Fishing Hooks Sizes

Essentially, fishing hook sizes start in the middle and work their way out. On the left, you have sizes. On the right, you have “aughts.”

The smallest hooks out there begin at around a size 30. The second-smallest is size 29, then 28, 27, and so on, running “up” to size 1. After size 1, it switches to size 1/0 (pronounced “one aught”) then 2/0, 3/0, all the way to 27/0, which we assume people use to catch literal sea monsters.

It’s worth mentioning that there’s no standardized “actual size.” A 1/0 jig hook won’t be the same size as a 1/0 circle hook. More importantly, it varies a lot by brand. A 1/0 jig hook made by Eagle Claw will probably be bigger than the same hook made by Gamakatsu, but smaller than one made by Mustad. And size is only one of the measurements involved.