Yarn Yardage Calculator
Calculate how much yarn you need for a project from gauge, dimensions, and stitch pattern. Enter values for instant results with step-by-step formulas.
Reviewed by Daniel Agrici, Founder & Lead Developer
Formula
Yardage = Base × Size Multiplier × Yarn Weight Multiplier × Gauge Adjustment
Each project type has a base yardage for worsted weight in medium adult size. This is adjusted by size (XS=0.5x to 2XL=1.6x), yarn weight (lace uses less, bulky uses more), and your personal gauge. Add 10% buffer for swatches and mistakes.
Worked Examples
Example 1: Adult Scarf in Worsted
Problem:How much worsted weight yarn do I need for a medium adult scarf?
Solution:Base yardage for scarf: 350 yards\nSize multiplier (Medium): × 1.0\nYarn weight multiplier (Worsted): × 1.0\nTotal: 350 yards\nSkeins at 220 yd/skein: ceil(350/220) = 2 skeins\nWith 10% buffer: 385 yards → 2 skeins\nAt $8/skein: $16 total
Result:350 yards needed | 2 skeins | ~$16
Example 2: Large Blanket in Bulky
Problem:How much bulky yarn for a large throw blanket?
Solution:Base yardage for blanket: 2,500 yards\nSize multiplier (Large): × 1.2\nYarn weight multiplier (Bulky): × 1.3\nTotal: 2,500 × 1.2 × 1.3 = 3,900 yards\nSkeins at 136 yd/skein: ceil(3900/136) = 29 skeins\nWith 10% buffer: 4,290 yards → 32 skeins\nAt $8/skein: $256 total
Result:3,900 yards needed | 29 skeins | ~$232
Frequently Asked Questions
How do I estimate yarn yardage for a project?
Yarn yardage depends on four main factors: project type (a blanket uses 5-10x more than a hat), size (baby items need 40-50% less than adult), yarn weight (bulky yarn requires more yardage than fingering weight due to thickness), and your personal gauge (tighter knitters use more yarn). Yarn Yardage Calculator estimates based on average requirements. Always buy 10% extra to account for gauge swatches, mistakes, and variations. Most yarn stores accept returns of unopened skeins from the same dye lot.
What does yarn weight mean?
Yarn weight refers to the thickness of the yarn strand, not how much it weighs on a scale. The Craft Yarn Council standardizes weights from 0 (Lace) to 7 (Jumbo). Common weights: Fingering (1) — socks and lightweight garments. Sport (2) — baby items, light sweaters. DK (3) — versatile, slightly lighter than worsted. Worsted (4) — the most popular weight, great for sweaters, scarves, blankets. Bulky (5) — quick projects, winter accessories. Super Bulky (6) — very fast projects, chunky blankets. The weight determines needle/hook size, gauge, and total yardage needed.
What is gauge and why does it matter for yarn estimation?
Gauge (or tension) is the number of stitches per 4 inches (10 cm) in your knitting or crochet. Everyone knits differently — some tighter, some looser. If your gauge is tighter than the pattern calls for (more stitches per inch), you'll use more yarn. If looser (fewer stitches), you'll use less. A difference of just 1 stitch per inch can mean needing 10-15% more or less yarn. Always knit a gauge swatch before starting a project, and adjust needle size to match the pattern's gauge.
Should I buy extra yarn?
Yes, always buy 10-15% more yarn than your estimate. Reasons: gauge swatches consume yarn, mistakes require frogging and re-knitting (which shortens yarn), joining new skeins wastes a few yards at each join, and patterns often underestimate. Most importantly, buy all your yarn from the same dye lot — skeins from different dye lots can have subtle color differences that become visible in the finished item. It's much better to have leftover yarn (great for small accessories, patches, or donations) than to run short.
References
Reviewed by Daniel Agrici, Founder & Lead Developer · Editorial policy