Tools
Reverse Yarn & Stash-Buster Calculator: Grams to Yards
Put your half-used ball on a kitchen scale, pick the yarn from our database or type the numbers from its label, and see instantly how many meters and yards are left — and exactly what you can still crochet with them, from granny squares to a full beanie.
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Exact remaining length
Enter the weight of your leftover yarn and the full ball data to see the results.
65 yd (59 m)
35 % of a full ball left · 170 m per 100 g
What you can crochet right now
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Granny squares 10 × 10 cm (4 × 4 in) You can make 5 squares · 13 yd per square✅ Enough yarn
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Amigurumi sphere (single crochet) Maximum diameter: 4.4 in✅ Enough yarn
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Scarf 18 cm (7 in) wide You can crochet up to 8.5 in (full scarf: 70.9 in)⚠️ Short by 9.05 oz · Need +3 balls Buy +3 balls of CYC #4 Medium yarn on Amazon →
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Adult beanie Needs ≈ 171 yd (3.24 oz)⚠️ Short by 2.01 oz · Need +1 ball Buy +1 ball of CYC #4 Medium yarn on Amazon →
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Round coaster ⌀ 10 cm (4 in) Needs ≈ 13 yd (0.25 oz) · enough for 4✅ Enough yarn
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Headband / ear warmer (52 × 8 cm) Needs ≈ 70 yd (1.32 oz)⚠️ Short by 0.09 oz · Need +1 ball Buy +1 ball of CYC #4 Medium yarn on Amazon →
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Pair of adult mittens Needs ≈ 181 yd (3.44 oz)⚠️ Short by 2.21 oz · Need +1 ball Buy +1 ball of CYC #4 Medium yarn on Amazon →
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Estimates: calibrated model of our yarn calculator with a 10 % safety margin. Sizes used: granny square 10 × 10 cm in granny stitch; sphere in single crochet (smallest useful 5 cm); scarf 18 × 180 cm; adult beanie 54 × 21 cm; coaster ⌀ 10 cm; headband 52 × 8 cm; mittens 2 × (20 × 25 cm + thumb 7 × 6 cm). Your tension can change real use by ±15 %.
Leftover yarn reference: length per 10 g and what 50 g makes
Typical length per weight for each Craft Yarn Council category and what a 50 g leftover gives with our calibrated model (10 % margin included).
| Weight (CYC) | Typical m per 100 g | Length per 10 g | A 50 g leftover gives | Granny squares 10 cm from 50 g | Adult beanie in single crochet needs |
|---|---|---|---|---|---|
| 0 – Lace | 800 m | 80 m · 87.5 yd | 400 m · 437 yd | 15 | 43 g (1.5 oz) |
| 1 – Super Fine | 400 m | 40 m · 43.7 yd | 200 m · 219 yd | 11 | 60 g (2.1 oz) |
| 2 – Fine | 300 m | 30 m · 32.8 yd | 150 m · 164 yd | 9 | 70 g (2.4 oz) |
| 3 – Light | 230 m | 23 m · 25.2 yd | 115 m · 126 yd | 8 | 79 g (2.8 oz) |
| 4 – Medium | 170 m | 17 m · 18.6 yd | 85 m · 93 yd | 7 | 92 g (3.2 oz) |
| 5 – Bulky | 110 m | 11 m · 12 yd | 55 m · 60 yd | 5 | 115 g (4 oz) |
| 6 – Super Bulky | 65 m | 6.5 m · 7.1 yd | 33 m · 36 yd | 4 | 149 g (5.2 oz) |
| 7 – Jumbo | 25 m | 2.5 m · 2.7 yd | 13 m · 14 yd | 2 | 240 g (8.4 oz) |
Reference densities are typical values per CYC category, not the specification of a particular yarn. Select your yarn above for its exact label data.
How it works: the math behind the tool
Yarn is sold by weight, and its length is proportional to its weight. That is why the remaining length is simply the fraction of the ball you still have multiplied by the length on the label: weigh the leftover without the paper band or cardboard core, divide by the full ball weight and multiply by the full ball length.
To decide what you can crochet, we use the same calibrated model as our yarn calculator: meters = area (cm²) ÷ 100 × 0.82 × √(meters per 100 g) × stitch factor, plus a 10 % safety margin. Thicker yarns and denser stitches (single crochet 1.30, waffle 1.85) use more length per area than double crochet (1.00) or granny stitch (1.00).
Remaining length = (remaining weight ÷ full ball weight) × full ball length
Project sizes are stated, not invented: a 10 × 10 cm granny square, an amigurumi sphere in single crochet, an 18 cm wide scarf (full length 180 cm), our standard adult beanie (54 × 21 cm), a 10 cm round coaster, a 52 × 8 cm headband and a pair of adult mittens (two 20 × 25 cm tubes plus thumbs). When a project does not fit, you see how many grams you are short and how many extra balls you need.
Last updated: November 8, 2026
Frequently asked questions
How do I know how many yards are left in a ball of yarn?
Weigh the leftover on a kitchen scale (without the paper band), divide by the full ball weight on the label and multiply by the full ball length. For example, 35 g left of a 100 g / 170 m ball is 0.35 × 170 = 59.5 m (about 65 yd).
How many granny squares can I make with leftover yarn?
A 10 × 10 cm (4 × 4 in) granny square in worsted weight uses roughly 12 m with a 10 % margin, so 50 g of a 170 m/100 g yarn makes about 7 squares. Lighter yarns make more squares per gram. The calculator gives the exact number for your yarn.
Is a kitchen scale accurate enough to weigh yarn?
A kitchen scale with 1 g steps is fine for most projects. For small amounts such as amigurumi details or the last few rounds, a 0.1 g precision scale avoids rounding errors of up to 5–10 % on very small leftovers.
What can I crochet with one ball of leftover yarn?
With about 50 g of worsted weight you can usually make several granny squares, coasters, a headband or a small amigurumi. A full adult beanie or a pair of mittens usually needs around 90–100 g. Enter your leftover to see a green or amber status for each project.