LD50 of venomous snakes

This list contains comprehensive information about the toxicity of venomous snakes. LD50 is the lethal dose, that kills 50% of the animals in laboratory testing. All LD50-values in this list are from laboratory testing with mice. Snake venom is very specific, you can NOT extrapolated use the LD50 from mice to predict the effect on human beings. The list allows you to find the 10 most venomous snakes of the planet by your own criteria. It is presorted by intravenous LD50, but you can sort it to your own criteria by clicking on any column headline. This list is updated regularly and it's our aim to provide the most comprehensive data collection of this kind in the internet. Even though, you will realize there are a lot of white spots in the table. If you have data, please contact us.

For a detailed explanation of each column headline, click here

No. Scientific Name
Common Name
Toxicity Length Weight Fangs Venom yield
(dry)
LD50 IV 50% kill LD50 SC 50% kill LD50 IP 50% kill LD50 IM 50% kill
1. 1619 Ahaetulla nasuta
Long nosed whip snake
☠☠ 200.0 cm ref 25 mg ref
2. 1646 Boiga irregularis
Brown tree snake
☠☠☠ 310.0 cm ref 1510.0 gr ref 25 mg ref 0.08 mg/kg ref 15,625 🐭 10.33 mg/kg ref 121 🐭
3. 1637 Boiga cyanea
Green Cat Snake
☠☠ 192.0 cm ref 819.7 gr ref 13.16 mg ref
4. 1639 Boiga dendrophila
Mangrove snake
☠☠ 250.0 cm ref 427.6 gr ref 12.5 mg ref 4.85 mg/kg ref 129 🐭 3.3 mg/kg ref 189 🐭
5. 2164 Salvadora grahamiae
Mountain Patchnose Snake
??? 64.8 cm ref 33.1 gr ref 0.6 mg ref
6. 2189 Spalerosophis diadema
Diadem Snake
?☠? 200.0 cm ref 211.2 gr ref 2.75 mg/kg ref
7. 2244 Tantilla nigriceps
Plains Blackhead Snake
?☠? 42.3 cm ref 10.0 gr ref 0.1 mg ref
8. 2296 Toxicodryas blandingii
Blandings Tree Snake
☠☠ 274.0 cm ref 2.9 mg/kg ref
9. 2299 Trimorphodon lambda
Sonoran Lyre Snake
☠☠ 92.1 cm ref 101.4 gr ref 7.7 mg ref
10. 1373 Atractaspis bibronii
Bibron's burrowing asp
☠☠☠ 70.0 cm ref 34.3 gr ref 1.4 mg ref 0.06 mg/kg ref 1,167 🐭
11. 1377 Atractaspis dahomeyensis
Dahomey burrowing asp
☠☠☠ 55.5 cm ref 1 mg ref 2240 mg/kg ref 0 🐭
12. 1379 Atractaspis engaddensis
Palestinian Mole Viper
☠☠☠ 100.0 cm ref 57.5 gr ref 4 mm ref 9.6 mg ref 0.06 mg/kg ref 8,000 🐭
13. 1385 Atractaspis microlepidota
Small scaled burrowing asp
☠☠☠ 110.0 cm ref 93.5 gr ref 10 mg ref 0.06 mg/kg ref 8,333 🐭
14. 1467 Malpolon monspessulanus
Montpellier Snake
☠☠ 200.0 cm ref 1500.0 gr ref 3.80 mm ref 6.5 mg/kg ref
15. 558 Demansia olivacea
Olive whip snake
☠☠☠ 110.0 cm ref 14.2 mg/kg ref
16. 594 Emydocephalus annulatus
Annulated Turtle headed Sea Snake
☠☠ 105.0 cm ref 0.15 mm ref 1.2 mg ref 25 mg/kg ref 2 🐭
17. 611 Hoplocephalus stephensii
Stephen's Banded Snake
☠☠☠ 100.0 cm ref 104.0 gr ref 154 mg ref 1.36 mg/kg ref 5,662 🐭
18. 770 Pseudechis colletti
