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Standard Yarn Weight System

jumbo #7 symbol

New Yarn Weight Category Added

Over the past year a variety of super thick yarns have been introduced to the marketplace. These yarns, many used for arm knitting, do not fit the current gauge guidelines in the Council’s Standard Yarn Weight System. Accordingly, the Council consulted with industry manufacturers and publishers and the decision was made to add a seventh category to its Yarn Weight System called “Jumbo.” This addition also resulted in slight gauge adjustments to its Super Bulky category #6. The goal with this change is to make it easier for crocheters and knitters to understand the type of fabric these Jumbo yarns create and the range of hooks and needles generally required.

See the crochet and knit gauge ranges below for the new Jumbo Yarn Weight #7 and also note the slight gauge changes for Super Bulky Yarn Weight #6.

Categories of yarn, gauge ranges, and recommended needle and hook sizes

Yarn Weight Symbol
& Category Names
lace super fine fine light medium bulky super bulky jumbo
Type of
Yarns in
Category
Fingering
10-count
crochet
thread
Sock, Fingering, Baby Sport,
Baby
DK,
Light
Worsted
Worsted,
Afghan,
Aran
Chunky,
Craft,
Rug
Super Bulky,
Roving
Jumbo,
Roving
Knit Gauge
Range* in
Stockinette
Stitch to 4 inches
33–40**
sts
27–32
sts
23–26
sts
21–24
sts
16–20
sts
12–15
sts
7–11
sts
6 sts and fewer
Recommended
Needle in
Metric Size
Range
1.5–2.25
mm
2.25—
3.25
mm
3.25—
3.75
mm
3.75—
4.5
mm
4.5—
5.5
mm
5.5—
8
mm
8—
12.75 mm
12.75 mm and larger
Recommended
Needle U.S.
Size Range
000–1 1 to 3 3 to 5 5 to 7 7 to 9 9 to 11 11
to 17
17
and
larger
Crochet Gauge*
Ranges in
Single Crochet
to 4 inch
32–42
double
crochets**
21–32
sts
16–20
sts
12–17
sts
11–14
sts
8–11
sts
6–9
sts
5 sts and fewer
Recommended
Hook in Metric
Size Range
Steel***
1.6–1.4
mm
2.25—
3.5
mm
3.5—
4.5
mm
4.5—
5.5
mm
5.5—
6.5
mm
6.5—
9
mm
9—
16 mm
16
mm and
larger
Recommended
Hook U.S.
Size Range
Steel***
6, 7, 8
Regular
hook B–1
B–1
to
E–4
E–4
to
7
7
to
I–9
I–9
to
K–10 1⁄2
K–10 1⁄2 to
M–13
M–13
to Q
Q
and
larger

* GUIDELINES ONLY: The above reflect the most commonly used gauges and needle or hook sizes for specific yarn categories.

** Lace weight yarns are usually knitted or crocheted on larger needles and hooks to create lacy, openwork patterns. Accordingly, a gauge range is difficult to determine. Always follow the gauge stated in your pattern.

*** Steel crochet hooks are sized differently from regular hooks—the higher the number, the smaller the hook, which is the reverse of regular hook sizing