Yarn
Skein Calculator
Turn a total yardage into the number of skeins or balls to buy, with a safety buffer, the total weight, and how much will be left over.
Yarn Skein & Ball Calculator
Common Skein / Ball Put-Ups (Click to load):
1. Yardage NeededPattern Goal
yds
2. Skein YardageBall Band
yds
3. Skein WeightGrams
g
4. Safety Buffer+10%
10% recommended for swatch & yarn tails
Purchase Order Blueprint (10 Skeins)
Total Skeins to Purchase
10skeins
Rounded up from 9.69 exact balls
Total Yardage (w/ 10% Buffer)
2,035yds
1,850 yds base + 185 yds buffer
Total Weight of Project
1,000grams
~1.00 kg (35.3 oz)
Leftover Yarn in Final Skein
~65yds
Surplus safety margin remaining
Dye Lot Guarantee: Buying all 10 skeins simultaneously ensures they carry matching dye lot numbers. Running out of yarn 90% into a blanket and buying a ball weeks later often results in an obvious line of discoloration in the final piece.
How to use the skein calculator
- Row 1Enter the total yardage your pattern calls for, or an estimate from the yarn calculator.
- Row 2Enter the yards per skein and grams per skein from your yarn label.
- Row 3Choose a buffer percentage (10% is a sensible default).
- Row 4Read how many skeins to buy, their total weight, and the leftover yardage.
Why you should buy by length, not by weight
Yarn is sold by weight, but projects use length. Two 100 g balls can hold very different amounts. A fine, light yarn might have 400 yards in 100 g, while a dense chunky one might have 100. That's why patterns list total yardage, and why you should always divide by your yarn's yards per skein, not just buy the same number of balls the pattern used.
Worked example
A pattern needs 1,850 yards. Your yarn has 210 yards per 100 g skein, and you want a 10% buffer.
- 1.With the buffer: 1,850 × 1.10 = 2,035 yards
- 2.Skeins: 2,035 ÷ 210 = 9.7, so buy 10 skeins
- 3.Total weight: 10 × 100 g = 1,000 g
- 4.Leftover: 10 × 210 − 2,035 = 65 yards
Substituting yarn? Convert the pattern's yarn to total yards first. If it calls for 6 balls of 220 yards, that's 1,320 yards. Then enter 1,320 here with your new yarn's yards per skein.
Choosing a buffer
A buffer covers your swatch, tension differences, and the border or seams. Some rough guidance:
- 5% if you're following a pattern exactly with the same yarn and you match the gauge.
- 10% for most projects. It's the default for a reason.
- 15–20% if you crochet loosely, you're substituting yarn, or the yarn could be hard to find later.
Unused balls can often be returned or kept for matching accessories. Running out and finding the dye lot discontinued is much worse.
The formula
Total with buffer = pattern yardage × (1 + buffer). Skeins = total ÷ yards per skein, rounded up. Weight = skeins × grams per skein. Leftover = skeins × yards per skein − total with buffer.
Tips
- Check the dye lot number on every skein before you leave the shop.
- Write the yarn name, color and dye lot in your project notes.
- For multi-color projects, calculate each color separately.
- Weigh partial balls from your stash: grams × (label yards ÷ label grams) gives the yards left.
Skein Calculator FAQ
Multiply the total yardage by 1 plus your buffer (for example 1.10 for 10%), divide by the yards per skein, and round up.
In-depth guides
Yarn8 min readHow Much Yarn for a Crochet Blanket? Chart and 3 Ways to Estimate
A full yardage chart for every blanket size, what changes the numbers, and three ways to estimate, including a swatch method that's accurate to within a few percent.
Read guide
Yarn7 min readYarn Weight Chart: Categories 0 to 7 Explained for Crochet
What yarn weight really means, the standard 0–7 chart with hooks and gauges, international ply names, how to identify unlabeled yarn, and how to substitute one yarn for another.
Read guide
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