# Quilting Fabric Calculator Backing, binding and batting yardage for a quilt, comparing both backing seam orientations to find the cheaper one. --- - **Canonical URL:** https://dothecalculation.com/calculators/quilting-fabric-calculator - **Category:** Hobbies & Leisure Utilities - **Publisher:** Do The Calculation (https://dothecalculation.com) - **Cost:** Free, no account or sign-up required - **Privacy:** Runs entirely in the browser; inputs are never sent to a server - **Methodology:** https://dothecalculation.com/methodology --- ## Work Out Backing, Binding and Batting for a Quilt Both backing orientations compared so you buy the smaller amount, plus binding strips, batting panels and the usable width left after the selvages come off. - Compares seaming the backing vertically and horizontally, then picks the cheaper - Binding strips from the perimeter, with an allowance for corners and joins - Shows what wide backing fabric would save against pieced yardage ## Quick Answer — How Much Fabric Does a Quilt Need? Three separate calculations, and only one of them is straightforward. **Binding** follows the perimeter. Total strip length is 2 × (width + length) plus an allowance for mitred corners and joining seams — 10 to 12 inches covers both. Divide by usable fabric width, round up for the strip count, and multiply by strip width for the yardage. **Backing** needs to be larger than the quilt on every side so it can be loaded on a frame and trimmed square. Four inches of overhang per side, so eight inches on each dimension, is standard for a longarm. **Batting** works the same way, usually with the same overhang. Note the width you can actually use. Quilting cotton is sold as 42 inches, but selvages take roughly an inch, so **41 inches** is what you cut from. For a **60 × 80 inch** throw: • **Binding** — 280 in perimeter plus 12 in allowance = 292 in needed, **8 strips** at 2½ in wide, **0.63 yd** • **Backing** — 68 × 88 in finished, **2 panels seamed vertically**, **4.89 yd** (buy 5) • **Batting** — 68 × 88 in from a 90-inch roll, **1 panel**, **2.44 yd** Seaming that backing the other way would need **3 panels and 5.67 yd** — three-quarters of a yard more for the same quilt. ## How to Use This Calculator: A 60 × 80 Throw Enter the finished quilt dimensions, your fabric width, and the selvage loss. Then the binding strip width — 2½ inches is the standard for double-fold binding, and 2¼ produces a slightly narrower finish. For the throw above, the perimeter is 2 × (60 + 80) = **280 inches**. Adding 12 inches for the four mitred corners and the diagonal joins between strips gives **292 inches** needed. At 41 usable inches per strip that is **7.12 strips**, rounded up to **8**. Eight strips at 2½ inches is 20 inches of fabric, or **0.56 yd** — round up to **⅝ yd** and you have a comfortable margin. The backing is where the calculator earns its place. The finished backing needs to be 68 × 88 inches. **Seamed vertically**, you cut panels the length of the quilt: 68 ÷ 41 rounds up to **2 panels**, each 88 inches long, so 176 inches or **4.89 yd**. **Seamed horizontally**, you cut panels the width: 88 ÷ 41 rounds up to **3 panels**, each 68 inches wide, so 204 inches or **5.67 yd**. Same quilt, same fabric, **0.78 yd difference** purely from which way the panels run. The calculator reports both and names the cheaper one, which on a busy fabric with a directional print may not be the one you choose — but you should at least know what the choice costs. The alternative is **wide backing fabric**, sold at 108 inches. At that width one panel covers the whole 88-inch length, needing just **2.44 yd** and no seam at all. It costs more per yard, but half the yardage and no seaming often makes it the better buy. The [sewing fabric yardage calculator](/calculators/sewing-fabric-yardage-calculator) handles the same width-and-layout arithmetic for garment cutting. ## A Second Example: A King Quilt Where the Answer Flips Take a **90 × 108 inch** king. The perimeter is 396 inches, so binding needs **408 inches** and **10 strips**, giving **0.69 yd** — round to ¾. The backing is 98 × 116 inches finished. **Seamed vertically**: 98 ÷ 41 rounds up to **3 panels** at 116 inches each, or **9.67 yd**. **Seamed horizontally**: 116 ÷ 41 also rounds up to **3 panels**, but each is only 98 inches wide, giving **8.17 yd**. The recommendation flips. On the throw, vertical seaming won by 0.78 yd; on the king, horizontal wins by **1.5 yd**. There is no rule of thumb that gets this right — it depends on how each dimension divides into the usable width, and the answer changes as the quilt changes. Wide backing is even more compelling here: 116 inches of 108-wide fabric is **3.22 yd** against 8.17 pieced. Five yards saved, no seam, and no matching a print across a join. A **40 × 40 inch baby quilt** shows the third case: 48 × 48 backing needs **2 panels either way**, so both orientations give **2.67 yd** and the calculator reports no saving. The 5 binding strips come to **0.35 yd**. Small quilts are the ones where the orientation genuinely does not matter, which is worth knowing so you do not spend time on it. ## The Details That Change the Answer **Usable width is not fabric width.