Collett's black snake
☠☠☠ 240.0 cm ref 226 mg ref 2.38 mg/kg ref 4,748 🐭 1.2 mg/kg ref 9,417 🐭
19. 783 Pseudonaja guttata
Speckled brown snake
☠☠☠ 147.0 cm ref 6 mg ref
20. 509 Aspidelaps lubricus
Cape coral snake
☠☠☠ 80.0 cm ref 13.75 mg ref
21. 510 Aspidelaps scutatus
Shield nose snake
☠☠☠ 75.0 cm ref 75.7 gr ref 0.722 mg/kg ref
22. 592 Elapsoidea sundevallii
Sundevall's African garter snake
☠☠ 140.0 cm ref 0.722 mg/kg ref
23. 880 Homalopsis buccata
Linne's Water Snake
?☠? 137.0 cm ref 347.2 gr ref 14.3 mg/kg ref
24. 858 Myrrophis chinensis
Chinese Mud Snake
☠☠ 72.0 cm ref 230.3 gr ref 2.05 mg/kg ref
25. 856 Subsessor bocourti
Bocourt's Water Snake
☠☠ 123.0 cm ref 2800.0 gr ref 7.3 mg/kg ref
26. 166 Azemiops feae
Fea's viper
☠☠☠ 100.0 cm ref 1.75 mg ref 0.52 mg/kg ref 168 🐭
27. 168 Agkistrodon contortrix
Copperhead
☠☠☠ 134.6 cm ref 217.2 gr ref 7.20 mm ref 75 mg ref 2.711 mg/kg ref 1,383 🐭 0.6 mg/kg ref 6,250 🐭 0.22 mg/kg ref 17,045 🐭 0.024 mg/kg ref 156,250 🐭
28. 172 Atropoides mexicanus
Mexican jumping pit viper
☠☠☠ 90.0 cm ref 5.656 mg/kg ref 1.063 mg/kg ref
29. 173 Atropoides nummifer
Central American jumping pit viper
☠☠☠ 76.2 cm ref 60 mg ref 2.4 mg/kg ref 1,250 🐭
30. 176 Atropoides picadoi
Picado's jumping pit viper
☠☠☠ 120.2 cm ref 70 mg ref 1.419 mg/kg ref 2,467 🐭 0.375 mg/kg ref 9,333 🐭
31. 179 Bothriechis lateralis
Side striped palm viper
☠☠☠ 100.0 cm ref 20 mg ref 5.144 mg/kg ref 194 🐭 0.644 mg/kg ref 1,553 🐭
32. 181 Bothriechis nigroviridis
Black speckled palm pit viper
☠☠☠ 93.7 cm ref 4.438 mg/kg ref 0.875 mg/kg ref
33. 183 Bothriechis schlegelii
Eyelash palm pit viper
☠☠☠ 90.0 cm ref 102.0 gr ref 20 mg ref 1.6 mg/kg ref 625 🐭 0.531 mg/kg ref 1,883 🐭
34. 232 Cerrophidion godmani
Godman's montane pit viper
☠☠☠ 82.0 cm ref 20 mg ref 4.75 mg/kg ref 211 🐭 0.375 mg/kg ref 2,667 🐭
35. 234 Cerrophidion sasai
Costa Rica montane pit viper
☠☠☠ 71.3 cm ref 3.6666 mg/kg ref
36. 256 Crotalus pricei
Western twin spotted rattlesnake
☠☠☠ 66.0 cm ref 62.6 gr ref 8 mg ref 0.95 mg/kg ref 421 🐭 11.39 mg/kg ref 35 🐭
37. 257 Crotalus pusillus
Tancitaran dusky rattlesnake
☠☠☠ 70.0 cm ref 5.35 mg/kg ref 15 mg/kg ref
38. 265 Crotalus tigris
Tiger rattlesnake
☠☠☠ 88.5 cm ref 454.0 gr ref 11 mg ref 0.056 mg/kg ref 9,821 🐭 0.21 mg/kg ref 2,619 🐭 0.05 mg/kg ref 11,000 🐭
39. 278 Gloydius intermedius
Intermediate mamushi
☠☠☠ 80.0 cm ref 0.38 mg/kg ref
40. 274 Gloydius blomhoffii
Mamushi
☠☠☠ 91.0 cm ref 63.7 gr ref 7 mg ref 1.32 mg/kg ref 265 🐭 18.29 mg/kg ref 19 🐭 1.32 mg/kg ref 265 🐭
41. 275 Gloydius brevicaudus
Short tailed mamushi
☠☠☠ 75.0 cm ref 2.044 mg/kg ref 0.875 mg/kg ref
42. 276 Gloydius halys
Siberian pit viper
☠☠☠ 90.0 cm ref 0.304 mg/kg ref 4 mg/kg ref
43. 282 Gloydius shedaoensis
Shedao island pit viper
