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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

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