How do I build a circle out of blocks, row by row?

Enter the diameter in Width and read the Rows pane from top to bottom. X marks a block; dots mark empty cells. Each row includes its block count. Past 120 blocks wide, the guide names occupied columns instead of printing a long picture. The total is the number of blocks marked in the current grid.

What happens on an even width, like 16?

An even diameter has its center between the two middle columns, keeping both halves symmetric. A 16-wide outline has 44 blocks and a top row of 6; a 15-wide outline has 40 blocks and a top row of 5. A grid is a block approximation to a smooth circle.

How many blocks does a circle of a given diameter need?

It depends on the style as much as the size. A 15 wide outline is 40 blocks, the same circle two blocks thick is 76, and filled in solid it is 177. An 11 wide outline is 28. Rather than memorising a table, type the size: the total is printed under the row list for whatever width and height you enter, up to 501.

What is the difference between outline, thick and filled?

Outline keeps the single ring of blocks at the edge of the circle, which is the usual wall. Thick keeps that ring and the next one inside it, so the wall is two blocks deep wherever the circle is wide enough to hold two rings; on a very small grid the second ring has nowhere to go and thick comes out the same as the outline. Filled keeps every block inside the circle, which is what a floor or a roof needs. A 15 wide circle is 40 blocks as an outline, 76 thick and 177 filled, and the grid, the row list and the total all follow whichever you pick.

Is this connected to Minecraft or Mojang?

No. It is an independent tool that draws a circle on a square grid, and Minecraft is named only to say what that output suits. It is not made by, endorsed by or connected to Mojang, it reads nothing from your game or your account, and the same grid works for any square-grid build: pixel art, perler beads, cross stitch or a tile floor.

What is the largest circle it will draw, and does it upload anything?

Sides run from 1 to 501 blocks, and a side outside that range is refused with a message naming the limit and the number you typed, rather than being quietly trimmed to something smaller. Nothing is uploaded and no account is needed: the grid, the row list, the CSV and the PNG are all worked out in your browser.

Does the grid work in Minecraft Bedrock or on a vertical wall?

The output is a row-by-row square-block pattern, independent of a game edition. It works for manual placement in Java or Bedrock and can be read across a floor or a vertical wall. It does not create game commands, mod files or schematics.

Can I make an oval or an ocean-monument outline?

Choose Ellipse to set different widths and heights, or use Circle for equal sides. For an outline around a structure, measure the diameter you want in blocks and enter it; the tool does not read your world or infer the structure size. It draws a flat pattern, not a dome or sphere.

Block Circle Generator

Draw a block circle to the size you set and get a count of the blocks in every row. Most block circle pages draw the shape and stop. This one prints the build guide in the Rows pane: every row as a picture, the number of blocks that row needs, and a total that is the same number as the filled cells in the CSV and the PNG, so the pile you gather is the pile you place. Sides run from 1 to 501, a width and a height that differ give an ellipse instead of a circle, and an even width is centred on the line between the two middle columns so it stays symmetric on both axes rather than leaning a block to one side.

Rows15 × 15 · outline

row 1·····XXXXX·····5
row 2···XX·····XX···4
row 3··X·········X··2
row 4·X···········X·2
row 5·X···········X·2
row 6X·············X2
row 7X·············X2
row 8X·············X2
row 9X·············X2
row 10X·············X2
row 11·X···········X·2
row 12·X···········X·2
row 13··X·········X··2
row 14···XX·····XX···4
row 15·····XXXXX·····5

Blocks needed40

Width

Height

Shape

Style

15 by 15 block circle, outline style, 40 blocks. The widest row is 5 blocks, and the row list above adds up to the same 40.

Odd width, 15one centre block
40 blocks, 15 rows
Even width, 16the centre falls between blocks
44 blocks, 16 rows
Width 501the supported maximum
1416 blocks, 501 rows

Accuracy. Blocks are chosen by distance from the centre of the grid, and the total always equals the filled cells in the row list and the export. Even widths have no single centre block, so the circle is centred between blocks and stays symmetric on both axes. Minecraft is named as what the output suits: this is not made by or connected to Mojang.

Common questions

How do I build a circle out of blocks, row by row?: Enter the diameter in Width and read the Rows pane from top to bottom. X marks a block; dots mark empty cells. Each row includes its block count. Past 120 blocks wide, the guide names occupied columns instead of printing a long picture. The total is the number of blocks marked in the current grid.
What happens on an even width, like 16?: An even diameter has its center between the two middle columns, keeping both halves symmetric. A 16-wide outline has 44 blocks and a top row of 6; a 15-wide outline has 40 blocks and a top row of 5. A grid is a block approximation to a smooth circle.
How many blocks does a circle of a given diameter need?: It depends on the style as much as the size. A 15 wide outline is 40 blocks, the same circle two blocks thick is 76, and filled in solid it is 177. An 11 wide outline is 28. Rather than memorising a table, type the size: the total is printed under the row list for whatever width and height you enter, up to 501.
What is the difference between outline, thick and filled?: Outline keeps the single ring of blocks at the edge of the circle, which is the usual wall. Thick keeps that ring and the next one inside it, so the wall is two blocks deep wherever the circle is wide enough to hold two rings; on a very small grid the second ring has nowhere to go and thick comes out the same as the outline. Filled keeps every block inside the circle, which is what a floor or a roof needs. A 15 wide circle is 40 blocks as an outline, 76 thick and 177 filled, and the grid, the row list and the total all follow whichever you pick.
Is this connected to Minecraft or Mojang?: No. It is an independent tool that draws a circle on a square grid, and Minecraft is named only to say what that output suits. It is not made by, endorsed by or connected to Mojang, it reads nothing from your game or your account, and the same grid works for any square-grid build: pixel art, perler beads, cross stitch or a tile floor.
What is the largest circle it will draw, and does it upload anything?: Sides run from 1 to 501 blocks, and a side outside that range is refused with a message naming the limit and the number you typed, rather than being quietly trimmed to something smaller. Nothing is uploaded and no account is needed: the grid, the row list, the CSV and the PNG are all worked out in your browser.
Does the grid work in Minecraft Bedrock or on a vertical wall?: The output is a row-by-row square-block pattern, independent of a game edition. It works for manual placement in Java or Bedrock and can be read across a floor or a vertical wall. It does not create game commands, mod files or schematics.
Can I make an oval or an ocean-monument outline?: Choose Ellipse to set different widths and heights, or use Circle for equal sides. For an outline around a structure, measure the diameter you want in blocks and enter it; the tool does not read your world or infer the structure size. It draws a flat pattern, not a dome or sphere.

Blocks are chosen by distance from the centre of the grid, and the total always equals the filled cells in the row list and the export. Even widths have no single centre block, so the circle is centred between blocks and stays symmetric on both axes. Minecraft is named as what the output suits: this is not made by or connected to Mojang.