RE factor) relates an explosive's demolition power to that of TNT, in units of the TNT equivalent/kg (TNTe/kg). The RE factor is the relative mass of TNT to which an explosive is equivalent; the greater the RE, the more powerful the explosive.

This enables engineers to determine the proper masses of different explosives when applying blasting formulas developed specifically for TNT. For example, if a timber-cutting formula calls for a charge of 1 kg of TNT, then based on octanitrocubane's RE factor of 2.38, it would take only 1.0/2.38 (or 0.42) kg of it to do the same job. Using PETN, engineers would need 1.0/1.66 (or 0.60) kg to obtain the same effects as 1 kg of TNT. With ANFO or ammonium nitrate, they would require 1.0/0.74 (or 1.35) kg or 1.0/0.32 (or 3.125) kg, respectively.

Calculating a single RE factor for an explosive is, however, impossible. It depends on the specific case or use. Given a pair of explosives where one can produce double the shockwave output (this depends on the distance of measuring instruments), the difference in direct metal cutting ability may be quadruple for one type of metal and septuple for another type of metal. The relative differences between two explosives with shaped charges will be even greater. The table below should be taken as an example and not as a precise source of data.

Explosive, gradeDensity
(g/ml)Detonation
vel. (m/s)Relative
effectiveness
Ammonium nitrate (AN + 2O)0.882,700volume = 14issue = 11pages = 2671–2678last1 = Törökfirst1 = Zoltánlast2 = Ozunufirst2 = Alexandrutitle = Hazardous properties of ammonium nitrate and modeling of explosions using TNT equivalency.journal = Environmental Engineering & Management Journaldate = 2015doi = 10.30638/eemj.2015.284bibcode = 2015EEMJ...14.2671Tdoi-access = free}}
Mercury(II) fulminate4.424,2500.51
Black powder (75% KNO3 + 19% C + 6% S, ancient low explosive)1.654000.55
Hexamine dinitrate (HDN)1.305,0700.60
Dinitrobenzene (DNB)1.506,0250.60
HMTD (hexamine peroxide)0.884,5200.74
ANFO (94% AN + 6% fuel oil)0.924,2000.74
Urea nitrate1.674,7000.77
TATP (acetone peroxide)1.185,3000.80
Tovex Extra (AN water gel) commercial product1.335,6900.80
Hydromite 600 (AN water emulsion) commercial product1.245,5500.80
ANNMAL (66% AN + 25% NM + 5% Al + 3% C + 1% TETA)1.165,3600.87
Amatol (50% TNT + 50% AN)1.506,2900.91
Nitroguanidine1.766,750
Trinitrotoluene (TNT)1.606,9001.00
Hexanitrostilbene (HNS)1.707,0801.05
Nitrourea1.456,8601.05
Tritonal (80% TNT + 20% aluminium)1.706,6501.05
Nickel hydrazine nitrate (NHN)1.707,0001.05
Amatol (80% TNT + 20% AN)1.556,5701.10
Nitrocellulose (13.5% N, NC; AKA guncotton)1.406,4001.10
Nitromethane (NM)1.136,3601.10
PBXW-126 (22% NTO, 20% RDX, 20% AP, 26% Al, 12% PU's system)1.806,4501.10
Diethylene glycol dinitrate (DEGDN)1.386,6101.17
PBXIH-135 EB (42% HMX, 33% Al, 25% PCP-TMETN's system)1.817,0601.17
PBXN-109 (64% RDX, 20% Al, 16% HTPB's system)1.687,4501.17
Triaminotrinitrobenzene (TATB)1.807,5501.17
Picric acid (TNP)1.717,3501.17
Trinitrobenzene (TNB)1.607,3001.20
Tetrytol (70% tetryl + 30% TNT)1.607,3701.20
Dynamite, Nobel's (75% NG + 23% diatomite)1.487,2001.25
Tetryl1.717,7701.25
Torpex (aka HBX, 41% RDX + 40% TNT + 18% Al + 1% wax)1.807,4401.30
Composition B (63% RDX + 36% TNT + 1% wax)1.727,8401.33
Composition C-3 (78% RDX)1.607,6301.33
Composition C-4 (91% RDX)1.598,0401.34
Pentolite (56% PETN + 44% TNT)1.667,5201.33
Semtex 1A (76% PETN + 6% RDX)1.557,6701.35
Hexal (76% RDX + 20% Al + 4% wax)1.797,6401.35
RISAL P (50% IPN + 28% RDX + 15% Al + 4% Mg + 1% Zr + 2% NC)1.395,9801.40
Hydrazine nitrate1.598,5001.42
Mixture: 24% nitrobenzene + 76% TNM1.488,0601.50
Mixture: 30% nitrobenzene + 70% nitrogen tetroxide1.398,2901.50
Nitroglycerin (NG)1.597,7001.54
Methyl nitrate (MN)1.217,9001.54
Octol (80% HMX + 19% TNT + 1% DNT)1.838,6901.54
Nitrotriazolone (NTO)1.878,1201.60
DADNE (1,1-diamino-2,2-dinitroethene, FOX-7)1.778,3301.60
Gelignite (92% NG + 7% nitrocellulose)1.607,9701.60
Plastics Gel (in toothpaste tube: 45% PETN + 45% NG + 5% DEGDN + 4% NC)1.517,9401.60
Composition A-5 (98% RDX + 2% stearic acid)1.658,4701.60
Erythritol tetranitrate (ETN)1.728,2061.60
Hexogen (RDX)1.788,6001.60
PBXW-11 (96% HMX, 1% HyTemp, 3% DOA)1.818,7201.60
Penthrite (PETN)1.778,4001.66
Ethylene glycol dinitrate (EGDN)1.498,3001.66
MEDINA (Methylene dinitroamine)1.658,7001.70
Trinitroazetidine (TNAZ)1.869,5971.70
Octogen (HMX grade B)1.959,1001.70
Hexanitrobenzene (HNB)1.979,3401.80
Hexanitrohexaazaisowurtzitane (HNIW; AKA CL-20)1.979,5001.90
AFX-757 (25% RDX, 30% ammonium perchlorate, 33% aluminium)1.846,0801.90
DDF (4,4'-Dinitro-3,3'-diazenofuroxan)1.9810,0001.95
Heptanitrocubane (HNC)1.929,200N/A
Octanitrocubane (ONC)1.9510,6002.38
Octaazacubane (OAC)2.6915,000

