Minecraft Circle Generator

How the block pattern is calculated

A Minecraft circle is a rasterized approximation, not a mathematically smooth curve. The generator tests the center of each block against the ellipse equation x²/a² + y²/b² ≤ 1, where a is half the selected width and b is half the selected height. Equal dimensions produce a circle. Different dimensions produce an ellipse.

Filled mode keeps every qualifying block. Hollow mode repeatedly removes interior blocks whose four direct neighbours are also inside the shape. An outline thickness of one keeps the outer boundary; larger values retain additional layers toward the center. If the requested outline reaches the middle, the result simply becomes solid. The same plan works in Java Edition and Bedrock Edition because it describes block positions rather than game commands or version-specific mechanics.

Worked 21 × 21 example

Select Circle, enter 21 blocks, and choose Hollow. The blueprint spans 21 blocks on both axes and marks only the outside ring. Start with the top and bottom rows, mirror each row across the center, and then repeat the same pattern on the other side. For a solid plaza or floor, switch to Filled and use the updated material count.

Placement tips and limits

• Choose the center deliberately. Odd dimensions have a single central row and column. Even dimensions are centered between two rows and columns.
• Build in mirrored sections. Place one quarter first, then mirror it. This makes skipped or extra blocks easier to spot.
• Count the blueprint, not a smooth circumference formula. 2πr estimates a continuous curve; the displayed block count measures the actual rasterized cells.
• Expect visible steps. Small circles look more angular because fewer blocks are available to describe the curve. Increasing the diameter gives the outline more gradual transitions.
• Treat the SVG as a plan. It is a two-dimensional layer, so cylinders repeat the hollow ring vertically and domes or spheres require different-sized layers.