How much weight can a 1x2(or 3) support

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fishyd

Aquarium Advice Freak
Joined
Nov 20, 2013
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354
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Boise, ID
I've been trying to find some info on this for a few days now, and can't find anything. If a 1x2 (or 1x3) were to be used as a support beam, about how much weight could it hold?

I am looking to build a K shaped bookshelf/stand that will be able to hold up to 75lbs on the very top. The top will be holding a 5g tank. The back supports will be 2x4s but looking at 1x2 or 1x3s for the arm/leg.
 
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