Minecraft Dome Generator
Set the base width and the height of your dome and get a layer plan: a numbered grid for each layer, the blocks per layer and the total, for a solid or hollow dome. The dome sits flat on its base layer, and a 3D preview lets you check the curve.
How to build a dome in Minecraft
- 1
Enter the base and height
Type the base width in blocks and the height in layers. For a half sphere, the height is half the base, rounded up for odd bases.
- 2
Solid or hollow
A hollow dome is a one-block shell that you can stand under. Solid is for terrain, hills and statues.
- 3
Go up the layers
Layer 1 is the base ring and each layer above is smaller. The grid shows the ring and its row counts for each one.
- 4
Place and check
Build ring by ring, and compare with the 3D preview. For odd sizes you can copy a WorldEdit command and trim the lower half.
Minecraft dome block counts
Half-sphere domes (height is half the base, rounded up) for common base widths, worked out by the same code as the tool.
| 9 wide, 5 high | Solid 229 blocks, hollow 105. |
|---|---|
| 11 wide, 6 high | Solid 418 blocks, hollow 153. |
| 15 wide, 8 high | Solid 984 blocks, hollow 285. |
| 21 wide, 11 high | Solid 2,647 blocks, hollow 569. |
| 31 wide, 16 high | Solid 8,132 blocks, hollow 1,233. |
| 41 wide, 21 high | Solid 18,725 blocks, hollow 2,177. |
What the dome calculator works out
A dome is the top half of a sphere that rests on a flat base. In blocks, it is a stack of circles that get smaller towards the top. You give the base width and the height, and the tool works out which blocks belong to each layer, how many there are, and the total for the whole dome. It keeps the middle layer of the sphere as the base for odd heights, so the dome stands on its widest ring and the walls start out vertical.
The height does not have to equal half the base. A taller height gives a pointed, egg-shaped dome and a shorter one gives a flat, bowl-like roof. The tool takes any height you choose. If the base is oval, turn off the round base option and enter a width and a depth separately.
Solid, hollow and what to put on top
Hollow domes are the usual choice for roofs, observatories, greenhouses and arenas, because you can walk inside. The shell is one block thick, so it is quick to build. Add a second shell one block inside for a thick wall, or use glass for the top and stone for the lower rings. The base ring is also the floor plan, so you can build the circle first and the dome on top.
A solid dome is a hill, a mound, a bunker roof or a buried vault. The block count is much larger, and the table shows how fast it grows. Work out your materials before you start, and build from the bottom up so you can see each ring. The layer slider and the counts help you stop at any height.
Building the dome step by step
Mark the centre and lay the base ring from the first grid. Next, build the second layer on top of it, set back as the grid shows, and continue upward. At each layer, check the width of the longest row against the grid. A pillar at the centre is a useful guide: its top is where the dome closes.
For a very large dome, the WorldEdit //hsphere or //sphere command makes a full sphere, and you then remove the lower half. The tool writes the command for odd sizes and adds a note on how to cut the lower half. The grid is the reference for every size, including even ones. Once the shell is up, fill the floor, add a door in the base ring and light the inside, because a large hollow dome is dark enough for mobs to spawn.
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