Browser-local quilt planning
Quilt binding calculator
Plan straight-grain width-of-fabric binding strips joined with diagonal seams. See the strip count, modeled joined length, remainder, and exact unrounded fabric length.
Your measurements stay in this browser. No account or upload is needed.
Calculator
Plan your quilt binding
Use one unit throughout. Changing the unit label does not convert values.
Measurements
Result
Enter measurements to plan binding
- Quilt perimeter
- Required binding
- WOF strip count
- Strip cut dimensions
- Modeled joined length
- Remaining modeled length
- Unrounded fabric length
- Arithmetic equivalent
Not a purchase quantity. The fabric length and yards/metres figure are unrounded arithmetic only; neither is rounded to retailer cut increments.
How the model works
Usable width and diagonal joins
Usable fabric width is the cross-grain width available for a strip after you leave out the selvages. A diagonal join consumes length at both strip ends; this model conservatively treats each strip as contributing usable fabric width minus one strip cut width.
It divides the perimeter plus your chosen extra binding by that contribution, rounds the strip count up, then multiplies the count by strip cut width for the exact unrounded fabric length.
Worked examples
Recomputed strip plans
60 × 80 in quilt
Perimeter 280 in plus 12 in extra gives 292 in required. With 42 in usable width and 2.5 in strips, each contributes 39.5 in. Eight strips model 316 in joined, leave 24 in, and require 20 in of fabric—arithmetically 0.555555555556 yards.
150 × 200 cm quilt
Perimeter 700 cm plus 30 cm extra gives 730 cm required. With 110 cm usable width and 6.5 cm strips, each contributes 103.5 cm. Eight strips model 828 cm joined, leave 98 cm, and require 52 cm of fabric—arithmetically 0.52 metres.
Related quilt planning
Planning the quilt back too?
The quilt backing calculator compares equal-panel backing layouts. Use it separately when you need a backing cut plan; neither calculator changes the other’s result.