Free build planning tools · runs in your browser

Plan voxel builds before you place the first block.

Generate circles, spheres, ovals and cylinders, calculate portal coordinates, and convert block counts into stacks. Fast, visual, mobile-friendly, and no sign-up.

Open circle generator Browse all tools

Build tools

Each tool solves one concrete building problem and works fully client-side.

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Minecraft Circle Generator

Hollow or filled circles with block count, row-by-row guide, progress tracking and PNG export.

Sphere Generator

Step through a sphere one horizontal layer at a time and see total block requirements.

Open layers →⬭

Oval Generator

Choose independent width and height for stadiums, arches, plazas and custom footprints.

Generate oval →▣

Cylinder Generator

Plan tower footprints and calculate the total blocks for any cylinder height.

Plan tower →⇄

Nether Portal Calculator

Convert X/Z coordinates between the Overworld and Nether using the 8:1 horizontal scale.

Convert coordinates →▦

Block & Stack Calculator

Turn block totals into stacks, remainders, shulker boxes and double chests.

Count materials →

Designed for actual building, not just screenshots

Build modeCircle rows can be checked off as you build, with progress stored only on your device.

Exact material countsSee total blocks and stack counts before gathering resources.

No server requiredCalculations run locally in your browser, so tools stay quick and private.

Why use a block-shape generator?

Large circles and spheres are easy to distort when built by eye. A grid turns a mathematical shape into discrete rows you can copy directly into a block world. Start with the diameter or dimensions you want, then follow the generated pattern row by row.

For practical instructions, see the circle building guide and sphere layer guide.