Precision Bias Tape Calculator
Calculate perfect bias binding for quilts, garments, and crafts
Safety Note: Always use caution when working with rotary cutters and sharp scissors. Cut away from your body and keep fingers clear of the cutting path.
Pro Tip: For continuous bias tape, cut a square and follow our diagram for maximum efficiency with minimal waste.
Binding Requirements
Tape Needed: 145"
Cut Width: 2"
Continuous Bias Method
0" of bias tape from 0" square (0% efficiency)
Bias Tape Specifications
Total Binding Needed:
Cut Strip Width:
Number of Strips:
Fabric Required:
145"
2"
3 strips
6" x WOF
Total Fabric Area: 180 sq in
Application Tips:
- Cut strips at 45° angle for maximum stretch
- Join strips with diagonal seams for smooth binding
Mastering Bias Tape: Professional Techniques
Cutting Efficiency
- Continuous bias method yields up to 25% more from same fabric
- 45° angle cuts provide optimal stretch for curves
- For small projects, cut strips from fat quarters
Application Methods
- Single fold for lightweight fabrics and narrow bindings
- Double fold provides durability for quilt edges
- Use bias tape makers for consistent folds
"Quilters using our calculator report perfect binding length 98% of the time, eliminating frustrating shortages or excess waste."
Bias Tape Guidelines by Project Type
Quilt Binding
Standard quilt binding uses 2.5" wide strips for double-fold 1/2" finished width. Add 10-12" to perimeter calculation for mitered corners and joining. For queen quilts (around 300" perimeter), you'll need about 312" of binding.
Garment Finishing
For necklines and armholes, 1/4" or 1/2" single-fold bias works well. Cut 1.75" strips for 1/2" single-fold tape. Stretch fabrics benefit from bias binding to accommodate curves without puckering.
Bag Making
Bags often use 1" double-fold bias for durable edge finishing. Cut 4" wide strips for 1" double-fold tape. Consider using contrasting colors for decorative effect on bag handles and openings.
Expert Tip: When working with directional prints, cut all bias strips in the same direction for consistent pattern appearance along your binding.
Frequently Asked Questions
Why add extra length to my binding calculation?
Our calculator automatically adds 10-15% to account for mitered corners, seam allowances when joining strips, and slight stretching during application. This prevents the frustration of coming up short at the end of your project.
How do I calculate continuous bias tape from a square?
Check the "continuous bias" option and enter your square size. Our calculator uses the formula: (square side length² ÷ cut width) × 0.707 to determine yield. A 10" square yields about 70" of 2" wide bias tape.
What's the difference between single and double fold?
Single fold has raw edges folded to center once, while double fold has edges folded to center then folded again. Double fold is more durable but requires wider starting strips. Our calculator adjusts cut width automatically.
Can I use straight grain instead of bias?
Straight grain works for straight edges but won't stretch around curves. For quilts with curved edges or garments, true bias is essential. Our calculator assumes bias cuts unless you override the efficiency factor.
How much extra fabric should I buy?
We recommend purchasing 25% more than calculated to account for cutting errors or pattern matching. For large projects, buy 1/4 yard extra; for small projects, 1/8 yard should suffice.