My hooks have all been mixed together and I was wondering if there is any to tell what's a 1/0,2/0,3/0,5/0 ect..

There's no industry standard, just organize them from biggest to smallest.

 I wish the hook makers would stamp them with size numbers.

 

  What I do is label a plano box or flambeau box with stickers and write 1/0, 2/0, 3/0, 4/0, 5/0, etc...   I also keep one hook in their original pack in my big tackle box I don't carry around.  That way when my hooks get mixed up I can get the original pack and compare all the mixed up with the original ones in the pack and see what size the hooks are.  

Well.. Just use the hook size for the plastic bait in question.. It doesn't need to be be a exact sizing so to speak, mustad & owner, eagle claw & others have sizing charts online if that helps.

I'm sure Gammy does too..

Just organize them into to groups biggest to smallest, if they are all the same brand then you should be able to tell what */0 they are.

I have a Jann's Netcraft hook sizing chart that is pretty accurate.  Comes in handy when replacing trebles.

I just look at them and if it is the size that fits then I use that one. I don't even know what size hooks I use on stuff. I just know how big it is.

My main terminal tackle boxes are labeled. Though when I fill up a smaller box for fishing I just grab what fits the bait.