A charm pack is 42 five-inch squares that finish at 4½. Enter your quilt size, the squares, the packs, and the grid come back, with the option of sashing to stretch the packs further.
Your Quilt
You Need
4charm packs
154 squares · 11 × 14 grid · finishes 49.5 × 63 in
Short a pack? An inch of sashing stretches each repeat to 5½″ and usually saves one.
- Squares needed154
- Packs of 424 (14 spare)
- Finished size49.5 × 63 in
The Formula
squares = (width ÷ repeat) × (length ÷ repeat), repeat = 4½ + sashing · packs = ⌈squares ÷ 42⌉Five-inch charms lose ½ in to seams and finish at 4½. Sashing stretches every repeat, which is the thrifty trick: an inch of sashing turns a repeat from 4½ to 5½ and cuts the square count by a third.
Worked Example
A throw at about 50 × 63, charms edge to edge:
- Grid: 11 × 14 = 154 squares (finishing 49½ × 63).
- Packs: 154 ÷ 42 → 4 packs, with 14 squares spare for the label and a pillow.
- With 1 in sashing: a 9 × 12 grid finishes 48½ × 65 from 3 packs, plus about 1⅛ yd of sashing fabric.
Packs by Quilt Size
Edge-to-edge charms, 4½ in finished, computed by the calculator above.
| Quilt | Grid | Squares | Packs |
|---|---|---|---|
| Baby | 8 × 10 | 80 | 2 |
| Throw | 11 × 14 | 154 | 4 |
| Twin | 15 × 20 | 300 | 8 |
| Full | 19 × 20 | 380 | 10 |
| Queen | 20 × 22 | 440 | 11 |
What’s in the Precuts
- Charm pack: 42 squares, 5 × 5 in, usually one of each print in a collection.
- Mini charms: 42 at 2½ in: same math at a 2 in finished repeat.
- Layer cake: 42 at 10 in; one layer cake cuts into four charm packs’ worth of 5 in squares.
Assumptions and Defaults
- Simple patchwork: every square used whole. HST charm patterns spend two squares per unit; double the count.
- Grids round to whole squares and the true finished size reports beside the target.
- Pack counts assume 42 squares; a few makers pack 40: read the wrapper.
Charm Pack Questions, Answered
How many charm packs do I need for a throw quilt?
A throw quilt sewn edge to edge needs four charm packs, which gives about 154 squares at 4½ in finished. Add an inch of sashing between the squares and three packs cover the same throw, which is the stretching method most charm quilts rely on.
How many charm packs do I need for a baby quilt?
A baby quilt needs two charm packs for an 8 × 10 grid of 80 squares, which finishes at 36 × 45 in. If you add sashing, a single pack makes a smaller version about 34 in square, a nice size for a play mat or a stroller quilt.
What size is a charm square after sewing?
A charm square finishes at 4½ in after sewing, because the 5 in cut loses ¼ in to the seam on each side. Plan every grid on that finished 4½ in measurement rather than the 5 in cut, and the quilt will come out the size you expect.
Can I cut my own charm squares?
Yes, you can cut your own charm squares, and one yard of fabric yields 56 five-inch squares. A precut pack mainly buys variety, 42 different prints without buying 42 fabrics, and the fabric calculator prices the cut-your-own route if you prefer it.