The picks
Best US Size 9 Knitting Needles
Five and a half millimeters: the one size that belongs to two yarn weights at once.
By Sawyer V. · Published October 12, 2026
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The short answer
US 9 is 5.5mm, and it is the only needle size the standard gives to two yarn weights at once - worsted runs 4.5 to 5.5mm (US 7 to 9) and bulky starts at 5.5mm (US 9 to 11). That makes it less a size patterns name and more the size you move to when your gauge is tight on a US 8, or down to when a bulky yarn is sloppy on a US 10. Buy a 24in fixed circular if you are buying one needle, double points for sleeve cuffs and hat crowns, and a 40in cable if the project is wider than about 30 inches. Skip 9in straights at this gauge - they hold around 36 stitches and a scarf needs more.
| # | Product | Best for | Format | Price |
|---|---|---|---|---|
| 1 | KnitPro Dreamz Fixed Circular Needle, US 9 (5.5mm), 24inLaminated birch tips on a 24in cord. Wood grip at a size where worsted is slightly loose and bulky is slightly tight. | Sweater bodies, hats, cowls - the everyday 5.5mm needle | Fixed circular | $16.81 - View on Amazon#ad disclosure - price as of October 12, 2026 |
| 2 |  ChiaoGoo Red 6in Stainless Double Point Needles, US 9 (5.5mm)Five stainless double points at 5.5mm - where a worsted sleeve and a bulky hat crown both finish. | Sleeve cuffs, hat crowns, mittens | Double points | $14.68 - View on Amazon |
| 3 |  KnitPro Dreamz Fixed Circular Needle, US 9 (5.5mm), 40inThe same birch tips on a 40in cord - the length a blanket actually needs at 5.5mm. | Anything wider than about 30 inches | Fixed circular | $16.09 - View on Amazon#ad disclosure - price as of October 12, 2026 |
| 4 |  Susan Bates Silvalume Single Point Needles, US 9 (5.5mm), 14inFourteen-inch aluminum straights - long enough to actually hold a scarf's width at this gauge. | Scarves and flat panels, for anyone who prefers straights | Straights | $13.99 - View on Amazon#ad disclosure - price as of October 12, 2026 |
| 5 |  ChiaoGoo TWIST Red Lace Interchangeable Set (Complete, 5in tips)Thirteen tip pairs covering US 2-15, so 5.5mm comes in the box - and so do the sizes either side of it. | Owning this size and every other one you will reach for | Interchangeable set | $216.80 - View on Amazon#ad disclosure - price as of October 12, 2026 |
| 6 |  Clover Takumi Bamboo Single Point Needles, US 9 (5.5mm), 9inThe cheapest 5.5mm here at nine inches long, and nine inches is too short for most of what people knit at this gauge. | Narrow flat work only - not a scarf | Straights | $7.90 - View on Amazon#ad disclosure - price as of October 12, 2026 |
KnitPro Dreamz Fixed Circular Needle, US 9 (5.5mm), 24in
KnitPro · Best for sweater bodies, hats, cowls - the everyday 5.5mm needle
Laminated birch tips at 5.5mm on a 24in cord - wood grip at the one size where worsted and bulky overlap. Sold as Knitter's Pride in North America until KnitPro unified the names in 2024.
- Size
- US 9 (5.5mm)
- Length
- 24in (60cm) overall, 13.9in cord
- Tips
- 5.05in laminated birch, one color per size
- Material
- Laminated birch, polished
- Marking
- Size etched on the metal needle base
- Format
- Fixed circular
Who it suits
Anyone who got 5.5mm on a swatch and now needs the needle, and anyone who prefers wood to metal.
Why it is here
US 9 (5.5mm), 24in (60cm) overall on a 13.9in cord, with 5.05in laminated birch tips, one color per size and the size etched on the metal needle base. Twenty-four inches is the most useful single length at this gauge - it handles a sweater body, a hat on magic loop and flat knitting. The brand note worth knowing: this line sold as Knitter's Pride in North America until KnitPro unified the names in 2024, so both spellings are the same needle.
What you give up
One length per purchase, and wood tips are blunter than steel on a tight decrease. Laminated birch is strong but it is still wood - if you knit tightly enough to flex a needle, choose steel.
Specifications from Knitter's Pride Dreamz fixed circular needles 24in - retail specification. We have not handled this item - see how we pick.
