Fabric From Pattern Pieces
Calculator
Results
- Area of one piece (cm²)
- 1,800
- Total fabric area (cm²)
- 14,400
- Total area including waste (cm²)
- 16,560
- Fabric length needed (cm)
- 110.4
- Fabric length needed (m)
- 1.104
Craft results
| Area of one piece (cm²) | 1,800 |
| Total fabric area (cm²) | 14,400 |
| Total area including waste (cm²) | 16,560 |
| Fabric length needed (cm) | 110.4 |
| Fabric length needed (m) | 1.104 |
formula-map diagram
- Area of one piece (cm²)
- 1,800
- Total fabric area (cm²)
- 14,400
- Total area including waste (cm²)
- 16,560
- Fabric length needed (cm)
- 110.4
- Fabric length needed (m)
- 1.104
Formula breakdown
Formula
L = (w × l × n × (1 + waste)) ÷ W= 1800
Note
Simplified model: these are standard craft estimates based on rectangular layouts, quoted gauge and nominal densities. Real fabric nap, directional prints, shrinkage, pattern matching, yarn lots and supplier SAP values vary, so always make a swatch or test piece and buy a little extra.
More in Crafts and sewing
See all →Frequently asked questions
How is this different from just using the pattern envelope's yardage chart?+
The envelope chart is a rough estimate for standard sizes; calculating from actual pattern pieces accounts for your specific piece dimensions, grainline requirements, and fabric width, which matters most for custom or resized patterns.
What is 'nesting' and why does it matter here?+
Nesting is how tightly pattern pieces can be arranged on the fabric without overlapping and while respecting grainlines. Efficient nesting reduces waste, but this calculator assumes a reasonably efficient single-direction layout rather than an expert tetris-style cut.
Do I need to account for seam allowances separately?+
Yes, if your pattern pieces are drafted without seam allowance, add it to each piece's dimensions before entering them, or use the seam allowance total calculator first. Skipping this is the most common reason people run short on fabric.
Why does the fabric width I choose change the total so much?+
Pieces are placed across the width, so a width just barely too narrow to fit two pieces side by side forces them into separate rows, roughly doubling the length needed for that piece. Small width differences can therefore cause large jumps in total yardage.
How much extra should I buy beyond the calculated total?+
A buffer of 10-15% is standard to cover cutting mistakes, pattern matching, and layout inefficiency versus the calculator's idealized packing. For expensive or hard-to-rematch fabric, buy the higher end of that range.