** Selvages are woven differently and often printed with colour bars; they do not press flat and they shrink at a different rate, so they get trimmed. An inch of total loss is a reasonable default, but check your own fabric — some bolts lose closer to an inch and a half, and on a three-panel backing that can add a whole panel. **Prewashing changes everything.** Quilting cotton commonly shrinks 2% to 5%, which on a 108-inch backing length is two to five inches. If you prewash, do it before measuring rather than calculating on the bolt dimensions. If you do not, be aware the first wash will shrink the finished quilt. **Directional prints override the arithmetic.** If the backing has a print with an up and a down, the panel orientation is decided by the print rather than the yardage, and you buy whatever that requires. The same applies to a stripe you want running a particular way. The calculator tells you what each choice costs; it cannot tell you which one looks right. **Longarm quilters set their own overhang.** Four inches per side is common, but many require six or even eight, and a quilt returned with too little backing to load is an expensive mistake. Ask before buying rather than after. For the pieced top itself, block-level yardage depends entirely on the pattern and is a different calculation. The [knitting gauge calculator](/calculators/knitting-gauge-calculator) covers the equivalent problem in the other direction for a different craft, where the swatch decides the maths rather than the fabric width. ## Limitations This covers backing, binding and batting — the parts driven by the quilt's outer dimensions. It does not calculate the fabric for the pieced top, which depends on the block design, the number of blocks, the cutting layout and how efficiently pieces nest on the fabric. That is a pattern-specific calculation with no general formula. Binding is calculated as straight strips cut across the width of fabric, which is what the great majority of quilts use. Bias binding — cut at 45 degrees, necessary for curved edges and more durable on a quilt that will be heavily used — requires substantially more fabric, roughly 20% to 40% more depending on how the bias strips are laid out, and is not modelled here. The backing calculation assumes rectangular panels joined with straight seams and does not account for matching a print across a join, which can cost several extra inches per seam. It also assumes the seam allowance is absorbed within the overhang, which is true at four inches of overhang and gets tight below that. Finally, every figure is a minimum. Fabric is cut inaccurately at the shop, bolts run narrow, cutting errors happen, and a quarter-yard of margin has rescued far more projects than it has wasted. The rounded yardage figures here already round up to the nearest eighth; adding another quarter-yard on anything you cannot easily rebuy is sensible rather than wasteful. ## Related Calculators The [Sewing Fabric Yardage Calculator](/calculators/sewing-fabric-yardage-calculator) handles the same width-and-layout arithmetic for garment cutting, where the pattern pieces rather than the panels drive the answer. The [Knitting Gauge Calculator](/calculators/knitting-gauge-calculator) covers the equivalent sizing problem in knitting, where a swatch replaces the fabric width. The [Yarn Yardage & Project Estimator](/calculators/yarn-yardage-estimator) sizes a yarn purchase the way this page sizes a fabric one, and the [Crochet Blanket Dimensions Calculator](/calculators/crochet-blanket-dimensions-calculator) works from finished dimensions back to stitch counts for the closest equivalent project. ## Frequently asked questions ### How much backing fabric does a quilt need? It depends on which way the panels run. A 60 × 80 throw needs 4.89 yd seamed vertically or 5.67 yd horizontally — a difference of three-quarters of a yard. A 90 × 108 king flips the other way: 9.67 yd vertically against 8.17 horizontally. There is no rule of thumb; it depends on how each dimension divides into the usable width. ### How many binding strips do I need? Take the perimeter, add 10 to 12 inches for mitred corners and joining seams, and divide by usable fabric width. A 60 × 80 quilt has a 280-inch perimeter, needs 292 inches of binding, and takes 8 strips from 41-inch usable width — about ⅝ yard at 2½-inch strips. ### What is usable fabric width? The width you can actually cut from, after the selvages come off. Quilting cotton is sold as 42 inches but the selvages take roughly an inch, leaving 41. Some bolts lose closer to an inch and a half, which on a three-panel backing can add a whole extra panel. ### How much backing overhang do I need? Four inches per side — eight inches on each dimension — is