A typical adult hat needs 150–250 m of DK-weight yarn — small in total, but the crown decreases and a folded brim make it denser than it looks.
Hats are compact but not trivial to estimate. A folded ribbed brim doubles the yarn in that section — the brim is knitted twice as long as it appears worn. Crown decreases create a dome that's geometrically denser near the top; the final 20% of rows close a lot of area quickly. Colourwork hats (stranded Fair Isle) can use up to 90% more yarn than plain stockinette across the whole hat, not just the patterned section, because of floats on the wrong side. Crochet hats use about 20% more yarn than knitted hats of the same size because single-crochet fabric is denser.
Calculated with 8 yarn weights, size M, 15% reserve. Pattern: Knitting → Stockinette · Crochet → Double crochet.
| Yarn weight | Meters per 100 g | Balls needed | Total meters | Approx grams |
|---|---|---|---|---|
| Lace | 600–1200+ m / 100g | 1 | 166 m | ~21 g |
| Fingering | 350–550 m / 100g | 1 | 187 m | ~43 g |
| Sport | 250–350 m / 100g | 1 | 168 m | ~56 g |
| DK | 200–300 m / 100g | 1 | 176 m | ~70 g |
| Worsted / Aran | 150–220 m / 100g | 1 | 149 m | ~81 g |
| Bulky | 80–140 m / 100g | 2 | 118 m | ~108 g |
| Super Bulky | 40–80 m / 100g | 2 | 82 m | ~137 g |
| Jumbo | < 40 m / 100g | 2 | 50 m | ~166 g |
| Yarn weight | Meters per 100 g | Balls needed | Total meters | Approx grams |
|---|---|---|---|---|
| Lace | 600–1200+ m / 100g | 1 | 199 m | ~25 g |
| Fingering | 350–550 m / 100g | 1 | 224 m | ~52 g |
| Sport | 250–350 m / 100g | 1 | 201 m | ~67 g |
| DK | 200–300 m / 100g | 1 | 211 m | ~84 g |
| Worsted / Aran | 150–220 m / 100g | 1 | 179 m | ~97 g |
| Bulky | 80–140 m / 100g | 2 | 142 m | ~129 g |
| Super Bulky | 40–80 m / 100g | 2 | 98 m | ~164 g |
| Jumbo | < 40 m / 100g | 2 | 60 m | ~199 g |
The yardage multiplier (×) shows how much more yarn each stitch uses relative to stockinette / double crochet baseline. Sorted by yarn efficiency.
Open mesh saves yarn
Baseline—minimum yardage
Bulkier, +20%
Crossings eat +35%
Two-yarn floats
Minimum draw
Open motifs
Pieced motifs
Airier, lighter
Between sc and dc
Tightest fabric
Fabric area scales from XS to 2XL. Use this to understand why larger sizes need significantly more yarn.
| Size | Area multiplier | Fabric area (m²) |
|---|---|---|
| XS | ×0.78(-22%) | 0.14 m² |
| S | ×0.88(-12%) | 0.16 m² |
| M | ×1.00(baseline) | 0.18 m² |
| L | ×1.14(+14%) | 0.21 m² |
| XL | ×1.28(+28%) | 0.23 m² |
| 2XL | ×1.42(+42%) | 0.26 m² |
They're empirical multipliers measured against stockinette (1.0). Cables and stranded colourwork eat more yarn because of the extra bulk; lace and filet use less. The numbers are averages — if your tension is unusual, drop in a real swatch in advanced mode and we'll override them.
Simple mode falls back to typical gauges for the yarn weight you picked. For wearables we still recommend a 10×10 cm swatch — once you have one, switch to advanced mode and the maths gets sharper.
The base calc is area-based. Tricky shapes (raglan, A-line, hooded) are absorbed by the 10–20% buffer; for full-body cabled sweaters or steeked cardigans we suggest pushing it to 25%.
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