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The quilt-math cheat sheet
The numbers you reach for at the cutting table, on one page. Print it, pin it by your machine, and stop re-deriving seven-eighths in your head. No sign-up — it's just yours.
The Quilt-Math Cheat Sheet
getsashing.com · free calculators & the Sashing app
Unit formulas (finished → cut)
| Unit | Cut |
|---|---|
| Square | finished + 1/2" |
| HST (2 at a time) | finished + 7/8", cut 1 diagonal |
| HST (8 at a time) | (finished + 7/8") × 2 |
| Hourglass (QST) | finished + 1 1/4", cut 2 diagonals |
| Flying geese (no-waste) | 1 lg: W + 1 1/4" · 4 sm: H + 7/8" |
| Side setting triangle | block × 1.414 + 1 1/4", 2 diagonals |
| Corner setting triangle | block × 0.707 + 7/8", 1 diagonal |
Standard quilt sizes
| Quilt | Size | Batting pack |
|---|---|---|
| Baby | 36 × 52 | 45 × 60 |
| Throw | 50 × 65 | 60 × 60 |
| Twin | 70 × 90 | 72 × 90 |
| Full | 85 × 100 | 81 × 96 |
| Queen | 90 × 100 | 90 × 108 |
| King | 105 × 100 | 120 × 120 |
Backing & batting: add ~4" per side (longarm: 4–6").
Binding quick table
2 1/2" strips, 40" usable width, includes 10" for joins.
| Quilt | Strips | Fabric |
|---|---|---|
| 36 × 52 | 5 | 3/8 yd |
| 50 × 65 | 6 | 1/2 yd |
| 70 × 90 | 9 | 5/8 yd |
| 90 × 100 | 10 | 3/4 yd |
| 105 × 100 | 11 | 3/4 yd |
Precut yields (5" squares example)
| Precut | Size | 5" squares |
|---|---|---|
| Fat quarter | 18 × 22 | 12 |
| Fat eighth | 9 × 22 | 4 |
| Charm pack (42) | 5 × 5 | 42 |
| Layer cake (42) | 10 × 10 | 168 |
Yardage: 1 yd of 40" usable = 8 strips at 4 1/2", or 56 five-inch squares.
All formulas assume a 1/4" seam allowance. Results are estimates — double-check your measurements before cutting. From getsashing.com, home of the free quilting calculators and the Sashing app for iOS.