ChiaoGoo Red 6in Stainless Double Point Needles, US 9 (5.5mm)
ChiaoGoo · Best for sleeve cuffs, hat crowns, mittens
Five stainless double points at 5.5mm - the size a worsted sleeve cuff and a bulky hat crown both land on.
- Size
- US 9 (5.5mm)
- Material
- Stainless steel, precisely machined
- Length
- 6in (15cm)
- Pack
- Five needles
- Point and finish
- Tapered points, satin finish
- Marking
- Size laser etched on every needle
Who it suits
Anyone knitting a sweater in the round who has reached the sleeves, and anyone closing a hat.
Why it is here
Five 6in (15cm) stainless steel double points at US 9 (5.5mm), precisely machined, with tapered points, a satin finish and the size laser etched on every needle. This is the size most worsted sleeve cuffs land on once you have gone up from a US 8 body, and steel does not flex when a nearly-finished sleeve puts its weight on a short needle.
What you give up
Steel is slick, and 5.5mm stitches are large enough to slide off the idle needles if you put the work down mid-round. Six-inch points also hold relatively few stitches at this gauge.
Specifications from ChiaoGoo 6in stainless double point needles - retail specification. We have not handled this item - see how we pick.
KnitPro Dreamz Fixed Circular Needle, US 9 (5.5mm), 40in
KnitPro · Best for anything wider than about 30 inches
The same birch tips on a 40in cord - the length a blanket or a large shawl actually needs at this gauge.
- Size
- US 9 (5.5mm)
- Length
- 40in (100cm) overall, 29.9in cord
- Tips
- 5.05in laminated birch, one color per size
- Material
- Laminated birch, polished
- Marking
- Size etched on the metal needle base
- Format
- Fixed circular
Who it suits
Anyone knitting a throw, a large shawl or a wide wrap, and anyone whose stitches are stretched tight on a 24in cable.
Why it is here
US 9 (5.5mm), 40in (100cm) overall on a 29.9in cord, same 5.05in laminated birch tips. A 5.5mm stitch takes noticeably more cable than a 4mm one, so a wide project fills a 24in cord far sooner than people expect - and stitches stretched tight across a short cable distort your gauge reading as well as being unpleasant to work.
What you give up
Forty inches is unwieldy for a hat or a sleeve, so this is a second needle rather than a first. The long cord also needs managing on a small project.
Specifications from Knitter's Pride Dreamz fixed circular needles 40in - retail specification. We have not handled this item - see how we pick.
Susan Bates Silvalume Single Point Needles, US 9 (5.5mm), 14in
Susan Bates · Best for scarves and flat panels, for anyone who prefers straights
Fourteen-inch aluminum straights at 5.5mm - long enough to hold a scarf's width, which the 9in bamboo version is not.
- Size
- US 9 (5.5mm)
- Material
- Aluminum, anodized, heat treated and polished
- Length
- 14in
- Pack
- Two needles - one pair
- Knob
- No-roll shape, US and metric size printed on it
- Color
- Red, per the listing
Who it suits
Anyone who knits flat and dislikes circulars, and anyone making a scarf or a blanket square.
Why it is here
A pair of 14in anodized aluminum straights at US 9 (5.5mm), heat treated and polished, with a no-roll knob carrying the US and metric size printed on it. Fourteen inches rather than ten matters here: 5.5mm stitches are wide, so a scarf fills a short needle quickly and then the stitches crowd and fall off the end.
What you give up
Straights only knit flat, and aluminum is slick at a size where the stitches are already large. Printed sizing on the knob also wears less well than etched sizing on the needle itself.
Specifications from Susan Bates Silvalume single point needles - retail specification. We have not handled this item - see how we pick.
ChiaoGoo TWIST Red Lace Interchangeable Set (Complete, 5in tips)
ChiaoGoo · Best for owning this size and every other one you will reach for
Thirteen pairs of surgical stainless lace tips on memory-free red nylon-coated steel cables, with a lifeline hole through every tip.
- Tips
- 13 pairs, 5in (13cm), US 2-15 (2.75-10mm)
- Tip material
- Surgical-grade stainless steel, lace point
- Cables
- Multi-strand steel core, red nylon coating; 2 x 14in, 2 x 22in, 2 x 30in
- Notable
- Lifeline hole in each tip; memory-free cable
- Also included
- Stitch markers, two keys, needle gauge, stoppers, connector, case
Who it suits
Anyone who keeps buying the boundary sizes one at a time, which is exactly what US 9 makes you do.
