Adding sashing to your quilt can completely transform the final design — but figuring out how much you need isn’t always straightforward.
This quilt sashing calculator helps you estimate the total length of sashing required based on your quilt size, so you can plan your cuts accurately and avoid running short mid-project.
How to Use the Quilt Sashing Calculator
- Enter the finished width of your quilt top (in inches)
- Enter the finished length of your quilt top
- Input the width of your sashing strips
- The calculator will estimate the total length of sashing required
What Is Quilt Sashing?
Sashing is the fabric strips placed between quilt blocks to:
- Separate individual blocks
- Add structure and alignment
- Highlight your quilt design
It can be simple or decorative, but either way — you need the right amount.
How Sashing Is Calculated
The calculator uses the quilt’s perimeter to estimate total sashing length:
- (Width × 2) + (Length × 2)
This gives you the total distance around the quilt layout where sashing is typically applied.
👉 This is a simplified estimate — actual needs may vary depending on your design.
Example: Calculating Quilt Sashing
Let’s say your quilt measures 60” x 72”.
Step 1: Calculate perimeter
(60 × 2) + (72 × 2) = 264 inches
👉 You will need approximately 264 inches of sashing
What This Means for Your Project
- You’ll cut enough strips to total at least 264 inches
- You may need multiple strips joined together
- Always round up slightly to allow for seam joins
Common Quilt Sashing Mistakes
These are easy to make — and frustrating to fix:
- ❌ Confusing sashing with borders (they are different)
- ❌ Forgetting seam allowances
- ❌ Not cutting enough length
- ❌ Ignoring layout changes that affect sashing
👉 Always plan your layout before cutting.
Tips for Better Quilt Sashing
- ✔ Use consistent strip widths for a clean look
- ✔ Press seams carefully to avoid bulk
- ✔ Cut extra length to allow for joining strips
- ✔ Consider color contrast to highlight blocks
When to Use This Calculator
This tool is especially helpful when:
- Designing your quilt layout
- Planning fabric cuts
- Working with sashing-heavy designs
- Estimating fabric before buying
FAQ
Does this include vertical and horizontal sashing?
This is a general estimate — complex layouts may require additional calculations.
Should I cut extra sashing?
Yes — always allow extra for seams and adjustments.
Is sashing the same as borders?
No — sashing goes between blocks, while borders go around the outside.
What width should sashing be?
Common widths range from 1.5” to 3”, depending on design.