US Size 10.5 Knitting Needles (6.5 mm): Yarn Weight, Gauge and Conversions
A US size 10.5 knitting needle is 6.5 mm in diameter, old UK and Canadian size 3. It suits bulky (chunky) yarn, which knits at 12 to 15 stitches per 4 inches. At about 14 stitches per 4 inches, a 20 inch hat needs about 72 stitches and an 8 inch scarf about 28.
Knitting needle size is the diameter of the shaft, measured in millimeters. This needle is 6.5 mm, about 0.26 inch across. US size 10.5 is the American label for a 6.5 mm needle, and old UK and Canadian size 3 is the same needle. The millimeter figure is the one that matches across every brand, so it is printed on most needles and needle gauges.
What is a US 10.5 knitting needle in mm and old UK sizes?
| Metric | 6.5 mm |
|---|---|
| Inches (diameter) | 0.26 in |
| US size | 10.5 |
| Old UK and Canadian size | 3 |
| Crochet hook, same diameter | K-10.5 (6.5 mm) |
| Usual yarn weight | bulky (chunky) |
| Estimated gauge | about 14 stitches per 4 in |
What yarn weight goes with US 10.5 needles?
The Craft Yarn Council lists 6.5 mm inside the recommended needle range for the yarn weights below. The hat and scarf columns show how many stitches the full gauge range of each weight gives, so you can see how much the yarn choice moves the numbers.
| Yarn weight | CYC needle range | Gauge per 4 in | 20 in hat | 8 in scarf |
|---|---|---|---|---|
| Bulky (chunky) | 5.5 to 8 mm (US 9 to 11) | 12 to 15 | 60 to 76 | 24 to 30 |
How many stitches do you cast on with US 10.5 needles?
The estimated gauge places 6.5 mm within the CYC range for bulky (chunky) yarn: the smallest recommended needle gets the most stitches per 4 inches and the largest gets the fewest. That gives about 14 stitches per 4 inches on this needle. Circular pieces are rounded to a multiple of 4 so 2x2 ribbing works out.
| Piece | Width or circumference | Cast on (estimate) |
|---|---|---|
| Hat, 20 in around (multiple of 4) | 20 in | about 72 |
| Snug hat, 18 in around | 18 in | about 64 |
| Cowl, 24 in around | 24 in | about 84 |
| Scarf, 8 in wide | 8 in | about 28 |
| Baby blanket, 42 in wide | 42 in | about 147 |
| Throw, 50 in wide | 50 in | about 175 |
Swatch before you trust any cast-on number
Knit a swatch at least 6 inches wide, wash and dry it the way you will treat the finished piece, then count stitches across the center 4 inches. Put your real number into the cast-on calculator for an exact count.
Needles and supplies for US 10.5 (6.5 mm)
Knit Picks Sunstruck Wood Interchangeable Needle Set, US 4 to 11
$77.47Nine pairs of birch tips from US 4 to 11 (3.5 to 8 mm) with four cables, the budget way to own every mid size.
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Clover Takumi Bamboo Combo Interchangeable Circular Needle Set
$95.59Bamboo tips from US 3 to 15 (3.25 to 10 mm) with five cord lengths for 60 combinations.
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Clover Universal Knitting Counter
$8.64A row counter that slips onto needles from US 0 to 15 so you never lose your place.
Check pricePrices change often, so confirm on Amazon. As an Amazon Associate we earn from qualifying purchases.
What crochet hook matches a US 10.5 knitting needle?
The K-10.5 crochet hook is also 6.5 mm. Diameter is where the match ends, though: crochet fabric is denser, so CYC pairs bulky (chunky) yarn with 5.5 to 8 mm (US 9 to 11) needles but larger hooks. A 6.5 mm hook usually suits a lighter yarn than a 6.5 mm needle does.
What are the knitting needle sizes next to US 10.5?
Frequently asked questions
What size is a US 10.5 knitting needle in mm?
A US size 10.5 needle is 6.5 mm in diameter, about 0.26 inch. The old UK and Canadian size is 3. US numbers were never fully standardized, so trust the millimeter size printed on the needle or check it in a needle gauge. The neighboring sizes are US 10 (6 mm) and 7 mm.
What yarn weight do you use with US size 10.5 needles?
CYC places 6.5 mm inside the recommended needle range for bulky (chunky) yarn. Bulky (chunky) is the usual match: its range is 5.5 to 8 mm (US 9 to 11), knitting at 12 to 15 stitches per 4 inches. The size sits inside a single category, so it is a straightforward match. Your pattern gauge matters more than the category name.
How many stitches do I cast on for a hat with US 10.5 needles?
At about 14 stitches per 4 inches, our estimate for bulky (chunky) yarn on 6.5 mm needles, a 20 inch hat needs about 72 stitches, rounded to a multiple of 4 for ribbing. For a snug fit many patterns size the hat 1 to 2 inches smaller than the head, which is about 64 stitches at 18 inches. The estimate places the needle within the CYC gauge range, so knit a swatch and recount before you cast on.
How many stitches for a scarf on US 10.5 needles?
Cast on about 28 stitches for an 8 inch wide scarf at 14 stitches per 4 inches. A 6 inch scarf needs about 21 and a 10 inch scarf about 35. Stitch pattern changes both width and yarn: garter stitch used about 46 percent more yarn than stockinette in one test. A quick 4 inch swatch in the stitch you plan to use gives a better count than the label gauge.
What crochet hook is the same size as a US 10.5 knitting needle?
The K-10.5 crochet hook is also 6.5 mm, so the two share a diameter. They are not interchangeable for the same yarn, though. CYC pairs bulky (chunky) yarn with 5.5 to 8 mm (US 9 to 11) needles but 6.5 to 9 mm (K-10.5 to M-13) hooks, because crochet fabric is denser. A 6.5 mm hook usually suits a lighter yarn than a 6.5 mm needle does.
Are US size 10.5 needles good for beginners?
They can be, for quick projects. At 6.5 mm a throw can be as few as 175 stitches across, so finished pieces appear fast and stitches are easy to see. The trade-offs are heavy yarn, large loops that loosen easily and less forgiving tension, so start with a cowl or scarf before a blanket.
How we research: we compare manufacturer specifications, owner manuals, published standards and recurring themes in verified owner reviews. We do not test products in person, and this is researched guidance, not professional advice. Follow your machine manual and pattern, and take care with rotary cutters, hot irons and needles. As an Amazon Associate we earn from qualifying purchases.