Why it is here
Thirteen pairs of 5in surgical-grade stainless tips covering US 2-15 (2.75-10mm) on memory-free multi-strand steel cables with a red nylon coating, plus stitch markers, two keys, a needle gauge, stoppers and a connector. For this size specifically a set earns its price: gauge adjustment means moving between US 8, 9 and 10, and owning all three is the whole point.
What you give up
Five-inch tips are short, which some hands dislike on a long session. It is also a significant purchase to make for one needle size - buy it because you want the set, not because you want 5.5mm.
Specifications from ChiaoGoo TWIST Red Lace set specification. We have not handled this item - see how we pick.
Clover Takumi Bamboo Single Point Needles, US 9 (5.5mm), 9in
Clover · Best for narrow flat work only - not a scarf
The cheapest 5.5mm on the page, and nine inches long - which is the problem rather than the feature at this gauge.
- Size
- US 9 (5.5mm)
- Length
- 9in
- Material
- Bamboo
- Point
- Tapered
- Sold as
- A pair, one size per pack
- Format
- Single point - flat knitting only
Who it suits
Only someone making something genuinely narrow - a strap, a headband, a swatch.
Why it is here
A pair of 9in bamboo single points at US 9 (5.5mm), tapered, flat knitting only. The bamboo itself is fine and the price is the lowest on this page. The problem is arithmetic: at 5.5mm you get roughly four stitches to the inch, so a 9in needle holds about 36 stitches before they crowd the tip - and a basic scarf is 40 or more. People buy it for a scarf and fight it for the whole project.
What you give up
You give up a few dollars by choosing the 14in straights instead. If you specifically want bamboo straights, the same Takumi line is made in 13in and 14in - buy that length rather than this one.
Specifications from Clover USA - Takumi bamboo single point needles. We have not handled this item - see how we pick.
The only size in two bands
Most needle sizes belong to one yarn weight. 5.5mm belongs to two, and that is the whole character of the size.
| Category | Common names | Needle range | Knit gauge / 4in |
|---|---|---|---|
| 3 Light | DK, light worsted | 3.75-4.5mm (US 5 to 7) | 21-24 sts |
| 4 Medium | Worsted, afghan, aran | 4.5-5.5mm (US 7 to 9) | 16-20 sts |
| 5 Bulky | Chunky, craft, rug | 5.5-8mm (US 9 to 11) | 12-15 sts |
Worsted tops out at 5.5mm. Bulky starts at 5.5mm. US 9 is the overlap, which means a pattern naming it has told you very little about the yarn - unlike a US 10, which is bulky and nothing else, or a US 8, which is the worsted default.
US 8, 9 or 10?
This is the decision this size actually poses, and it is not answered by the pattern - it is answered by your own swatch.
| Needle | Metric | With worsted | With bulky |
|---|---|---|---|
| US 7 | 4.5mm | Dense, firm - good for bags | Too tight to work |
| US 8 | 5.0mm | The default; most patterns | Very dense |
| US 9 | 5.5mm | Looser, drapier worsted | Dense, structured bulky |
| US 10 | 6.0mm | Loose, open worsted | The bulky default |
| US 11 | 8.0mm | Too open - gaps | Loose, fast bulky |
- Swatch on the size the pattern names first. Usually US 8 for worsted.
- Count stitches over four inches, not one. A single inch multiplies small errors across a garment.
- Too many stitches means go up. More stitches per inch than the pattern says means your fabric is tighter than intended - US 9 is the next step.
- Too few means go down, to a US 7.
- Wash and dry the swatch before you measure. Superwash merino in particular grows, and a dry unwashed swatch will send you to the wrong needle.
- Match the stitch gauge and let row gauge go if you can only have one. Width is what makes a garment fit.
Cable length at 5.5mm
A 5.5mm stitch is meaningfully wider than a 4mm one, and cable length is the thing people underestimate when they move up the scale.
- 16in - hats and yokes. Too short for anything flat.
- 24in - the default single purchase. Sweater bodies, flat knitting, magic loop for sleeves.
- 32in - a roomier sweater body, and comfortable for a large shawl.
- 40in and up - blankets, wide wraps, and anything over about 30 inches across.
- Stitches stretched tight across a short cable distort your gauge reading, so if you are swatching in the round on a cable that is too short, the number you get is not your gauge.
Circular needle cable lengths has the full length-to-project mapping, and interchangeable needle cables and connectors covers buying cables separately if you own a set.
