How to use the circle generator
- Pick a shape. Circle and Oval are flat, for floors, towers, ponds and arena walls. Sphere, Dome and Torus are 3D and come with a layer slider and a 3D preview.
- Set the size in blocks. Type a number or use the − and + buttons. Ovals take a width and a length; a torus (a ring or doughnut) takes its outer diameter and the thickness of its tube. Flat shapes go up to 256 blocks across, 3D shapes up to 128.
- Choose the fill. Filled (or Solid) gives every block inside the shape. Thick and Thin outlines, or shells for 3D shapes, give only the wall.
- Build from the grid. The numbers along the edges count blocks from the centre, and the dashed lines mark the centre. Tap or point at any square to see its position. For a sphere or dome, start at layer 1 and step up one layer at a time.
- Take it with you. Download PDF prints the plan with blocks at least 4 mm wide, one page per layer for 3D shapes and in parts for big grids (or just one quarter, or one layer), and Share result copies a link that opens the same shape for a friend.
Reading the grid
Each square is one block seen from above. Dark green squares are the blocks of the layer you are looking at. On 3D shapes, light green squares show where the layer below sits, so you can see how far each new ring steps in or out. The darker grid lines fall every 5 blocks counted from the centre, which makes long runs easy to count off on the ground.
The total above the grid counts every block in the shape and converts it to stacks of 64, the stack size of most building blocks. Open Blocks in each layer under the grid to see how many you need for each layer, or Blocks in each row for a flat shape, so you can fill your inventory one layer at a time instead of carrying the whole build.
Odd or even: where is the centre?
With an odd diameter, such as 21, the shape has a single centre block. Mark it first (a different block or a torch works) and count out from it. With an even diameter, such as 20, the centre is the corner where four blocks meet, so the shape is built around a 2×2 middle. Even circles suit a 2×2 pillar, a double door or a big tree trunk in the middle; odd ones suit a single beacon, a fountain jet or a spiral staircase around one block.
Thick or thin outline?
A thin outline keeps only the blocks that share a side with the outside. It uses the fewest blocks, and its stair steps touch at the corners, which looks the smoothest from a distance. A thick outline adds the blocks that only touch the outside at a corner, so there are no diagonal gaps: the wall reads as one solid band up close, and nothing can be seen through the corners. For spheres and domes, both shells are sealed: water can't flow out and nothing can walk through, because every gap is covered by a block above, below or beside it.
Tips for big round builds
- Build the middle layer first on a sphere. It is the widest ring, and every other layer sits inside it, so it tells you early whether the build fits your space.
- Use the mirror. A sphere's top half repeats its bottom half, which the layer label points out (“same as layer 17”). The PDF prints each repeated layer only once.
- Mark the quarter points. Place the 4 blocks at the far ends of the centre lines first. Every quarter of a circle is the same, so you can build one quarter and copy it.
- Pick a size with room for the inside. A shell dome 31 blocks across has a floor about 29 blocks wide inside. Check the 3D preview with Hide layers above ticked to see the room you'll have.
- Plan on paper. For a whole base, sketch the layout on printable graph paper with one square per block, then generate each round part here.
How the shapes are worked out
A block is part of the shape when its centre lies inside the exact shape: x²/a² + z²/b² ≤ 1 for a circle or oval, the same with a third axis for a sphere, and the distance from the ring's centre line for a torus. A dome is the top half of the sphere of the same diameter, so a dome and a sphere of the same size match layer for layer. Outlines keep the blocks that touch a block outside the shape. Everything is calculated in your browser, and the same rules draw the grid, the 3D preview, the counts and the PDF, so they always agree.
Need a quick random pick for who builds which part? Spin the wheel spinner or roll the dice roller.
This is an independent, free building helper. Not an official Minecraft product. Not approved by or associated with Mojang or Microsoft. Stack size as listed on the Minecraft Wiki's inventory page (checked October 2026): most items stack to 64.