Built and reviewed by David (MBA Finance) · Updated August 2026
Stop guessing at the fabric store. Whether you quilt, knit, make candles, pour soap, or work with epoxy resin, every tool here does the exact math for US measurements: yards, inches, ounces, and pounds.
Every tool in this hub is built around the measurements American crafters actually use, not metric conversions, not European fabric widths, not generic approximations. If your pattern says yards, your wax comes in pounds, and your jar is measured in fluid ounces, these calculators understand your workflow from the start.
Most craft calculators online handle one category, quilting sites cover fabric, candle sites cover wax, yarn shops estimate yardage. You end up with seven browser tabs open and still doing math in your head. This hub puts the six most calculation-heavy craft categories under one roof, with tools that go deeper than any single-category competitor: the candle wax calculator works backwards from jar volume to wax weight (something most fragrance-only calculators skip entirely), the quilt backing calculator handles pre-shrinkage and longarm overage in the same form, and the soap lye calculator includes batch cost and PDF recipe card export.
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Built for US Measurements
Yards, inches, fluid ounces, pounds, every output matches how American fabric stores, wax suppliers, and craft wholesalers sell their products.
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Deeper Than Competitors
Our candle calculator starts with your jar. Our quilt calculator accounts for pre-shrinkage. Our soap calculator includes cost per bar. Details matter when you’re buying $50 of supplies.
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PDF Export & Share
Every tool generates a branded PDF recipe card you can save, print, or share with your crafting group, no screenshots needed.
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Built-In Cost Calculators
Tools include optional cost inputs so you know your material cost per candle, per bar of soap, or per quilt before you commit to a production run or set a selling price.
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Mobile-Optimized
Calculate at the craft store, at your worktable, or while checking your order at a supplier. Every tool works perfectly on your phone or tablet.
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Free, No Sign-Up
No account required, no email gate, no trial expiration. These tools are free to use as many times as you need, on as many projects as you run.
Frequently Asked Questions About Craft Calculators
USCalculators.com offers 15 free craft calculators across six categories: quilting and sewing (quilt backing, quilt binding, quilt batting, fabric yardage converter, half square triangle calculator), yarn and fiber arts (yarn yardage estimator, knitting stitch calculator, crochet blanket size calculator), candle making (candle wax calculator, fragrance oil calculator), soap making (soap lye calculator for NaOH and KOH), resin and epoxy (epoxy resin volume calculator), and paper and decor (picture frame mat calculator, Cricut decal sizing calculator, Mod Podge coverage calculator). All tools are free, require no sign-up, and use US measurements, yards, inches, ounces, and pounds.
Start with the quilt backing calculator, it is the most commonly needed tool and covers the most complex fabric math. Enter your finished quilt top dimensions, select your backing fabric width (42 inch standard or 108 inch wide back), and the calculator tells you exactly how many yards to buy, including the number of panels and seam positions. If you are making multiple quilts or planning your fabric order for a full project, also use the quilt batting calculator and quilt binding calculator so you can order everything at once from the same supplier.
Yes. The candle wax calculator on this site is one of the only US tools that starts with your jar’s fluid ounce volume and works backwards to wax weight, accounting for the fill factor difference between soy wax (0.82 oz of wax per fl oz of container), paraffin (0.86), beeswax (0.90), and coconut wax blends. It also calculates fragrance oil amount for your chosen wax type and fragrance load percentage, recommends a starting wick size by container diameter and wax type, estimates burn time, and includes a cost-per-candle calculator if you enter your material prices.
Use the yarn yardage estimator. Enter your blanket’s target dimensions in inches, your yarn weight category (bulky, worsted, DK, etc.), and the stitch type. The calculator returns the total yardage needed and the number of standard skeins to purchase. Most yarn yardage calculators online only estimate based on weight, this tool cross-references yardage with typical skein yardage for each weight class to give you a skein count you can take directly to a yarn store or add to your online cart. Always add 10 to 15 percent to the estimated yardage to account for gauge variations and pattern complexity.
The soap making lye calculator computes the exact amount of sodium hydroxide (NaOH) needed for bar soap or potassium hydroxide (KOH) needed for liquid soap based on your oil blend and batch size. It uses saponification (SAP) values for each oil and fat to calculate the minimum lye needed to fully convert the oils to soap, then adjusts for your desired superfat percentage (typically 5 to 8 percent for a skin-safe bar). The tool includes water ratio recommendations, batch size scaling, and an optional cost-per-bar calculator. Never make soap without accurate lye calculations, too much lye creates a caustic bar that burns skin, and too little leaves excess unsaponified oil that causes rancidity.
