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CraftShape

Minecraft Arch Generator

Front elevation of a Roman, gothic, shallow or horseshoe arch, with the exact half-width for every row so both sides always mirror.

Arch Generator — 13 x 14 blocks

Controls

Opening

Opening

blocks

The clear space you want to walk or sail through.

blocks
Arch

Arch

blocks
blocks

How many identical slices to build back from the front face.

Appearance

Appearance

Block color

Arch front elevation

13 x 14 blocks · 180 blocks

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

Building this with friends?

Launch a private Minecraft server, invite your team, and bring this blueprint to life together.

Read our plain-English guide first — no offer attached.

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Build summary

Overall size
13 x 14
Opening
9 x 12
Blocks per slice
60
Depth
3 slices
Total blocks
180
Rows are numbered from the bottom of the opening upwards. Build one slice, then repeat it for the depth.

Row-by-row instructions

  1. Row 1:place 2 blocks, leave 9 spaces, place 2 blocks
  2. Row 2:place 2 blocks, leave 9 spaces, place 2 blocks
  3. Row 3:place 2 blocks, leave 9 spaces, place 2 blocks
  4. Row 4:place 2 blocks, leave 9 spaces, place 2 blocks
  5. Row 5:place 2 blocks, leave 9 spaces, place 2 blocks
  6. Row 6:place 2 blocks, leave 9 spaces, place 2 blocks
  7. Row 7:place 2 blocks, leave 9 spaces, place 2 blocks
  8. Row 8:place 2 blocks, leave 9 spaces, place 2 blocks
  9. Row 9:place 2 blocks, leave 9 spaces, place 2 blocks
  10. Row 10:place 2 blocks, leave 9 spaces, place 2 blocks
  11. Row 11:skip 1 space, place 2 blocks, leave 7 spaces, place 2 blocks
  12. Row 12:skip 2 spaces, place 2 blocks, leave 5 spaces, place 2 blocks
  13. Row 13:skip 3 spaces, place 7 blocks
  14. Row 14:skip 4 spaces, place 5 blocks

How the arch curve is worked out

For every row of the opening, the generator calculates how wide the gap should be at that height and keeps the surrounding blocks. A semicircular arch uses a circular rise of half the opening width; a shallow arch uses a quarter; a horseshoe continues past the halfway point so the opening narrows again near the bottom; and a pointed arch uses two circular curves that meet at the apex.

Building an arch without scaffolding problems

  1. Mark the overall width on the ground — opening plus twice the thickness.
  2. Build the two straight legs up to where the curve starts.
  3. Work up both sides at the same time, one row at a time, so any mistake shows immediately.
  4. Place the keystone (the top centre) last.
  5. Repeat the whole slice for each block of depth.

Arcades and bridges

Repeating one arch with a pillar between each is what makes aqueducts and cloisters read correctly. Keep the spacing constant — a pillar equal to the arch thickness is a safe rule. For a full crossing, use the bridge arc generator instead, which includes the deck.

Frequently asked questions

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