Minecraft Sphere Generator

Build it as a stack of circles. Start with the bottom layer, then add one circle per layer, getting wider up to the middle and narrower again towards the top. The layer table above gives the width of each circle and layer view shows exactly which blocks to place.

It depends on the diameter and whether it is hollow. With this generator an 18-block hollow sphere uses 792 blocks and the same sphere filled uses 3,112. The total updates as you change the size.

Odd diameters have one centre block, which makes it easier to line up doors, beacons or a central pillar. Even diameters have a 2 × 2 centre and suit builds that are themselves an even number of blocks wide.

Choose Dome in the shape list. It builds the upper half of a sphere, and the curve setting makes it flatter or taller, which is useful for roofs, observatories and greenhouses.

This tool goes up to 64 blocks across. A 64-block sphere is already taller than most builds need; the Overworld is 384 blocks tall in total.

The 3D preview, layer view, table and layer guide work for any edition. The .mcfunction export uses Java commands, so on Bedrock build from the layer guide.