☠☠☠ 80.0 cm ref 124.0 gr ref 0.813 mg/kg ref
44. 285 Gloydius ussuriensis
Ussuri mamushi
☠☠☠ 70.0 cm ref 1.139 mg/kg ref 0.625 mg/kg ref
45. 305 Porthidium nasutum
Rainforest hog nosed pit viper
☠☠☠ 60.0 cm ref 25 mg ref 4.6 mg/kg ref 272 🐭 0.438 mg/kg ref 2,854 🐭
46. 306 Porthidium ophryomegas
Slender hognosed pit viper
☠☠☠ 80.0 cm ref 20 mg ref 6.813 mg/kg ref 147 🐭 0.719 mg/kg ref 1,391 🐭
47. 311 Protobothrops elegans
Sakishima habu
☠☠☠ 120.0 cm ref 3.8 mg/kg ref
48. 319 Protobothrops tokarensis
Tokara Island Pit Viper
☠☠☠ 150.0 cm ref 7.5 mg/kg ref
49. 328 Sistrurus catenatus
Massassauga
☠☠☠ 100.0 cm ref 45 mg ref 6.8 mg/kg ref 331 🐭
50. 329 Sistrurus miliarius
Pygmy rattlesnake
☠☠☠ 80.0 cm ref 40.6 gr ref 35 mg ref 2.8 mg/kg ref 625 🐭 24.25 mg/kg ref 72 🐭 5 mg/kg ref 350 🐭
51. 367 Trimeresurus stejnegeri
Chinese green tree viper
☠☠☠ 112.0 cm ref 175.5 gr ref 0.8 mg/kg ref
52. 330 Trimeresurus albolabris
White lipped pit viper
☠☠☠ 100.0 cm ref 15 mg ref 0.37 mg/kg ref 2,027 🐭 12.75 mg/kg ref 59 🐭 3.3 mg/kg ref 227 🐭
53. 339 Trimeresurus erythrurus
Red tailed bamboo pit viper
☠☠☠ 140.0 cm ref 2.1 mg/kg ref
54. 344 Trimeresurus gramineus
Bamboo pit viper
☠☠☠ 120.0 cm ref 7 mm ref 1.645 mg/kg ref 4 mg/kg ref
55. 350 Trimeresurus labialis
Nicobar bamboo pit viper
☠☠☠ 44.0 cm ref 1.497 mg/kg ref
56. 352 Trimeresurus macrops
Large eyed pit viper
☠☠☠ 72.0 cm ref 8.75 mg/kg ref
57. 353 Trimeresurus malabaricus
Malabar pit viper
☠☠☠ 105.0 cm ref 18.5 mg/kg ref
58. 359 Trimeresurus popeiorum
Pope's bamboo pit viper
☠☠☠ 97.5 cm ref 7 mm ref 1.45 mg/kg ref
59. 361 Trimeresurus purpureomaculatus
Mangrove pit viper
☠☠☠ 107.0 cm ref 0.5 mg/kg ref
60. 369 Trimeresurus sumatranus
Sumatran pit viper
☠☠☠ 160.0 cm ref 10 mm ref 0.38 mg/kg ref
61. 382 Tropidolaemus wagleri
Wagler's pit viper
☠☠☠ 130.0 cm ref 90 mg ref 0.625 mg/kg ref 7,200 🐭 4.625 mg/kg ref 973 🐭 3.575 mg/kg ref 1,259 🐭
62. 396 Atheris squamigera
African Bush Viper
☠☠☠ 80.0 cm ref 44.5 gr ref 0.611 mg/kg ref
63. 401 Bitis atropos
Cape mountain adder
☠☠☠ 60.0 cm ref 0.111 mg/kg ref
64. 402 Bitis caudalis
Horned puff adder
☠☠☠ 51.5 cm ref 24.1 gr ref 85 mg ref 1.111 mg/kg ref 3,825 🐭 0.18 mg/kg ref 23,611 🐭
65. 403 Bitis cornuta
Western many horned adder
☠☠☠ 60.0 cm ref 32.6 gr ref 0.444 mg/kg ref
66. 408 Bitis parviocula
Ethiopian mountain adder
☠☠☠ 75.2 cm ref 1.56 mg/kg ref
67. 420 Causus rhombeatus
Common Night Adder
☠☠ 100.0 cm ref 300 mg ref 10.278 mg/kg ref 1,459 🐭
68. 422 Cerastes cerastes
Horned viper
☠☠☠ 90.0 cm ref 5 mm ref 0.25 mg/kg ref 0.475 mg/kg ref 0.296 mg/kg ref
69. 423 Cerastes gasperettii
Arabian horned viper
☠☠☠ 85.0 cm ref 0.481 mg/kg ref 0.978 mg/kg ref
70. 424 Cerastes vipera
Sahara sand viper
☠☠☠ 50.0 cm ref 43 mg ref 0.5 mg/kg ref 4,300 🐭 0.25 mg/kg ref 8,600 🐭
