as a rough guide if its a well supported "L" bracket with a normal load
with the long section secured to the wall then the total shelve depth will similar in depth to the long arm and maybe a wee bit more so the bracket arm is about 75% the depth
but as said wall construction 'load 'bracket type and spacing along with shelve material and thickness affect the answer
The shelves will be in the kitchen and will hold general stuff, like spice jars, sundry packets e.g. of rice and the like - nothing individually heavy.
The wall is an external wall made of brick.
The shelves are some 300mm deep.
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