Quilt to Size / Patterns / Half square triangle zigzag
Half square triangle zigzag quilt, king size
20 by 20 blocks of 5", a 5" border, finished at 110" x 110". Half square triangles set into zigzags.
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This pattern, in your colors
- The cover with your quilt, colored as you set it here
- Step by step piecing for the half square triangle zigzag block, with the block diagram
- The quilt map: all 400 blocks by row and column
- Fabric, cutting, borders, backing and binding, to the inch
King size. One payment, no subscription. Measured twice: if a measurement is wrong, we correct it.
Fabric requirements
Based on 42" of usable width of fabric (WOF). Rounded up to the next 1/8 yard.
| Prints | 4 7/8 yd |
|---|---|
| Background | 4 7/8 yd |
| Border | 1 7/8 yd |
| Binding | 7/8 yd |
| Backing | 9 7/8 yd |
| Batting | 118" x 118" |
The block
5" finished (5 1/2" with seam allowances). 2 patches. Make 400.
Cutting chart
Cut strips across the width of fabric, then subcut. All measurements include 1/4" seam allowances.
Prints4 7/8 yd
Cut 29 strips 5 7/8" x WOF.
- Subcut 200 5 7/8" squares, cut once on the diagonal for half square triangles
Background4 7/8 yd
Cut 29 strips 5 7/8" x WOF.
- Subcut 200 5 7/8" squares, cut once on the diagonal for half square triangles
Border1 7/8 yd
Cut 11 strips 5 1/2" x WOF; join them end to end, then cut the four borders to length.
Binding7/8 yd
Cut 11 strips 2 1/2" x WOF; join them on the diagonal and press in half lengthwise.
Backing, binding, batting
Backing
9 7/8 yd of 42" fabric: 3 panels 118" long, seamed lengthwise, for a 118" x 118" back (4" extra on every side for the longarm or your frame).
Binding
11 strips 2 1/2" x WOF, joined on the diagonal and folded in half: 440" around the quilt plus 12" for the corners and the join.
Batting
A piece at least 118" x 118".
Different size? Backing calculator ยท Binding calculator
On the notions wall
What this quilt takes beyond the fabric. Prices on Amazon as of October 22, 2026.
-
Warm & Natural cotton batting, king 120" x 124"
Covers your 118" x 118" batting piece, 4" past the quilt on every side.
$59.40
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OLFA 45mm rotary cutter (RTY-2/DX)
The standard size for cutting strips up to six layers deep. The blade retracts when you let go.
$20.99
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OLFA 24" x 36" self-healing mat
Long enough to cut a strip folded once across the width of fabric in one pass.
$59.99
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Omnigrip 6" x 24" ruler
Every strip in the cutting chart is cut against a 24" ruler. The grip keeps it from sliding.
$26.47
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