21 block circle in Minecraft (radius 10)
A 21-block-wide circle takes 56 blocks for a 1-block outline and 349 to fill it. Go around each quarter in runs of 7·2·1·1·1·2·7. The centre is a single block, because 21 is odd.
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| Diameter | 21 blocks (radius 10 from the centre block) |
| Outline, thin wall (diagonal steps) | 56 |
| Outline, thick wall (no diagonal gaps) | 80 |
| Filled disc | 349 |
| Flat edge on each side | 7 |
| 5-high tower wall | 280 · 4×64 + 24 |
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 10 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 2·1·1·1·2. 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 280 blocks). A dome or sphere shrinks the ring as it goes up.
All 21 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
- 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
- 2-2
- 7
Nearby sizes
| Diameter | Outline | Filled | Quarter pattern |
|---|---|---|---|
| 18 | 48 | 256 | 6-2-1-1-2-6 |
| 19 | 52 | 293 | 7-2-1-1-2-7 |
| 20 | 56 | 316 | 6-2-2-2-2-6 |
| 21 | 56 | 349 | 7-2-1-1-1-2-7 |
| 22 | 60 | 384 | 6-3-1-1-1-3-6 |
| 23 | 64 | 421 | 7-2-2-1-2-2-7 |
| 24 | 64 | 448 | 6-3-1-1-1-1-3-6 |
Every size from 5 to 128 in one table · How to build a perfect circle
Questions
How many blocks is a 21 block circle?
56 blocks for a 1-block outline with diagonal steps, 80 for an outline with no diagonal gaps, and 349 for a filled disc.
Should I build 21 or 20?
21 is odd, so the circle has one centre block: doors, beacons and pillars line up with the middle. 20 has a 2×2 centre instead.
How many blocks for a 21 sphere or dome?
A hollow 21 block sphere with a 1-block shell takes 1,082 blocks; a hollow 21 dome (11 layers, open at the bottom) takes 553. Plan them layer by layer in the sphere generator or the dome generator.
Thin or thick outline?
A thin outline (56 blocks) steps diagonally, so mobs and water can slip through the corners. A thick outline (80 blocks) adds a block at every step, which makes a sealed wall.