the common standard, so a 60 × 80 quilt needs a 68 × 88 backing. Many longarm quilters require six or eight inches per side, so ask before buying rather than after. ### Is wide backing fabric worth it? Usually. At 108 inches, one panel covers most quilt lengths with no seam at all. The 60 × 80 throw needs 2.44 yd of wide backing against 4.89 yd pieced; the king needs 3.22 yd against 8.17. It costs more per yard, but half the yardage and no seaming often wins outright. ### Does this include fabric for the quilt top? No. The top depends on the block design, the number of blocks and the cutting layout, which is a pattern-specific calculation with no general formula. This page covers backing, binding and batting — the parts driven by the finished dimensions. ### Should I prewash before calculating? If you intend to prewash, do it before measuring. Quilting cotton commonly shrinks 2% to 5%, which on a 108-inch backing is two to five inches — enough to leave you short. If you do not prewash, expect the finished quilt to shrink on its first wash instead. ### What about bias binding? It needs substantially more fabric, roughly 20% to 40% more depending on the layout, and is not modelled here. Bias binding is necessary for curved edges and more durable on a quilt that will see heavy use, so it is worth the extra on some projects. ## Related concepts - **Width of Fabric (WOF)** — The full bolt width, conventionally 42 inches for quilting cotton. What you can cut from is less: selvages take roughly an inch, leaving about 41 usable inches, and that figure drives every panel and strip count. - **Backing Overhang** — The extra fabric beyond the quilt top on every side, so the quilt can be loaded on a frame and trimmed square. Four inches per side is common; many longarm quilters require six or eight. - **Double-Fold Binding** — Binding cut at 2½ inches, folded in half lengthwise and stitched to both faces of the quilt edge. It is the standard finish and the basis of the strip calculation here. ## Related guides - [How to Use Do The Calculation Calculators: A Practical Step-by-Step Guide](https://dothecalculation.com/blog/site-guides/how-to-use-calculators) — Learn the fastest reliable workflow for using Do The Calculation calculators, reading results, checking formulas, and using save, print, share, and export actions correctly. - [Understanding Calculator Formulas: How DTC Turns Inputs into Results](https://dothecalculation.com/blog/site-guides/understanding-calculator-formulas) — Understand how Do The Calculation formulas are presented, what the explanation blocks mean, and how to verify calculator logic before using a result in a real decision. ## Related calculators - [Home Brewing Water Chemistry Calculator](https://dothecalculation.com/calculators/home-brewing-water-chemistry-calculator) — Turn source water, RO dilution and salt additions into a full ion profile, sulfate-chloride ratio and residual alkalinity. - [Binary, Hexadecimal, & ASCII Multi-Base Converter](https://dothecalculation.com/calculators/binary-hex-ascii-calculator) — Convert integers and strings between binary, hexadecimal, ASCII, and decimal formats instantly with this free online conversion tool. - [Blood Donation Eligibility & Regeneration Tracker](https://dothecalculation.com/calculators/blood-donation-interval-calculator) — Track blood donation eligibility dates, countdowns, and iron and plasma regeneration phases instantly with this free tracker tool. - [Estate & Gift Tax Calculator](https://dothecalculation.com/calculators/estate-tax-planning-calculator) — Estimate federal and state estate and gift tax liabilities, applicable exemptions, and net inheritance passed on to heirs. - [Solar Noon, Sunset, & Daylight Duration Calculator](https://dothecalculation.com/calculators/solar-noon-daylight-calculator) — Calculate NOAA solar noon, sunrise, sunset, and total daylight duration based on latitude and longitude coordinates instantly. - [Word Counter Calculator](https://dothecalculation.com/calculators/word-counter-calculator) — Count words, characters, sentences, and paragraphs in real-time, estimate reading times, and analyze word density/readability. --- _Every strip count, yardage and inch figure on this page was produced by running this calculator with the stated inputs rather than estimated. It covers backing, binding and batting only — the pieced top depends on the block design and cutting layout, which has no general formula. Binding is calculated as straight strips cut across the width of fabric; bias binding needs roughly 20% to 40% more and is not modelled. The backing figures assume rectangular panels joined with straight seams and no print matching across joins. Every result is a minimum, and prewashing shrinkage of 2% to 5% should be accounted for before measuring rather than after._ --- _Source: [Do The Calculation](https://dothecalculation.com/calculators/quilting-fabric-calculator). Quote freely with attribution and a link to this page._