Every set includes this one
| Set | Tip range | US 9 included? |
|---|---|---|
| ChiaoGoo TWIST Red Lace Complete | US 2-15 (2.75-10mm) | Yes |
| addi Click Turbo | US 4-15 (3.5-10mm) | Yes |
| Knitter's Pride Dreamz Deluxe | US 4-11 (3.5-8.0mm) | Yes |
Unlike US 15, which two of these three reach only at the very top and the third misses entirely, 5.5mm sits comfortably inside all of them. If you own any set, check the case before buying anything - and if you do not own one, this is the size that makes the argument for a set, because gauge adjustment means wanting US 8, 9 and 10 within the same project.
What people knit at 5.5mm
- Worsted sweaters at a looser gauge, which is the commonest reason this size is bought.
- Bulky hats and cowls that want structure rather than drape - 5.5mm gives a denser bulky fabric than a US 10 does.
- Blankets in worsted, where a slightly open fabric is warmer for the weight and much faster.
- Shawls in worsted or aran, where drape matters and a US 8 fabric would be stiff.
- Worsted held with a strand of mohair, which lands around this gauge - holding mohair double has the arithmetic.
For what to put on the needle, best needles for chunky yarn approaches the same range from the yarn side, and the needle size chart has every US-to-metric conversion.
Buying without getting the wrong size
- Buy on the millimeter figure. US 9 is 5.5mm. The sizes either side are 5.0mm and 6.0mm, and listings at adjacent sizes are mixed up constantly.
- Watch for US 9 versus 9in. Several products in this category are described by length, and a 'Takumi 9-inch, Size 9' is both at once - read which number is which.
- Check the cable length in the title, not the photo. The same tip size is sold on five different cords.
- Metric-only listings are common, especially from European brands. A needle sold as 5.5mm with no US number is a US 9.
- If you own a set, you already have it. All three sets above include 5.5mm.
Questions people actually ask
What size is a US 9 knitting needle in mm?
US 9 is 5.5mm. The sizes either side are US 8 at 5.0mm and US 10 at 6.0mm, so the steps here are half a millimeter - small enough that buying the wrong one is easy and noticeable.
What yarn do you use with size 9 needles?
Both worsted and bulky. The standard puts worsted at 4.5 to 5.5mm and bulky at 5.5 to 8mm, so 5.5mm is the only size claimed by two weight bands. With worsted it gives a looser, drapier fabric than a US 8; with bulky it gives a denser, more structured one than a US 10.
Should I use US 8 or US 9 for worsted yarn?
Start with US 8 - that is what most worsted patterns assume - then swatch. If you get more stitches to four inches than the pattern calls for, your fabric is too tight and US 9 is the next step up. Wash and dry the swatch before measuring, because some yarns grow.
Is US 9 the same as 5.5mm?
Yes. A needle sold as 5.5mm with no US number is a US 9, which is common with European brands. Buy on the millimeter figure - it is the one that cannot be ambiguous.
What cable length do I need for size 9 needles?
24 inches as a single purchase - it covers sweater bodies, flat knitting and magic loop. Go to 40 inches for a blanket or a wide shawl, because a 5.5mm stitch takes noticeably more cable than a finer one and stitches stretched tight across a short cord also distort your gauge reading.
Do interchangeable needle sets include US 9?
All three we list do - the ChiaoGoo TWIST Red Lace Complete (US 2-15), the addi Click Turbo (US 4-15) and the Knitter's Pride Dreamz Deluxe (US 4-11). Check your case before buying a single needle, and note this is the size that makes the best argument for owning a set, because gauge adjustment means wanting US 8, 9 and 10 together.
Are 9 inch straight needles long enough at this size?
Usually not. At 5.5mm you get roughly four stitches to the inch, so a 9in needle holds about 36 stitches before they crowd the tip - and a plain scarf is 40 or more. Choose 13in or 14in straights at this gauge, or use a circular and knit flat on it.
Sources
- Craft Yarn Council - Standard Yarn Weight System
- Knitter's Pride Dreamz fixed circular needles 24in - retail specification
- Knitter's Pride Dreamz fixed circular needles 40in - retail specification
- ChiaoGoo 6in stainless double point needles - retail specification
- Susan Bates Silvalume single point needles - retail specification
- Clover USA - Takumi bamboo knitting needles
- ChiaoGoo TWIST Red Lace set specification
- addi Click Turbo set specification
- Knitter's Pride Dreamz Deluxe interchangeable set - retail specification
- Yarnspirations - Patons Classic Wool Worsted specification
- Cascade Yarns - 220 Superwash Merino specification
- Lion Brand - Heartland specification