Format chart
These are naming and purchase-format examples, not guaranteed usable dimensions. Product names and package contents vary, so check the actual cuttable size and eligible count for the package you have.
| Format | Stated size | Check the package |
|---|---|---|
| Fat quarter | 18 × 21–22 in | Examples vary by product; bundle contents vary. |
| Fat eighth | 9 × 21 in or 11 × 18 in | These are different shapes; check the product. |
| 5 in squares / Charm Pack | 5 × 5 in | Example pack: 42 pieces. Verify the product and eligible fabrics. |
| 10 in squares / Layer Cake | 10 × 10 in | Example pack: 42 pieces. Verify the product and eligible fabrics. |
| 2 1/2 in squares / Mini Charm | 2 1/2 × 2 1/2 in | Example pack: 42 pieces. Verify the product and eligible fabrics. |
| 2 1/2 in strips / Jelly Roll | 2 1/2 in × WOF | Example pack: 40 strips. Numeric usable strip length is not supplied. |
Measure usable fabric
A product label does not establish how much is cuttable. Check selvage, pinking and any unusable edges before entering usable width and length. A stated 2 1/2 in strip width or “WOF” length does not supply an automatic deduction or an exact usable length.
No trimming, shrinkage or cutting-loss percentage is inferred from this chart. If the pattern needs a specific cut size, check that size against the piece you will actually cut.
Check pack contents
Count the eligible pieces for the fabric role you are planning. A package containing 42 squares does not necessarily contain 42 squares that meet a particular fabric, color or cut requirement. Some packages repeat prints; contents vary. Confirm the seller’s description.
The pack-purchase calculator asks for eligible pieces per pack separately. It supports one repeated rectangular cut and allowed uniform rotation; it does not allocate colors, select designs or optimize mixed-size cuts.
Fat quarter or quarter yard
A conventional quarter-yard cut runs 9 in along the full fabric width. A fat quarter uses a different rectangle, approximately half the width by 18 in. Similar nominal area does not make the two shapes interchangeable for a cut list. Check usable dimensions instead of substituting a yardage equivalent.
Fat-eighth shapes and bundle counts also need confirmation; the 9 × 21 in entry is one example, not a universal specification.