Nuclear examples

WeaponTotal yield
(kilotons of TNT)Mass
(kg)Relative
effectiveness
GBU-57 bomb (Massive Ordnance Penetrator, MOP)0.003513,6000.26
Grand Slam (Earthquake bomb, M110)0.00659,9000.66
Bomb used in Oklahoma City (ANFO based on racing fuel)0.00182,3000.78
BLU-82 (Daisy Cutter)0.00756,8001.10
MOAB (non-nuclear bomb, GBU-43)0.0119,8001.13
FOAB (advanced thermobaric bomb, ATBIP)0.0447,1006.20
W54, Mk-54 (Davy Crockett)0.022231,000
Little Boy (dropped on Hiroshima) A-bomb154,4004,000
Fat Man (dropped on Nagasaki) A-bomb204,6004,500
W54, B54 (SADM)1.02343,500
Classic (one-stage) fission A-bomb2242050,000
Hypothetical suitcase nuke2.53180,000
Typical (two-stage) nuclear bomb500–1000650–1,120900,000
W88 modern thermonuclear warhead (MIRV)4703551,300,000
Tsar nuclear bomb (three-stage)50,000–56,00026,5002,100,000
B53 nuclear bomb (two-stage)9,0004,0502,200,000
Operation Dominic Housatonic (two-stage)9,9603,2393,042,400
W56 thermonuclear warhead1,200272–3084,960,000
B41 nuclear bomb (three-stage)25,0004,8505,100,000

Footnotes

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