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Fabric yardage calculator

Fabric is bought by length at a fixed width, so the question is how many pieces fit across the bolt.

%
Fabric to buy
1.76m
= Exact Fabric quantity
In yards
1.92
Pieces across the width
2
Rows needed
2
Cutting efficiency
71.4 %
Area actually used
1.760
Area purchased
2.464
Show the working
  1. Piece length = 80
  2. Piece width = 55
  3. Number of pieces = 4
  4. Fabric width = 140
  5. Pattern repeat = 0
  6. Waste allowance = 10
  7. Pieces across the width = max(floor(140 / 55), 1) = 2
  8. Rows needed = ceil(4 / 2) = 2
  9. row_length = 0 > 0 ? ceil(80 / 0) * 0 : 80 = 80
  10. length_cm = 2 * 80 * (1 + 10/100) = 176
  11. Fabric to buy = 176 / 100 = 1.76
  12. In yards = 1.76 * 1.0936132983377078 = 1.924 76
  13. Area actually used = 4 * 80 * 55 / 10000 = 1.76
  14. Area purchased = 176 * 140 / 10000 = 2.464
  15. Cutting efficiency = 2.464 > 0 ? 1.76/2.464*100 : 0 = 71.4286

Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.

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    The formula

    • pieces across = floor(bolt width / piece width)
    • length = ceil(pieces / across) x piece length x (1 + waste)

    A directional print or a nap means every piece must run the same way, which usually costs 15 to 20% more fabric.

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