US vs. UK vs. Metric Crochet Terms & Hook Sizes Master Chart
The same stitch has different names in US and UK patterns. Check which terms your pattern uses, then match your hook in mm.
US term
UK term
chain (ch)
chain (ch)
double treble crochet (dtr)
triple treble crochet (ttr)
treble crochet (tr)
double treble crochet (dtr)
double crochet (dc)
treble crochet (tr)
half double crochet (hdc)
half treble crochet (htr)
herringbone half double crochet (HBhdc)
herringbone half treble crochet (HBhtr)
single crochet (sc)
double crochet (dc)
back post double crochet (BPdc)
back post treble crochet (BPtr)
front post double crochet (FPdc)
front post treble crochet (FPtr)
slip stitch (sl st)
slip stitch (ss)
Metric
US hook
UK (old)
Yarn weight
2.25 mm
B-1
13
CYC 1
2.75 mm
C-2
12
CYC 1
3.25 mm
D-3
10
CYC 1
3.5 mm
E-4
9
CYC 2
3.75 mm
F-5
—
CYC 2
4 mm
G-6
8
CYC 2
4.5 mm
7
7
CYC 3
5 mm
H-8
6
CYC 3
5.5 mm
I-9
5
CYC 4
6 mm
J-10
4
CYC 4
6.5 mm
K-10½
3
CYC 5
8 mm
L-11
0
CYC 5
9 mm
M/N-13
00
CYC 6
10 mm
N/P-15
000
CYC 6
15 mm
P/Q
—
CYC 7
UK hook sizes are the old imperial numbering; modern UK hooks are labelled in mm. Hooks without a UK size are marked —.
CrochetMetrics · Cheat sheet #2
Standard Yarn Weight System (CYC #0 to #7) Gauge & Yardage Chart
Craft Yarn Council crochet hook and gauge ranges for each weight, with the real meters per 100 g measured in our yarn database.
#
Yarn weight
Hook (mm)
US hook
sc / 10 cm
m per 100 g
0
0 – Lace
1.6–1.4 / 2.25
Steel 6–8 / B-1
32–42
322–322 (Ø 322)
1
1 – Super Fine
2.25–3.5
B-1 – E-4
21–32
250–840 (Ø 404)
2
2 – Fine
3.5–4.5
E-4 – 7
16–20
203–340 (Ø 279)
3
3 – Light
4.5–5.5
7 – I-9
12–17
150–380 (Ø 252)
4
4 – Medium
5.5–6.5
I-9 – K-10½
11–14
84–300 (Ø 173)
5
5 – Bulky
6.5–9
K-10½ – M-13
8–11
86–155 (Ø 121)
6
6 – Super Bulky
9–15
M-13 – Q
7–9
52–120 (Ø 91)
7
7 – Jumbo
15+
Q+
≤6
—
Gauge in single crochet over 10 cm (4 in); Lace is measured in double crochet. m/100 g: range and average (Ø) of the 128 verified yarns in our database.
CrochetMetrics · Cheat sheet #3
Crochet Hat Sizing Master Chart (Crown Diameter & Total Height for All Ages)
Head circumference, finished hat circumference with 10 % negative ease, flat crown diameter (circumference ÷ π) and total height.
Age / size
Head
Hat (−10 %)
Crown ⌀
Height
Preemie
30.5 cm · 12 in
27.5 cm · 10.8 in
8.7 cm · 3.4 in
10 cm · 3.9 in
Newborn
35.5 cm · 14 in
32 cm · 12.6 in
10.2 cm · 4 in
12.5 cm · 4.9 in
Baby 6–12 months
43 cm · 16.9 in
38.7 cm · 15.2 in
12.3 cm · 4.8 in
15.5 cm · 6.1 in
Toddler 2–4 years
48 cm · 18.9 in
43.2 cm · 17 in
13.8 cm · 5.4 in
18 cm · 7.1 in
Child 4+
51 cm · 20.1 in
45.9 cm · 18.1 in
14.6 cm · 5.8 in
20.5 cm · 8.1 in
Teen / small adult
53.5 cm · 21.1 in
48.2 cm · 19 in
15.3 cm · 6 in
21.5 cm · 8.5 in
Medium adult
56 cm · 22 in
50.4 cm · 19.8 in
16 cm · 6.3 in
23 cm · 9.1 in
Large adult
58.5 cm · 23 in
52.7 cm · 20.7 in
16.8 cm · 6.6 in
24 cm · 9.4 in
Extra-large adult
61 cm · 24 in
54.9 cm · 21.6 in
17.5 cm · 6.9 in
24 cm · 9.4 in
Head sizes and heights: EasyCrochet hat size chart (upper value of each range). Slouchy hats: no negative ease and about 25 % more height.
