Designer
Circle Generator
Minecraft has no curves, so a circle is really a staircase of blocks you have to plan. This generator plots any diameter from 3 to 40 as a block grid — hollow for walls and rings, filled for floors and domes — and counts exactly how many blocks the shape needs before you start hauling materials.
Designer
Circle Generator
Blocks needed28
Widest row5 blocks
Lay the widest row first, then work outwards row by row. Odd diameters give a single centre block, which is what you want for a tower; even diameters centre on a 2×2.