TRIMCRAFT

Fabric Yardage Calculator

Enter the yardage a pattern lists at its reference width, and get the equivalent yardage for the fabric width you’re actually buying — plus allowances for nap and print-repeat matching.

The yardage printed on the envelope or instructions, for the reference width below.
Almost always 45in for home-sewing patterns; check the yardage chart.
Common bolt widths: 45, 54, 60.
Velvet, corduroy, and one-directional prints need every piece laid the same way — about 20% more fabric.
The distance between repeats of the design, if you need to match it across seams.
How many large pieces (front, back, sleeves…) need the repeat matched.

Fabric to buy

Width-adjusted yardage
2.50 yd
Nap/one-way extra
0.00 yd
Repeat-match extra
0.00 yd
Buy this much
2.5 yd

How the conversion works

Pattern envelopes print a separate yardage figure for each common fabric width because the total area of fabric a garment consumes is roughly fixed — only how that area is arranged changes. Converting between widths is a straightforward ratio: multiply the stated yardage by the reference width and divide by your fabric’s actual width. Buy narrower than the chart’s reference and you need more running yards; buy wider and you need fewer.

Two real-world wrinkles get added on top. Napped or one-directional fabric forces every piece to face the same way, which sacrifices the cutting efficiency you’d get from flipping pieces to interlock them — about 20% more fabric covers it. Matching a print or plaid repeat across a seam means sliding pieces down to the next repeat rather than cutting them wherever they land, which costs roughly one repeat-length of extra fabric per major piece involved.

Frequently Asked Questions

Why does yardage change with fabric width?

A pattern's cut pieces cover roughly the same total area no matter which bolt you buy from. Wider fabric lets those same pieces fit across fewer running yards, so the length you need scales down as the width goes up — which is exactly why every commercial pattern's yardage chart lists a different number for 45in, 54in, and 60in fabric.

What counts as a 'napped' or 'one-way' fabric?

Nap refers to fabrics with a directional pile, like velvet or corduroy, that look and feel different depending which way the light or grain runs. One-way also covers directional prints, animals, or a large motif that should face the same way on every piece. Either one means every pattern piece must be laid out pointing the same direction, which uses noticeably more fabric than a random layout — this tool adds roughly 20% for that.

How much extra do I need for a print repeat?

Matching a repeating print or plaid across a seam (say, where a sleeve meets a bodice) means you can't just butt the pieces up wherever they fall on the fabric — you have to slide each piece down to the next repeat. As a working rule of thumb, budget roughly one extra repeat-length for every major cut piece beyond the first; large repeats on multi-piece garments can add a surprising amount of fabric.

Is this exact enough to buy fabric with?

Treat the result as a well-informed estimate, not a guarantee. Real layouts depend on your specific pattern pieces, the fabric's exact usable width after selvages, and how efficiently they nest — buying a little extra (many sewists round up to the next quarter or half yard beyond this tool's answer) is cheap insurance against a too-tight cut.

Educational tool only. Results are estimates based on standard sewing conventions; buy a little extra and confirm against your specific pattern layout before cutting.