71. 438 Echis pyramidum
Egyptian saw scaled viper
☠☠☠ 85.0 cm ref 76.6 gr ref 0.84 mg/kg ref
72. 446 Montivipera bornmuelleri
Lebanon viper
☠☠☠ 75.0 cm ref 193.0 gr ref 0.605 mg/kg ref 6.25 mg/kg ref 1.92 mg/kg ref
73. 448 Montivipera latifii
Latifi's viper
☠☠☠ 78.0 cm ref 104.0 gr ref 0.224 mg/kg ref 4.61 mg/kg ref 2.07 mg/kg ref
74. 449 Montivipera raddei
Armenian mountain viper
☠☠☠ 110.0 cm ref 317.3 gr ref 0.1935 mg/kg ref
75. 451 Montivipera xanthina
Ottoman viper
☠☠☠ 150.0 cm ref 351.3 gr ref 18 mg ref 0.228 mg/kg ref 3,947 🐭
76. 454 Pseudocerastes persicus
Persian horned viper
☠☠☠ 90.0 cm ref 215.3 gr ref 0.604 mg/kg ref
77. 457 Vipera ammodytes
European nose horned viper
☠☠☠ 100.0 cm ref 210.9 gr ref 13 mm ref 0.35 mg/kg ref 2 mg/kg ref 1.4 mg/kg ref
78. 458 Vipera aspis
Aspic viper
☠☠☠ 90.0 cm ref 85.2 gr ref 10 mg ref 0.78 mg/kg ref 641 🐭 1 mg/kg ref 500 🐭
79. 460 Vipera berus
Common European adder
☠☠☠ 90.0 cm ref 4 mm ref 18 mg ref 0.41 mg/kg ref 2,195 🐭 1 mg/kg ref 900 🐭 0.86 mg/kg ref 1,047 🐭
80. 465 Vipera latastei
Lataste's viper
☠☠☠ 75.0 cm ref 87.0 gr ref 26 mg ref 0.755 mg/kg ref 1,722 🐭
81. 466 Vipera lotievi
Caucasian meadow viper
☠☠☠ 62.0 cm ref 0.6075 mg/kg ref
82. 474 Vipera seoanei
Baskian viper
☠☠☠ 75.0 cm ref 90.0 gr ref 0.485 mg/kg ref
83. 476 Vipera ursinii
Ursini's viper
☠☠☠ 80.0 cm ref 65.0 gr ref 4 mg ref
84. 3188 Amphiesma stolatum
Buff Striped Keelback
☠☠ 90.0 cm ref 0.1 mg ref
85. 3225 Natrix tessellata
Dice snake
130.0 cm ref 79.5 gr ref 25 mg/kg ref
86. 3279 Rhabdophis subminiatus
Red necked keelback
☠☠☠ 130.0 cm ref 0.125 mg/kg ref
87. 3281 Rhabdophis tigrinus
Tiger keelback
☠☠☠ 130.0 cm ref 189.3 gr ref 2.30 mm ref 20.5 mg ref 0.265 mg/kg ref 3,868 🐭 9.2 mg/kg ref 111 🐭 7.35 mg/kg ref 139 🐭
88. 3300 Thamnophis elegans
Western Terrestrial Garter Snake
☠☠ 89.5 cm ref 167.9 gr ref 0.46 mg ref 13.85 mg/kg ref 2 🐭
89. 3322 Thamnophis sirtalis
Common Garter Snake
☠☠ 130.0 cm ref 104.2 gr ref 33 mg/kg ref
90. 2650 Diadophis punctatus
Ringneck Snake
☠☠ 75.0 cm ref 19.0 gr ref 2.88 mg ref
91. 2785 Hydrodynastes gigas
False Water Cobra
☠☠ 214.6 cm ref 2709.0 gr ref 15.2 mg ref 2 mg/kg ref 380 🐭
92. 2798 Hypsiglena torquata
Night snake
?☠? 65.0 cm ref 1.05 mg ref
93. 2794 Hypsiglena jani
San Luis Potosi night snake
?☠? 42.8 cm ref 37.1 gr ref 1.05 mg ref 26 mg/kg ref 2 🐭
94. 2817 Leptodeira annulata
Banded Cat eyed Snake
☠☠ 65.4 cm ref 29.9 gr ref 50 mg/kg ref 0.975 mg/kg ref
95. 2933 Philodryas olfersii
Lichtenstein's Green Racer
☠☠☠ 150.0 cm ref 91.5 gr ref 2.79 mg/kg ref

Legend and definitions

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Scientific Name The scientific name is the only way to clearly identify a snake species. Common names can be redundant, but scientific names are unique by definition.