CrochetMetrics · Cheat sheet #4
Standard Blanket Dimensions & Starting Chain Guide (Lovey to King Size)
Common blanket sizes and how many chains to start with at three typical single crochet gauges.
Blanket
in
cm
CYC 3 · 14.5 sc
CYC 4 · 12.5 sc
CYC 5 · 9.5 sc
Lovey
12 × 12 in
31 × 31 cm
45
39
30
Baby stroller
30 × 36 in
76 × 91 cm
111
96
73
Crib
45 × 60 in
114 × 152 cm
167
144
110
Throw
50 × 60 in
127 × 152 cm
185
160
122
Twin
66 × 90 in
168 × 229 cm
244
211
160
Queen
88 × 92 in
224 × 234 cm
325
280
213
King
104 × 92 in
264 × 234 cm
384
331
252
Starting chain = width × stitches per cm + 1 turning chain, using the midpoint of the CYC single crochet gauge range. Always check your own swatch.
Hook one or two sizes below the ball band for tight amigurumi fabric, and safety eye sizes by head width for three looks.
Yarn weight
Ball band hook
Amigurumi hook
1 – Super Fine
2.25–3.5 mm
2.25 mm
2 – Fine
3.5–4.5 mm
2.75–3.25 mm
3 – Light
4.5–5.5 mm
3.75–4 mm
4 – Medium
5.5–6.5 mm
4.5–5 mm
5 – Bulky
6.5–9 mm
5.5–6 mm
Head width
Subtle (1/8)
Balanced (1/6)
Kawaii (1/4)
4 cm
6 mm
6 mm
10 mm
5 cm
6 mm
8 mm
12 mm
6 cm
8 mm
10 mm
15 mm
8 cm
10 mm
14 mm
20 mm
10 cm
12 mm
16 mm
24 mm
12 cm
15 mm
20 mm
30 mm
15 cm
18 mm
24 mm
30 mm
Crocheted eye: yarn
Hook (mm)
Eye ⌀
Embroidery floss (5 strands)
2.25 mm
8 mm
Embroidery floss (6 strands)
2.25 mm
9 mm
Crochet thread #10
2.75 mm
10 mm
Sport / DK yarn
2.75 mm
12 mm
Worsted yarn
3.5 mm
15 mm
Eye sizes are proportions of the head width (1/8 subtle, 1/6 balanced, 1/4 kawaii) rounded to common safety eye sizes: a style guide, not a rule. Crocheted eyes: PlanetJune starting-point table. Safety eyes are not suitable for toys for children under 3.
CrochetMetrics · Cheat sheet #6
Stitch Yarn-Eater Multiplier Chart (Which stitches use the most yarn?)
How much yarn each stitch uses compared with double crochet (× 1.00) for the same fabric area.
Stitch
Abbr.
vs dc
30 × 30 cm (DK)
jasmine stitch
jasmine st
× 3.1
347 m
crocodile stitch
croc st
× 2.6
291 m
popcorn stitch
pc
× 2.5
280 m
puff stitch
puff
× 2.4
269 m
bobble stitch
bob
× 2.2
246 m
basketweave stitch
basketweave st
× 2
224 m
alpine stitch
alpine st
× 1.9
213 m
waffle stitch
waffle st
× 1.85
207 m
Elizabeth stitch (mini bean)
Elizabeth st
× 1.7
190 m
front post double crochet
FPdc
× 1.6
179 m
back post double crochet
BPdc
× 1.6
179 m
slip stitch
sl st
× 1.6
179 m
star stitch
star st
× 1.5
168 m
Catherine's wheel
CW
× 1.45
162 m
Tunisian simple stitch
Tss
× 1.45
162 m
waistcoat stitch
wst
× 1.4
157 m
cluster
cl
× 1.3
146 m
single crochet
sc
× 1.3
146 m
camel stitch
camel st
× 1.25
140 m
lemon peel stitch
lemon peel st
× 1.25
140 m
Suzette stitch
Suzette st
× 1.25
140 m
silt stitch
silt st
× 1.25
140 m
moss stitch
moss st
× 1.2
134 m
herringbone half double crochet
HBhdc
× 1.2
134 m
half double crochet
hdc
× 1.15
129 m
griddle stitch
griddle st
× 1.15
129 m
corner to corner (C2C)
C2C
× 1.05
118 m
double crochet
dc
× 1
112 m
shell stitch
sh
× 0.95
106 m
treble crochet
tr
× 0.9
101 m
granny stitch
granny st
× 0.9
101 m
double treble crochet
dtr
× 0.85
95 m
V-stitch
V-st
× 0.85
95 m
filet mesh
mesh
× 0.75
84 m
chain
ch
× 0.5
56 m
Multipliers from our calibrated yarn model. Swatch column: meters for a 30 × 30 cm piece in DK yarn (230 m per 100 g), without margin.