Yes, every craft calculator in this hub is fully mobile-optimized. The two-column desktop layout collapses to a single-column layout on screens narrower than 768 pixels, making it easy to enter values and read results on a phone or tablet. This is especially useful for the candle wax and soap lye calculators, which you might reference while measuring materials at your workstation, and the quilt backing calculator, which you might use while shopping for fabric in a store.
Yes. Every tool in the crafts hub includes a PDF export button that appears after you calculate your results. The PDF is a branded recipe card that includes all your inputs, calculated outputs, and relevant guidance, making it easy to save your candle recipe, soap formula, or quilt cutting plan for future reference, or to share with a crafting partner or customer. PDF downloads require no sign-up and are always free.
The quilt backing calculator is the most-used quilting tool among American quilters, followed closely by the quilt binding calculator. The backing calculator is popular because backing fabric math is the trickiest part of quilt planning, you need to account for seam allowances when piecing 42-inch-wide fabric into panels, choose between horizontal and vertical piecing to minimize waste, add a longarm overage if you plan to have the quilt professionally quilted, and account for pre-washing shrinkage if you are using cotton. This calculator handles all of those variables in one form.
Craft Supply and Safety Guide: Yardage, Wax, Resin, and Lye
Running out of a dye lot halfway through a blanket, pouring candles that tunnel, or mixing a batch of resin that never cures are all problems that start before the project does, with a guess about quantity. This guide pulls together the measurements quilters, knitters, soap makers, candle makers, and resin artists use to plan supplies, plus the safety notes that matter when lye, hot wax, or epoxy is involved.
Quilt backing: add at least 4 inches on every side of the quilt top (8 inches to each dimension) for longarm quilting. Standard quilting cotton gives about 40 to 42 usable inches of width.
Binding: measure the perimeter, add 10 to 12 inches for corners and joining, and divide by the usable width of fabric to get the number of 2.5 inch strips.
Yarn: the Craft Yarn Council weight scale runs from 0 (lace) to 7 (jumbo). A worsted (4) adult throw usually needs 1,200 to 1,800 yards.
Candle wax: soy wax weighs less than water, so a container’s fluid ounce volume times about 0.86 gives the ounces of wax by weight. Fragrance load is usually 6 to 10 percent of the wax weight, within the wax maker’s stated maximum.
Soap: lye amounts come from each oil’s saponification value. Most recipes use a 5 percent superfat and a water to lye ratio between 2 : 1 and 2.5 : 1.
Epoxy: one US gallon is 231 cubic inches. Multiply length x width x depth in inches, divide by 231, and add 10 to 15 percent for spillover and the cup walls.
Worked examples
Lancaster, Pennsylvania queen quilt (90 by 108 inches). Backing needs 98 by 116 inches. Running the seams across, three panels of 42 inch fabric cover the 116 inch width, and each panel only needs to be 98 inches long, so 3 x 98 = 294 inches, about 8.2 yards. Buy 8.5 yards to allow for squaring the ends. Binding: the perimeter is 396 inches plus 12 is 408 inches, divided by 42 is 9.7, so cut 10 strips at 2.5 inches, which uses 25 inches of fabric (0.7 yards).
Asheville, North Carolina candle batch. Twenty 8 ounce jars hold 160 fluid ounces. At 0.86 that is about 138 ounces of soy wax, and an 8 percent fragrance load adds about 11 ounces of fragrance oil.
Salt Lake City, Utah river table. A pour of 60 by 8 inches at 1.5 inches deep is 720 cubic inches, or 3.1 gallons. With 12 percent extra, buy 3.5 gallons of deep pour resin, and pour in layers if the product’s maximum depth is less than 1.5 inches.
Safety notes that matter
Always add lye to water, never water to lye, and wear goggles and gloves. Sodium hydroxide causes severe burns.
Never leave melting wax unattended, and use a thermometer rather than guessing pour temperatures.
Work with epoxy in a ventilated room and keep uncured resin off skin.
Quick answers
How much yarn for a baby blanket? A worsted weight baby blanket about 30 by 36 inches typically uses 600 to 900 yards. Buy all skeins from the same dye lot.
How many half square triangles does a charm pack make? Using the two-at-a-time method, each pair of 5 inch squares makes two units that finish around 4 inches, so a 42 piece charm pack yields 42 units.