Quilt Sizes and Yardage: How Much Fabric, Backing, Batting and Binding You Actually Need

Most quilt size charts give you one number, the finished size, and leave you to work out the rest. The rest is the part that costs money. Here is the whole picture in one place: what each quilt commonly finishes at, how much backing and batting it takes, how much binding it eats, and the one size where you are forced to buy wider batting.

Finished sizes, and the batting width each one forces

These are common finished sizes rather than rules — your block math usually decides the final number. Backing and batting figures below assume 4" of extra fabric on all four sides, which is the standard allowance for domestic machine quilting and for most longarm work. (Longarm requirements do vary by quilter; if you are sending a top out, ask before you cut.)

That last column is the one people get caught by. Batting comes off a roll, so only one of your two dimensions has to fit inside the roll's width — the other comes off the length, which is effectively unlimited. A twin needs 78" × 98", and because 78" fits inside 96", you simply pull 98" off a standard roll. A queen needs 98" × 116", and both numbers are over 96". There is no clever way to orient it.

Queen is exactly where a 96" roll stops working, which is the practical argument behind our 96" vs 120" batting guide.

If you are buying by the piece instead of the roll, pre-packaged batting is sold in these bed sizes already cut. Buying off the roll gets cheaper the moment you are making more than two or three quilts a year, and the fiber decision — cotton, 80/20 or bamboo — is covered in our batting comparison.

Backing: piece it, or buy it wide

Standard quilting cotton is 42–44" wide, and after you trim selvages you can count on about 42" of usable width. Almost every backing above throw size therefore needs seaming — usually two or three panels. Wide backing fabric (typically 108") skips that entirely. Here is what each route costs you in yardage:

Two things worth noticing. First, the yardage gap widens fast: at crib size, wide backing saves you under a yard; at twin it saves nearly three; at queen it saves five. Second, a king backing is 118" wide, which is wider than 108" wide backing — even the wide stuff has to be pieced for a king. You just get to do it with one seam instead of two.

When you do piece a backing, run the seam across the quilt rather than down the middle of a bed, press it open to spread the bulk, and trim the selvages off before you sew. Selvage is more tightly woven than the rest of the yardage and it will pull that seam tight later.

Binding, and why you should buy by the strip count

Binding yardage confuses people because it is calculated from the perimeter, not the area. The arithmetic is short:

1. Perimeter = (width + length) × 2
2. Add 15" for the four mitered corners and the joining seams
3. Divide by 40 (usable strip length after trimming selvages) and round up — that is your strip count
4. Strips × strip width ÷ 36 = yards

Round up on the fabric, not just on the strips. A ¾ yard cut gives you 27" of length, which is ten 2½" strips with a little to spare — and "a little to spare" is what saves a second trip when one strip goes wrong at a corner. Our binding guide covers strip width, joining and mitering in full.

When the chart doesn't fit the bed

Published quilt charts are averages, and they have been quietly going stale because mattresses got deeper. A 1990s mattress was 8–10" thick. A modern pillow-top can be 14–18", and the foundation underneath adds more. A chart written against a 9" mattress hands you a quilt that stops short of the rail on a bed that is 16" deep.

So measure the bed and derive the size. Two lines of arithmetic:

• Finished width = mattress width + (2 × drop)
• Finished length = mattress length + drop + pillow allowance

"Drop" is how far down the side you want the quilt to hang, measured from the top edge of the mattress. Roughly: 10–12" is a coverlet that sits above a bed skirt, 15" reaches the rail on most beds, and 20–22" reaches the floor. "Pillow allowance" is 0 if the pillows sit on top of the quilt, or 10–14" if you want to tuck the quilt over them.

Worked example: a queen mattress with a 15" drop and no pillow tuck comes out at 60 + 30 = 90" wide and 80 + 15 = 95" long. That is 13" shorter than the 108" "queen quilt" in every chart — because the chart assumes a pillow tuck. If your pillows go on top, you can save most of a yard of backing by building the quilt you actually want.

Build the number into your blocks, not onto the end

Once you have a target size, resist the urge to hit it exactly by widening a border. Divide the target by your block size and see what lands close. A 90" × 96" target at 12" blocks is 7½ × 8 blocks — so either move to a 10" block, or accept 7 × 8 blocks at 12" and add a 3" border to reach 90". Working outward from the block gives you even proportions; working backward from the target tends to give you a quilt with one oddly fat border.

One caution that catches everyone once: a quilt shrinks as it is quilted. Dense quilting draws the top in more than sparse quilting, and a heavily quilted queen can lose 2–4" across. Measure the top before quilting, and measure again before cutting binding.

Quick answers

Do I need extra backing for longarm quilting?

Usually, and often more than 4" a side — a longarm needs fabric to clamp and to load onto the leaders. Ask your quilter for their number before you cut. Some ask for 4", some for 6", and across a queen that difference is close to a yard.

Can I use two different fabrics in one backing?

Yes, and on large quilts it is often the sensible move. A pieced backing from two coordinating yardages costs less than eight yards of one print and reads as deliberate rather than thrifty.

How much does prewashing change these numbers?

Quilting cotton typically loses 2–3% in the first wash, roughly 1" per yard of length, so buy the extra if you prewash. Whether you should prewash at all is a longer conversation — see our straight answer on prewashing.

Does any of this apply to precuts?

Precut bundles are sold by piece count rather than yardage, so a pattern written for them tells you how many packs to buy. Our precut guide explains what each bundle actually contains, and how to read a quilt pattern before you cut covers working through a requirements list properly.

Building a shopping list? Start with fabric and precuts, add batting by the roll or by the package, and if this is your first quilt, Your First Quilt takes it from here. Once the top is done, basting is the next decision.