Common name English name of the snake
Class Smiley = harmless, 1 Skull = potentially dangerous, 2 Skulls = dangerous, 3 Skulls = very dangerous, empty space = we don't know, yet
Lenght Maximum length of the snake.
Weight Maximum weight of the snake. For some snakes we have maximum lenght for adults but weight only for hatchlings, don't wonder if length and weight do not fit together. Those are separate values.
Fang Maximum fang length.
Venom The venom yield that can get extracted from a snake, usually by milking it. The milking process can be quite cumbersome, especially with rear fanged species like the Boomslang(Dispholidus typus). This snakes has a low nominal venom yield, but a full bite can be lethal nonetheless. Most of the venom yields in our list are from researches in the 1970s or even earlier. New milking methods would in many cases probably result in much higher venom yields.
LD50 SC (subcutaneous injection) LD50 is the abbreviation for lethal dose 50, sometimes referred as median lethal dose as well. The unit is milligramm per kilo, low LD50 values characterize strong venoms. All LD50 values in this table are from laboratory testing with mice. A dose that kills 50% of the injected mice is the LD50 value. Testing with other animals (e.g. rats, dogs, cats, guinea pigs, frogs, pigeons, monkeys etc) is possible, but less common than testing with mice. That's why they are not included in this list, our LD50s are from murine testing only. The way of injection plays a vital role in envenomination as well. Subcutaneous injection is the injection direcly under the skin. Subcutaneous injection the most common envenomination after a snake bite for humans. That's why we presorted the table by this criteria
LD50 IV (intravenous injection) This is the LD50 for intravenous injection (IV), this happens when the snakebite hits a blood vessel. In most cases - this really depends on the venom type - intravenous injections will show a much stronger effect than subcutaneous injections. Snakebites that directly hit a blood vessel are fortunately relatively rare.
LD50 IP (intraperitoneal injection) This is the LD50 for intraperitoneal injection (IP), this happens when a snake bite its victim into the abdomen.
LD50 IM (intramuscular injection) This is the LD50 for intramuscular injection(IM). Intramuscular injection requires - at least from the perspective of a human bite victim - long venom fangs. That's why this way of envenomination is comparatively rare and less frequently tested.
kills 50% of If you have an LD50 value and a venom yield for a specific snake, you can calculate the number of mice (each at a weight of 20 gr) a snake could theoretically kill with its venom supply. The snake could kill 50% of the displayed number of mice.

Please keep in mind that this table only describes the toxicity of a snake considered they get a full bite with venom injection. IF a snake actually poses a threat to humans is a completely different story and depends on other factors like behaviour and distribution just to name a few. The Inland taipan (Oxyuranus microlepidotus) may be on the top of our list, as it is the snake with the most toxic venom, but it rarely kills people because it lives seclusively in the australian outback. The Saw-scaled viper (Echis carinatus) does not show up in the Top10, but it is considered by many as the most dangerous snake on the planet. It lives close to humans and due to its small size people overlook it easily. And unlike many other snakes, it seldomly gives dry defensive bites. When a Saw-scaled viper bites, and is has a reputation for being aggressive and striking easily, it usually delivers a large quantity of venom. Many people die each year by a bite of this species.