Minecraft Dome Generator
Enter the base diameter to get every layer of a dome, its block count, its height and the stacks to gather, with an optional straight wall underneath.
1 — bottom2 — top
The plan above is the last valid one, dimmed. Fix the input to update it.
- Total blocks
- blocks
- Dome blocks
- blocks
- Wall blocks
- blocks
- Total height
- layers
- Stacks to gather
- stacks
- Full stacks of 64
- stacks
- Left over
- blocks
Block count per layer
- Layer counts appear here once the plan is drawn.
Row readout
What counts as the dome
A dome here is the upper half of the sphere defined on the sphere generator page, for a sphere of the same diameter. Layer 1 is the base layer and the layers above it get smaller. The dome is open underneath: hollow is worked out against the full sphere, so the base layer is a complete ring rather than a closed floor.
For an odd diameter the widest layer, through the middle of the sphere, is included as the base layer. For an even diameter the middle of the sphere falls between two layers, so the dome starts at the layer just above it. The dome height is the base diameter divided by two, rounded up.
Example: diameter 4, solid, has layers of 12 and 4 blocks, so 16 in total and 2 layers high. Diameter 3, solid, has layers of 9 and 5 blocks, 14 in total.
Adding a wall
Wall height adds that many layers under the dome, each an exact copy of the base layer, so the wall continues the base ring straight down. Wall blocks are the wall height times the base layer count. With diameter 4 solid and a wall of 3, the wall adds 36 blocks, the total is 52 and the height is 5.
Sizing a dome roof
To roof an existing round room, match the dome’s base diameter to the outer diameter of the wall. If you laid the wall out with the circle generator, use the same diameter and style here, and the base layer will line up with the top ring of the wall. For a tall round wall of your own, the round tower generator counts the blocks.
Most placeable blocks stack to 64, and some items differ (Minecraft Wiki). A block grid only approximates a curve, so the dome is the nearest set of whole blocks under the stated rule.
Questions
Why is a hollow dome open underneath?
Hollow keeps blocks that touch empty space around the full sphere. Below the base layer is the lower half of the sphere, which is not built, so the base layer is not treated as having empty space beneath it and stays a ring.
Does the wall change the dome?
No. The wall only adds copies of the base layer underneath, so the dome blocks stay the same.
Not an official Minecraft product, and not affiliated with Mojang or Microsoft. See also the circle chart.