Quilt blocks
Quilt Block Sizes: Finished, Unfinished and Blocks per Quilt
The most common quilt block sizes are 6, 9, 10 and 12 inches finished. A block is cut 1/2 inch larger than its finished size, so a 12 inch block measures 12 1/2 inches before it is sewn in. Sizes divisible by 2, 3 and 4, like 12 inches, work with the most block designs.
| Finished block | Unfinished | Even grids | Throw (no sashing) | Queen (no sashing) |
|---|---|---|---|---|
| 4 inch | 4 1/2 in | 2x2, 4x4 | 208 | 552 |
| 5 inch | 5 1/2 in | 2x2, 4x4, 5x5 | 130 | 342 |
| 6 inch | 6 1/2 in | 2x2, 3x3, 4x4, 6x6 | 88 | 240 |
| 8 inch | 8 1/2 in | 2x2, 4x4 | 48 | 132 |
| 9 inch | 9 1/2 in | 2x2, 3x3, 4x4, 6x6 | 42 | 110 |
| 10 inch | 10 1/2 in | 2x2, 4x4, 5x5 | 35 | 90 |
| 12 inch | 12 1/2 in | 2x2, 3x3, 4x4, 6x6 | 20 | 64 |
| 14 inch | 14 1/2 in | 2x2, 4x4 | 20 | 42 |
| 15 inch | 15 1/2 in | 2x2, 3x3, 4x4, 5x5, 6x6 | 12 | 36 |
| 16 inch | 16 1/2 in | 2x2, 4x4 | 12 | 36 |
| 18 inch | 18 1/2 in | 2x2, 3x3, 4x4, 6x6 | 12 | 25 |
| 20 inch | 20 1/2 in | 2x2, 4x4, 5x5 | 9 | 25 |
| 24 inch | 24 1/2 in | 2x2, 3x3, 4x4, 6x6 | 6 | 16 |
The chart above covers all 13 standard block sizes, each cut 1/2 inch larger than it finishes: a 12 inch block is cut 12 1/2 inches and fills a queen quilt with 64 blocks, while a 6 inch block takes 240.
Try any block size and layout in the quilt block size calculator or the blocks needed calculator. Most blocks are pieced from smaller units, so the half square triangle size chart and the flying geese size chart give the cut sizes that go inside them.
Frequently asked questions
What are the most common quilt block sizes?
The most common finished quilt block sizes are 6, 9, 10 and 12 inches, and 12 inches is the workhorse because it divides evenly by 2, 3 and 4. Every block is cut 1/2 inch larger than its finished size, so a 12 inch block is cut 12 1/2 inches. A 12 inch block fills a queen quilt with 64 blocks.
How big should a quilt block be?
Pick the block size from the quilt you want and the piecing you enjoy: most patterns land between 6 and 12 inches finished. Larger blocks finish faster, since a queen takes 64 blocks at 12 inches but 240 at 6 inches. Smaller blocks show more detail and are less forgiving of a wide seam allowance.
What is the difference between a finished and an unfinished quilt block?
The finished size is what you see once the block is sewn into the quilt. The unfinished size is 1/2 inch larger, because each of the four edges carries a 1/4 inch seam allowance that disappears into the seams. A 12 inch finished block is therefore trimmed to 12 1/2 inches before it is joined to its neighbors.
What size quilt block is easiest for a beginner?
A 10 or 12 inch block is the friendliest starting point, because fewer, larger pieces mean fewer seams where small errors can add up. A 12 inch block needs only 64 blocks for a queen quilt. Sew one test block and measure it before cutting the rest, because a slightly wide seam allowance multiplies across every row.
Researched from manufacturer specifications, owner manuals and verified owner reviews, not hands-on testing, and not professional advice. As an Amazon Associate, Cozy Stitchery earns from qualifying purchases.
