Enter Quilt Sashing Details
Example Data Table
| Rows |
Columns |
Block Size |
Sashing |
Outer Sashing |
Cornerstones |
Expected Fabric |
| 4 |
4 |
10 in × 10 in |
2 in |
No |
No |
About 0.67 yd |
| 5 |
4 |
10 in × 10 in |
2 in |
Yes |
Yes |
About 1.15 yd |
| 6 |
5 |
9 in × 9 in |
1.5 in |
Yes |
No |
About 1.00 yd |
Formula Used
Cut sashing width = finished sashing width + 2 × seam allowance.
Finished quilt width = columns × block width + internal sashing + optional outer sashing.
Finished quilt height = rows × block height + internal sashing + optional outer sashing.
Vertical sashing pieces = sashing columns × block rows.
Horizontal sashing pieces depend on cornerstone choice. Without cornerstones, each horizontal row is treated as one long strip. With cornerstones, horizontal rows are split by block width.
WOF strips = total linear sashing length ÷ usable fabric width, rounded up.
Recommended yardage = WOF strips × cut strip width ÷ 36 × waste factor.
How to Use This Calculator
- Choose inches or centimeters.
- Enter the number of quilt block rows and columns.
- Add the finished block width and height.
- Enter your preferred finished sashing width.
- Add seam allowance and usable fabric width.
- Choose outer sashing or cornerstones if your layout needs them.
- Press the calculate button.
- Review cut sizes, strip counts, yardage, and cost.
- Use CSV or PDF download for saving the result.
Quilt Sashing Planning Guide
Why Sashing Matters
Sashing gives quilt blocks room to breathe. It separates busy prints. It also adds structure to the final layout.
A narrow strip can create a neat grid. A wider strip can make each block feel framed. Good planning keeps the
quilt balanced before cutting starts.
Measure the Finished Design First
Start with the finished block size. Then choose the number of rows and columns. Add the sashing width between
blocks. If you want a framed look, include outer sashing too. The finished quilt size changes quickly when
more rows, columns, or borders are added.
Allow for Seams
Sashing is sewn on both long edges. That means the cut strip must include two seam allowances. For a two inch
finished sashing with quarter inch seams, cut each strip two and a half inches wide. This small step prevents
short strips and uneven rows.
Plan Strip Counts
Fabric is often cut across the width of fabric. This calculator estimates how many WOF strips are needed.
Long horizontal strips may need piecing. Press seams carefully. Keep joins away from block corners when possible.
This improves strength and appearance.
Use Cornerstones Carefully
Cornerstones add small squares where sashing strips meet. They can highlight colors from the blocks. They also
reduce the need for very long horizontal strips. However, they add more pieces. Count them before cutting.
Add Waste for Safety
Extra fabric helps cover trimming, squaring, directional prints, and cutting mistakes. Ten percent is common.
Use more for plaids, stripes, fussy cutting, or fabric with a strong pattern direction. Extra fabric is better
than running short near the end.
FAQs
1. What is quilt sashing?
Sashing is fabric placed between quilt blocks. It separates blocks, adds spacing, and can create a clean grid effect across the quilt top.
2. Should I include seam allowance?
Yes. Enter the finished sashing width and seam allowance. The calculator adds seam allowance to both sides for accurate cut width.
3. What does WOF mean?
WOF means width of fabric. It usually refers to strips cut from selvage to selvage across the usable fabric width.
4. What are cornerstones?
Cornerstones are small squares placed where horizontal and vertical sashing strips meet. They add detail and help divide long strips.
5. Should outer sashing be included?
Include outer sashing if you want fabric strips around the outside edge of the block layout before adding borders or binding.
6. Why add waste allowance?
Waste allowance covers trimming, squaring, directional fabric, shrinkage, and cutting mistakes. It makes the yardage estimate safer.
7. Can I use centimeters?
Yes. Select centimeters from the unit menu. The calculator converts internally and still provides yardage and meter estimates.
8. Is this result exact?
It is a strong planning estimate. Actual yardage may vary with fabric width, cutting style, print direction, and piecing choices.