31 block circle in Minecraft (radius 15)
A 31-block-wide circle takes 84 blocks for a 1-block outline and 749 to fill it. Go around each quarter in runs of 7·3·2·1·1·1·1·2·3·7. The centre is a single block, because 31 is odd.
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| Diameter | 31 blocks (radius 15 from the centre block) |
| Outline, thin wall (diagonal steps) | 84 |
| Outline, thick wall (no diagonal gaps) | 120 |
| Filled disc | 749 |
| Flat edge on each side | 7 |
| 5-high tower wall | 420 · 6×64 + 36 |
Rule: a block counts when its centre lies inside the circle, the same grid the game uses. Checked 21 Oct 2026.
How to build it
- Mark the centre block. Count 15 blocks out from the centre block in all four directions and mark those four points.
- Place the four flat edges of 7. Centre each flat edge on one of the four points: 3 blocks either side of it.
- Fill each corner with 3·2·1·1·1·1·2·3. After each run, step one block diagonally inward and place the next run. Do the same in all four corners.
- Repeat for each layer. A straight wall is the same ring on every layer (a 5-high wall takes 420 blocks). A dome or sphere shrinks the ring as it goes up.
All 31 rows, north to south
Each row lists its runs of blocks from west to east; "2-2" means 2 blocks, a gap, then 2 blocks.
- 7
- 3-3
- 2-2
- 1-1
- 1-1
- 1-1
- 1-1
- 1-1
- 1-1
- 1-1
- 1-1
- 1-1
- 1-1
- 1-1
- 1-1
- 1-1
- 1-1
- 1-1
- 1-1
- 1-1
- 1-1
- 1-1
- 1-1
- 1-1
- 1-1
- 1-1
- 1-1
- 1-1
- 2-2
- 3-3
- 7
Nearby sizes
| Diameter | Outline | Filled | Quarter pattern |
|---|---|---|---|
| 28 | 76 | 616 | 8-2-2-1-1-1-2-2-8 |
| 29 | 80 | 665 | 7-3-2-1-1-1-2-3-7 |
| 30 | 84 | 716 | 8-3-1-2-1-2-1-3-8 |
| 31 | 84 | 749 | 7-3-2-1-1-1-1-2-3-7 |
| 32 | 88 | 812 | 8-3-2-1-1-1-1-2-3-8 |
| 33 | 92 | 861 | 9-2-2-2-1-1-2-2-2-9 |
| 34 | 96 | 912 | 8-3-2-1-2-2-1-2-3-8 |
Every size from 5 to 128 in one table · How to build a perfect circle
Questions
How many blocks is a 31 block circle?
84 blocks for a 1-block outline with diagonal steps, 120 for an outline with no diagonal gaps, and 749 for a filled disc.
Should I build 31 or 30?
31 is odd, so the circle has one centre block: doors, beacons and pillars line up with the middle. 30 has a 2×2 centre instead.
How many blocks for a 31 sphere or dome?
A hollow 31 block sphere with a 1-block shell takes 2,382 blocks; a hollow 31 dome (16 layers, open at the bottom) takes 1,233. Plan them layer by layer in the sphere generator or the dome generator.
Thin or thick outline?
A thin outline (84 blocks) steps diagonally, so mobs and water can slip through the corners. A thick outline (120 blocks) adds a block at every step, which makes a sealed wall.