Typically anything above 20 is rated as 20+ but if you’re ordering and the retailer states the weight per leg, this gives you an idea of what you will be receiving. I know, it is a bit confusing since the sizing is per 10lbs instead of 1lb. Just remember, the smaller the number the bigger the crab leg size will be!  The smaller sizes are 12/14 or smaller; this means that there are 12 to 14 legs per 10 lbs, not counting the claws.  The largest King Crab Legs are 4/6 size which means 4 to 6 per 10 lbs.
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King Crab Legs
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King Crab Leg sizes are determined by the number of legs per 10 lbs, not counting claws although claws are usually packaged in with them. Some claws are smaller than others for the same size because there is one killer claw, and one feeder claw on each crab.  Here’s a handy little conversion scale taking the per-leg weight and giving you the size grade since many retailers tell you only the per-leg weight in order to fool you into thinking it is big! Moral of the story is always ask if you don’t know and find an honest merchant.
King Crab
1/4lb leg = 40 1/3lb leg = 30 1/2 lb leg = 20 2/3 lb leg = 15 1lb leg = 10 1.5 lb leg = 4 2lb leg = 5 2.5lb leg = 4 3lb leg = 3 For more details, please visit: www.kingcrablegs.org
How to sizes?