Most venomous snakes

But, to your point — by potential, yes. However, Belchers' only bite a fraction of the time and rarely envenomate. And not all Belcher's carry venom. It's only around 1/2 or 1/4. So while a drop of their venom has the capacity to kill 10x more than a cobra's, they're just much less dangerous.

A good way to score snakes is based not just on venom potency, but how likely you are to encounter them, how aggressive they are, how consistently they deliver venom, and how much they deliver.

This site gives a good score-card:

http://www.reptilegardens.com/animals/snakes/worlds-deadliest

Taipans in general score high, but Papuan & Coastal taipans are worse than inlands. Based on everything I've read, though, I think pound-for-pound the Eastern Brown Snake is the worst. Extremely lethal venom, common to populated areas, meaner & more aggressive than most other snakes. Mambas & Cobras are nearly as bad. Hence, their reputations.