4 Medium yarn: Worsted, afghan, aran
Weight 4 (Medium) yarn is Worsted, afghan, aran yarn in the Craft Yarn Council’s Standard Yarn Weight System.
Knit: 16–20 sts per 4 in (10 cm) on 4.5–5.5 mm (US 7–9) needles. Crochet: 11–14 sc per 4 in (10 cm) on a 5.5–6.5 mm (I-9 – K-10½) hook. 9–12 wraps per inch.
4 Medium at a glance
4 Medium at a glance| What | Typical |
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| 4 Medium | Worsted, afghan, aran |
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| Knit gauge | 16–20 sts per 4 in (10 cm) |
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| Needles | 4.5–5.5 mm (US 7–9) |
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| Crochet gauge | 11–14 sc per 4 in (10 cm) |
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| Hooks | 5.5–6.5 mm (US I-9 – K-10½) |
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| Wraps per inch | 9–12 |
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Crochet hooks for 4 Medium yarn
Crochet hooks for 4 Medium yarn| mm | US |
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| 5.5 mm | I-9 |
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| 6 mm | J-10 |
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| 6.5 mm | K-10½ |
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Knitting needles for 4 Medium yarn
Knitting needles for 4 Medium yarn| US | mm |
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| 7 | 4.5 mm |
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| 8 | 5 mm |
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| 9 | 5.5 mm |
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How much 4 Medium yarn for common projects
How much 4 Medium yarn for common projects| Project | Single crochet | Knit |
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| Adult hat | 160 yd | 120 yd |
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| Scarf 8 × 60 in | 450 yd | 350 yd |
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| Baby blanket 36 × 36 in | 1,220 yd | 950 yd |
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| Throw 50 × 60 in | 2,840 yd | 2,210 yd |
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| Sweater, size M | 1,230 yd | 960 yd |
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The Craft Yarn Council’s Standard Yarn Weight System. Gauges are stitches per 4 in (10 cm): knit in stockinette, crochet in single crochet (lace in double crochet). CYC calls them guidelines: your pattern’s gauge comes first.
Project yardage is an estimate from the StitchTick yarn calculator (single crochet and stockinette); your stitch and tension change it.
Frequently asked questions
What is weight 4 yarn?
Weight 4 (Medium) yarn is Worsted, afghan, aran yarn in the Craft Yarn Council’s Standard Yarn Weight System.
What hook and needles do I use for weight 4 yarn?
The Craft Yarn Council suggests a 5.5–6.5 mm (I-9 – K-10½) hook and 4.5–5.5 mm (US 7–9) needles. Your pattern’s gauge comes first.
Can I swap one yarn weight for another?
Only with a new gauge swatch: a different weight changes the size of every stitch, and the yardage you need.