Build spheres and domes layer by layer
Choose a dome or a full sphere, set the diameter from 3 to 256 blocks, and follow the plan one layer at a time from the bottom. Each layer is a top-view chart with numbered rows and columns, and every row lists where to skip and where to place blocks. The 3D view shows how far you have come. All plans use full blocks.
Ready-made sphere and dome charts, layer by layer: 11×11 · 15×15 · 21×21 · 31×31 · All sizes
Worked example: a 15 × 11 oval tower and dome
| Layers | Blocks |
|---|---|
| 1 | 36 |
| 2 | 36 |
| 3 | 32 |
| 4 | 32 |
| 5 | 38 |
| 6 | 23 |
| Dome | 197 |
Use hollow walls and shell thickness 1. Build the 8-layer tower first, then place dome layer 1 above tower layer 8 with the same north-west corner. The sections occupy separate layers: 36 × 8 + 197 = 485 blocks over 14 layers, excluding floors, doors and decoration.
Open the 15 × 11 tower planOpen the matching dome plan
Original model illustration; a planning example, not an in-game screenshot.
How do I build a dome in Minecraft, layer by layer?
Start with layer 1, the bottom ring. Row 1 is the north edge of the chart, and every “skip” is counted from the same west edge, so you can count along a straight line of blocks. Mark each row done as you place it. Then move one block up for the next layer and line it up with the faint outline of the layer below. The highlighted row on the chart and the orange layer in the 3D view show where you are.
Checks stay in this browser for each exact shape and size, and the page reopens the last plan you worked on, so you can close it and continue later. To see the checks for another plan, choose its settings again or open its link.
What is the difference between a sphere and a dome?
A sphere is the whole ball, and its height normally equals its diameter. A dome is the top half of a ball, open at the bottom, so it can stand on the ground or on a wall. For an odd diameter, a dome whose height is half the diameter rounded up is exactly the top half of the sphere with that diameter.
Why do some layers look thicker than the shell?
Where the surface is nearly flat, near the top of a dome or the top and bottom of a sphere, neighboring layers differ in width by several blocks. Every block that touches the outside straight up, down or sideways stays in the shell, so these layers become wide rings and the very top becomes a solid cap. That keeps the shell watertight, with no gaps for water or mobs to slip through. Thickness always counts blocks straight in from the outside, never diagonally.
How tall should a dome be?
For a round dome, use half the diameter, rounded up: 11 layers for a dome 21 blocks across. That is what “Make it round” sets, and the height follows the diameter until you change it yourself. A lower height gives a flatter dome, like a shallow roof; a taller one gives a pointed, egg-like shape. With an oval footprint, the round height follows the shorter side.
Can I put a dome on top of a round tower?
Yes. The bottom layer of a dome has exactly the same outer edge as the Circle generator's circle of the same diameter, or its oval of the same width and depth, so it sits flush on a round tower wall. Plan the tower with the Circle generator, then build layer 1 of the dome directly on top of the wall.
Does it work in Bedrock and Java?
Yes. The plan is a building guide for full blocks, which work the same in Minecraft Java and Bedrock Edition, and it needs no mods. The generator runs in your browser and does not connect to your world, so you place every block yourself.
To skip the hand placing, open “More formats” and download a .litematic file for the Litematica mod (Java) or a .mcstructure file for a Bedrock structure block.
How does the generator choose the blocks?
A block belongs to the shape when the center of its cube lies inside the sphere or dome you chose, which is stretched into an oval shape when the height or depth differs from the diameter. A hollow shell keeps the blocks that are within the chosen thickness of the outside, counted through block faces. Solid keeps every block inside.
Does this use the Minecraft trademark?
The word describes the game the blueprint is for. Sealmount is an independent fan-made tool, not an official Minecraft service. It is not approved by or associated with Mojang or Microsoft.
