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I'm building a mob farm and I'd Like to know what spot I should be afking at. My mob farm will surround me, so I need to know how far away to place it. Do mobs spawn on the 25th block counting the one I am on, or the 24th counting the one that I'm on.

the block you are on counts as block zero. Start counting from the block next to the one you're standing on.

The game measures distance from your exact position (as a decimal), while natural mob spawning spawns mobs in the middle of a block (x/z + 0.5):

distance = sqrt((px - sx)^2 + (py - sy)^2 + (pz - sz)^2)

Where px, py, pz are the player coordinates and sx, sy, sz are the spawn coordinates, with sx and sz always being the middle of a block (add 0.5 to x and z) and y is generally an integer (unless you are standing on a partial block) and the distance needs to be exactly 24 or greater for a mob to spawn.

Example, a player standing at 0.5, 64, 0.5 will allow mobs to spawn at block (0, 64, 24), effectively (0.5, 64, 24.5):

sqrt((0.5-0.5)^2 + (64 - 64)^2 + (0.5-24.5)^2) = 24

However, you'd need to be standing exactly in the middle so in practice mobs may not spawn until block 25 in two directions (24 in the other two directions); for a spawnable block at (1, 64, 24) you can be anywhere within block (0, 64, 0); of course, the y-coordinate also matters if you aren't at the same level:

sqrt((0.0-0.5)^2 + (64 - 64)^2 + (0.5-24.5)^2) = 24.047
sqrt((0.999-0.5)^2 + (64 - 64)^2 + (0.5-24.5)^2) = 24.005

The same also goes for mobs spawned from mob spawners, except they spawn when a player is within 16 blocks of the exact center of the block (including y, though the difference is very small; sqrt(dx^2 + dz^2) = 15.99 gives a distance of 15.998 when dy is 0.5).

k, thank you.

Quote from TheMasterCaver»

The game measures distance from your exact position (as a decimal), while natural mob spawning spawns mobs in the middle of a block (x/z + 0.5):

Example, a player standing at 0.5, 64, 0.5 will allow mobs to spawn at block (0, 64, 24), effectively (0.5, 64, 24.5):

However, you'd need to be standing exactly in the middle so in practice mobs may not spawn until block 25 in two directions (24 in the other two directions); for a spawnable block at (1, 64, 24) you can be anywhere within block (0, 64, 0); of course, the y-coordinate also matters if you aren't at the same level:

The same also goes for mobs spawned from mob spawners, except they spawn when a player is within 16 blocks of the exact center of the block (including y, though the difference is very small; sqrt(dx^2 + dz^2) = 15.99 gives a distance of 15.998 when dy is 0.5).

Is this how ilmango made his gold farm platform?