Quilt binding calculator — perimeter to strips and fabric
Enter quilt length and width, join extra, strip width, and fabric width to see perimeter, binding length, strip count, and fabric length to cut.
Units
Results
Perimeter: 280 in
Binding length: 290 in
Strips: 7
Fabric length: 17.5 in
Formula
perimeter=2×(L+W); binding=perimeter+extra; strips=ceil(binding÷fabricW); fabricLen=strips×stripW
Worked steps (check these)
- Perimeter = 2×(60+80) = 280 in
- Binding length = 280 + 10 = 290 in
- Strips = ceil(290 ÷ 42) = 7
- Fabric length = 7 × 2.5 = 17.5 in
Shopping estimates only — follow supplier safety notes and brand ratios.
Running out of binding mid-sew is painful. Perimeter plus join extra and strip math gives a shopping length before you cut.
How to use
- Measure finished quilt length and width
- Set join extra and strip width
- Enter usable fabric width
- Read strips and fabric length
Why this calculator
- Perimeter + extra
- Strip count from bolt width
- Imperial or metric
Good for
- Bed quilts
- Baby quilts
- Scrap binding plans
Tips
- Pattern matching may need more length
- Press seams open to reduce bulk
Examples
| Input | Output | Note |
|---|---|---|
| 60×80 in quilt, 10 in extra, 2.5 in strips, 42 in fabric | Binding length, strips, fabric length | Switch to cm for metric quilts |
Binding FAQ
- What is join extra?
- Allowance for seams and corners so the strip is not short when you join pieces.
- Bias vs straight grain?
- This tool sizes length only — cut bias or straight based on your pattern, not this math.
- Curtain fabric next?
- Window panels use Curtain fabric calculator.