Fabric Calculator

Fabric is sold off a bolt of fixed width, so the yardage depends on how many pieces fit side by side across that width rather than on their total area. Enter the size of one piece, how many you need, the bolt width, the seam allowance and any shrinkage, and this lays them out, tries them turned sideways as well unless the fabric has a nap, and rounds the answer up to the next eighth of a yard. A second mode converts a pattern's yardage from the width it assumes to the width you actually found. Pieces are treated as rectangles, so a shaped pattern piece should be measured at its widest and longest, and pattern repeats, bias cutting and interfacing are not counted.

Calculator Type
Measurements and Price In
This moves every measurement you type and the price, and the answers come back in it. It does not touch the fabric width list below, because a bolt width is a product rather than a number: pick the width you actually found, in whichever unit the shop quotes it.

Give the finished size of one piece and how many you need, and this lays them out across the bolt.

Across the bolt, in inches. For a shaped pattern piece, measure the widest point.
Down the bolt, along the grain, in inches.
Both markets are listed with the widths they are really sold in. A metric shop stocks 110 cm and 150 cm rather than a converted 45 or 60 inch, which is why this list is not a conversion of the other half.
Added to all four sides, in inches. Garment patterns usually print 5/8 in, so type 0.625; quilting uses 1/4 in, so type 0.25. Enter 0 if your measurements already include it. Left blank it is half an inch.
The tight woven edge on both sides that cannot be used, in inches. Left blank it is one inch.
Extra length so the piece still fits after prewashing. Cotton and linen commonly lose a few per cent.
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Measurements and Price In
This moves every measurement you type and the price, and the answers come back in it. It does not touch the fabric width list below, because a bolt width is a product rather than a number: pick the width you actually found, in whichever unit the shop quotes it.

A pattern quotes yardage for one bolt width. This converts it to the width you actually found.

Both markets are listed at the widths they are really sold in, so a metric pattern written for 110 cm can be converted straight to 150 cm without going through inches.
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