Minecraft Circle Generator

This Minecraft circle generator turns a diameter into a block-by-block pixel circle you can copy straight into a build. Because everything in Minecraft is made of square blocks, a true circle is impossible, so builders use the roundest grid approximation for the size they want, and getting it right by eye is fiddly once a circle grows past a few blocks. You set the diameter, choose whether you want a filled disc or just the outline ring, and the generator draws the pattern row by row using a distance test from the centre of the circle, the same idea behind the pixel circles used in computer graphics. The outline mode is what you want for towers, wells, fountains and round walls, while the filled mode suits solid floors, ceilings and the stacked layers of a dome or sphere. The tool also counts the exact number of blocks in the pattern, so you can gather enough material before you start rather than running short halfway up a tower. Larger diameters look noticeably rounder, and even diameters give a flat edge top and bottom while odd diameters give a single centre block, so try a couple of sizes to see which reads best. Enter a diameter and pick a mode to see your circle instantly.

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One block is shown as a filled square. Outline counts the ring only; filled counts every block inside. Maximum diameter 64.