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CraftShape

20 Block Circle Generator

A 20 block circle is the sweet spot for a round room you can actually furnish. The 2x2 center means it pairs neatly with a 2 wide central pillar, a staircase shaft or a fountain.

Controls

Dimensions

Dimensions

blocks

This page is preset to one size — change it freely to explore others.

blocks

Always exactly half the diameter. An odd diameter has a half-block radius but still uses one single centre block.

Walls

Walls

Fill mode
blocks
Appearance

Appearance

Block color

Mirror mode shows one quadrant only. Build it, then mirror it left/right and front/back for a perfectly symmetrical shape.

Circle Generator

20 x 20 · 60 blocks

Drag to pan, scroll or pinch to zoom, hover a cell for coordinates.

Build summary

Diameter
20
Radius
10.0
Total blocks
60
Rows used
20

Symmetry check: mirrors left to right and mirrors top to bottom.

Ring built between the outer edge and an inner edge 1 block inside it.

Row-by-row instructions

  1. Row 1:skip 7 spaces, place 6 blocks
  2. Row 2:skip 5 spaces, place 2 blocks, leave 6 spaces, place 2 blocks
  3. Row 3:skip 3 spaces, place 2 blocks, leave 10 spaces, place 2 blocks
  4. Row 4:skip 2 spaces, place 2 blocks, leave 12 spaces, place 2 blocks
  5. Row 5:skip 2 spaces, place 1 block, leave 14 spaces, place 1 block
  6. Row 6:skip 1 space, place 1 block, leave 16 spaces, place 1 block
  7. Row 7:skip 1 space, place 1 block, leave 16 spaces, place 1 block
  8. Row 8:place 1 block, leave 18 spaces, place 1 block
  9. Row 9:place 1 block, leave 18 spaces, place 1 block
  10. Row 10:place 1 block, leave 18 spaces, place 1 block
  11. Row 11:place 1 block, leave 18 spaces, place 1 block
  12. Row 12:place 1 block, leave 18 spaces, place 1 block
  13. Row 13:place 1 block, leave 18 spaces, place 1 block
  14. Row 14:skip 1 space, place 1 block, leave 16 spaces, place 1 block
  15. Row 15:skip 1 space, place 1 block, leave 16 spaces, place 1 block
  16. Row 16:skip 2 spaces, place 1 block, leave 14 spaces, place 1 block
  17. Row 17:skip 2 spaces, place 2 blocks, leave 12 spaces, place 2 blocks
  18. Row 18:skip 3 spaces, place 2 blocks, leave 10 spaces, place 2 blocks
  19. Row 19:skip 5 spaces, place 2 blocks, leave 6 spaces, place 2 blocks
  20. Row 20:skip 7 spaces, place 6 blocks

Block counts for a 20 block circle

  • Hollow outline (1 block wall): 60 blocks
  • Filled disc: 316 blocks
  • Widest row: 20 blocks
  • Center: a 2x2 center square

Building advice for this size

  • Build the four widest rows first — top, bottom, left and right — then fill the arcs between them.
  • With a 20 wide outline you can afford a 2 or even 3 block thick wall and still keep a 14 block interior.
  • Place torches every 6 blocks around the inside of the ring while you build; the curve makes it easy to lose your place.
  • Stack the same ring 4 to 6 layers high for a squat tower, or 20+ layers for a lighthouse.

Other circle sizes

Smaller: 15 block circle. Larger: 25 block circle. Or open the full circle generator for any diameter up to 256.

Frequently asked questions

How many blocks is a 20 block circle?
A hollow 20 block circle takes 60 blocks. Filled it takes 316 blocks. Add a wall thickness of 2 and the ring rises to roughly double the hollow count.
Can I make a 20 block circle in survival mode?
Yes. It needs one stack of blocks for the outline. Lay the ring on the ground first so you can check the shape from above before you build upwards.
How wide is the inside of a 20 block circle?
With a 1 block wall the usable interior is about 18 blocks across at the widest point, narrowing towards the edges of the curve.

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