Try it in your colours
Tap a colourway, or pick each fabric. The film at the top changes too.
Cut sizes for one Bold Diagonal block
Pick the finished size. Every cut includes the ¼″ seam allowance.
| Piece | Cut | Qty |
|---|---|---|
| Half-square trianglebackground fabric | 6⅞″ × 6⅞″ | 1 |
| Half-square trianglemain fabric | 6⅞″ × 6⅞″ | 1 |
| Piece | Cut | Qty |
|---|---|---|
| Half-square trianglebackground fabric | 9⅞″ × 9⅞″ | 1 |
| Half-square trianglemain fabric | 9⅞″ × 9⅞″ | 1 |
| Piece | Cut | Qty |
|---|---|---|
| Half-square trianglebackground fabric | 12⅞″ × 12⅞″ | 1 |
| Half-square trianglemain fabric | 12⅞″ × 12⅞″ | 1 |
In the film the triangle squares start a little big and get trimmed to size, which is the easy way to sharp points. The chart gives the exact cut if you’d rather skip the trim.
Good to know
What size should I make a Bold Diagonal block?
Any size that suits your quilt. 12″ is the easiest to sew, and 9″ or 6″ look lovely in a busy, scrappy quilt. It sits on a 4 by 4 grid, so a finished size that divides by 4 gives you friendly cutting numbers. The cut sizes for all three are on this page.
How many Bold Diagonal blocks do I need for a quilt?
At 12″ you need 9 blocks for a wall quilt, 12 for a baby quilt, 30 for a throw, 48 for a twin quilt and 72 for a queen quilt. Sashing or a border between them means fewer blocks for the same size.
Is the Bold Diagonal good for a beginner?
Yes, if you take it slowly. The one new skill is the half-square triangles, and the film at the top shows every cut, seam and press.
What's the trick to a neat Bold Diagonal?
Handle the bias edge gently and starch the fabric first. The diagonal stretches if you tug it.
Coffee and a few seams?
Start a quilt with the Bold Diagonal and we’ll walk you through every cut and seam.
Sew a Bold Diagonal quilt