How to Use Quilt Calculator
The Quilt Calculator sizes any quilt project in seconds.
- Pick a Bed Size — Twin, full, queen, king, or custom. Selecting a preset auto-fills mattress dimensions.
- Set the Season — Summer, all-season, or winter. The calculator adjusts the drop accordingly.
- Review Quilt Dimensions — The Quilt Calculator computes quilt width, length, perimeter, and area.
- Read Yardage and Binding — Total fabric yardage (assuming 110 cm bolt) and binding length.
Formula & Theory — Quilt Calculator
quilt_width = mattress_width + 2 × drop
quilt_length = mattress_length + drop_top + drop_bottom
area = quilt_width × quilt_length
perimeter = 2 × (quilt_width + quilt_length)
binding = perimeter + 30 cm (corner + joining allowance)
fabric_yards = ceil(area × 1.05 ÷ bolt_width) (5% pattern allowance)| Symbol | Meaning |
|---|---|
| mattress_* | Mattress dimensions |
| drop | Side drape per side |
| binding | Binding strip total length |
Drop Reference
Summer drop = 15 cm (top of mattress)
All-season drop = 30 cm (mid-mattress)
Winter drop = 45 cm (down to bed frame)Use Cases for Quilt Calculator
- Hand or Machine Quilting — Plan top, batting, and backing yardage at once.
- Gift Quilts — Resize to baby quilts, throw, or wedding quilts.
- Fabric Shopping — Decide between 110 cm and 280 cm wide backings.
- Pattern Resizing — Convert a published twin pattern to queen or king.
- Estimation for Sale — Quote material cost when selling quilts on commission.
The Quilt Calculator brings clarity to one of the most material-intensive crafts.