Bold Pinwheel Play Mat
Bold Pinwheel Play Mat finishes at 40 x 48 in from 4 x 5 blocks in 4 fabrics.
What was checked: the pieces tiling each block, the block count and finished size, the yardage per fabric with the seam allowance.
- Finished size
- 40 × 48 in
- Blocks
- 4 × 5 blocks, each 8 in finished
- Seams
- 1/4 in
- Fabric width
- 42 in
- Fabrics
- 5
- Backing
- 2.8 yd
The first rows are free to read below. Every library pattern and its PDF are included with any plan.
- White quilting cotton
1.0 yd - Red quilting cotton
1.125 yd - Royal Blue quilting cotton
0.75 yd - Sunny Yellow quilting cotton
0.375 yd - Backing fabric
2.75 yd - Batting, at least 48 x 56 in
- Quilting thread
| Fabric | Buy | Cutting |
|---|---|---|
| White | 1.0 yd (needs 1.0) | 14 HST squares (pair with R, makes 28) 4.875 x 4.875 in (2 strips of 4.875 in); 14 HST squares (pair with B, makes 28) 4.875 x 4.875 in (2 strips of 4.875 in); 12 HST squares (pair with Y, makes 24) 4.875 x 4.875 in (2 strips of 4.875 in) |
| Red | 1.125 yd (needs 0.875) | 14 HST squares (pair with W, makes 28) 4.875 x 4.875 in (2 strips of 4.875 in); border: 4 strips 4.5 in x WOF |
Half-square triangles: pair the HST squares right sides together, draw the diagonal, sew 1/4 in either side, cut on the line, press, trim to 4.5 in.
Blocks:
- Block PR: W/R W|R / R|W R/W
Every library pattern and its PDF are included with any plan. The first rows, the supplies and the notes are free to read.
| Category | Item | Amount |
|---|---|---|
| fabric | White quilting cotton | 1.0 yd |
| fabric | Red quilting cotton | 1.125 yd |
| fabric | Royal Blue quilting cotton | 0.75 yd |
| fabric | Sunny Yellow quilting cotton | 0.375 yd |
| fabric | Backing fabric | 2.75 yd |
| notions | Batting, at least 48 x 56 in | 1 |
| notions | Quilting thread | 1 |
Inputs
Sizes are computed from these fixed inputs: wof (in) 42, seam (in) 0.25, target (in) 40, 48, size tol (in) 4. A different gauge or stock makes a different size; the counts do not change.
Brief
“Could you design a play mat quilt about 44 x 48 in using bold pinwheel blocks in red, royal blue and sunny yellow on a white background, with a wide border to frame it?”
Checks
The counts, part sizes and placement were checked by computation on 29 September 2026 (verified on attempt 2); the piece has not yet been made by hand. If yours comes out differently, tell us and we will look at it.
