108-inch quilt backing: yardage guide & examples
A 108-inch fabric label tells you the width of the roll, not how many yards to buy. Start with your quilt dimensions, the extra backing needed on each edge and the width you can actually use.
Calculate backing for your own measurements →
How to calculate yardage for wide backing
- Measure the quilt top. Add twice your chosen edge allowance to both dimensions. A 4-inch allowance on each edge adds 8 inches to the width and 8 inches to the length.
- Measure usable fabric width, excluding selvages and any unusable edges. Do not automatically enter 108 just because the label says 108.
- Check whether either backing dimension fits across that usable width. If it does, the other dimension is the length you need along the roll.
- Divide that cut length by 36 to get yards. Round upward to an increment the shop sells. Add any separate allowance needed for shrinkage, squaring up or matching the print.
If neither backing dimension fits, a single piece will not cover the project. Use the calculator to compare joined panels. If both dimensions fit, either orientation can work geometrically, but your print may rule one out.
Four inches per edge is an example, not a requirement for every project. APQS’s loading instructions use extra backing on all sides and note that some mounting systems need more. Check the allowance for your actual quilting setup.
How much backing for a 90 × 96 inch quilt?
For this queen-size project example, assume a measured top of 90 × 96 inches, 4 inches extra per edge and fabric with 106 usable inches. The 106-inch measurement is an example, not a standard deduction from every 108-inch fabric. Bed-size names alone are not measurements.
The backing target is 98 × 104 inches. Both dimensions fit within the usable width:
- Unrotated: place the 98-inch backing width across the fabric. Cut 104 inches along the roll. 104 ÷ 36 = 2.888… yards; round up to 3 yards.
- Rotated: place the 104-inch backing length across the fabric. Cut 98 inches along the roll. 98 ÷ 36 = 2.722… yards; round up to 2¾ yards.
Neither option needs a seam in this example. Rotating saves ¼ yard before any other allowances. It is only suitable if the fabric design can run in that direction.
Wide backing versus 42-inch usable fabric
These are QuiltMetrix calculation examples, not universal bed-size recommendations. Each uses 4 inches extra per edge, ½-inch seams where panels are joined, full-width panels and the lower-yardage orientation. Purchases round up to ⅛ yard. Neither layout includes shrinkage or pattern matching.
| Quilt top (in) | 42 usable inches | 106 usable inches |
|---|---|---|
| 60 × 80 | 5 yd · 2 panels | 2 yd · 1 piece |
| 90 × 96 | 8¼ yd · 3 panels | 2¾ yd · 1 piece |
| 100 × 110 | 9 yd · 3 panels | 6 yd · 2 panels |
The last row needs a 108 × 118 inch backing. Neither dimension fits across 106 usable inches, so wide fabric still needs joining. These are full-width panel estimates; a separately designed pieced backing may use offcuts differently. Fewer yards also do not necessarily mean a lower price: wide and narrow fabrics may have different prices per yard.
Can you rotate directional backing fabric?
Not always. Rotating a panel also rotates its printed design relative to the quilt. Check the actual motif and which edge of the quilt will be the top. BackSide Fabrics’ wide-backing guidance also identifies directional designs as a reason not to turn the fabric.
Our calculator compares geometry, not the appearance of your print. Read the cut dimensions for both orientations. If the cheaper layout turns the design sideways, choose the other layout or plan a different construction.
Apply the example to your project
Open the quilt backing calculator, enter your measured top and usable fabric width, then adjust the edge and seam allowances. The result shows both directions and their panel cuts. You can switch to centimetres; one inch equals 2.54 cm. For the outside edge of the finished quilt, use the separate binding calculator.