Minecraft spiral staircase generator

Diameter, height and steps per turn — the generator lays steps in a spiral around a post, one block per step: a tower, lighthouse or mineshaft staircase. Two blocks: steps and post. In 3D at once, export to .litematic and .schem.

How it works

1. Set the dimensions with the sliders — the shape is recalculated instantly and shown in 3D.
2. Pick a block (some tools take two: main and secondary).
3. Turn on Layers to see the shape slice by slice — handy for building by hand.
4. Download .litematic for Litematica or .schem for WorldEdit.

Examples

• Tower 11×20
• Wide 15×24
• No post

FAQ

How many steps per turn should I pick?

For a diameter of 7–9, 12 steps per turn is enough; wide staircases need 16 or more, otherwise the outer edge of the steps breaks up.

How do I build this without mods?

Open the schematic in the viewer, turn on Layers and place blocks layer by layer on the grid. With Litematica or WorldEdit the schematic is pasted in one go.

Why does the shape look stepped?

Blocks are whole, so every curve turns into steps — the game does the same. An odd size gives a clean centre block, an even size gives two.

Is it free, no sign-up?

Yes. Everything is computed in the browser; the file is built locally and never uploaded.

See also: Helix · Minecraft builder tools