Diagram of a paper strip wrapped around a finger with a pencil marking the overlap point

Ring Size Measuring Guide

DANFÉE Guide · Sizing

Find your ring size in two simple ways, then match it to the size chart for your country.

How to measure your ring size

Use either the inside diameter of a ring that fits or your finger circumference. Keep these two measurements separate, then open the matching country or size-system row below.

Method 1: measure a ring you already own

Ring viewed from above with an arrow spanning the inner opening and guides aligned to a millimeter ruler
Measure straight across the inside opening. Exclude the metal edges. Example: 16.5 mm (0.650 in).
  1. Choose a ring that fits the same finger on the same hand.
  2. Lay it flat and measure across the widest part of its inside opening, from inner edge to inner edge.
  3. Match the result to the inside-diameter column in the appropriate country table.

Method 2: measure your finger with a paper strip

A paper strip wrapped around a finger with its overlap point marked
1. Wrap a narrow, non-stretch strip around the finger and mark the overlap.
A flattened paper strip aligned with zero on a millimeter ruler, showing the marked length
2. Flatten the strip and measure from zero to the mark. Example: 51.9 mm (2.043 in).
  1. Wrap a narrow strip of paper snugly around your finger, without pressing into the skin.
  2. Mark the overlap, then flatten the strip and measure from its starting end to the mark in millimeters.
  3. Use the inside-circumference column below. Check that the fit also allows the ring to pass over your knuckle.

Example: an inside diameter of about 16.5 mm (0.650 in), or a circumference of about 51.9 mm (2.043 in), corresponds to approximately US 6 / EU 52.

Repeat the measurement at a comfortable room temperature. Paper-strip measurements are approximate; confirm the final fit with a professional ring sizer, especially for wide bands or measurements between sizes. These drawings explain the method and are not printable or on-screen measuring tools. Click any diagram to enlarge.

Diagrams by DANFÉE. Measurement references: Tiffany & Co. and Cartier.

Ring sizes by country and size system

Choose the same country or size-system group as on the diamond-ring product page, then open its row below. The size labels follow the options offered by DANFÉE.

US / Canada measurements are shown in mm and inches. Europe uses mm. The UK / Australia / New Zealand, Italy / Spain, Japan, South Korea and Taiwan tables use mm and cm. Identical numbers in different systems do not necessarily indicate the same fit. Compare a ring with the inside-diameter column, or a paper-strip measurement with the inside-circumference column. Confirm the final size with a professional ring sizer.

United States / Canada

US and Canadian sizes use the same numerical scale. The product selector offers 3–13 in half-size steps.

US / Canada sizes 3–13
US / Canada size Approx. inside circumference (mm / in) Approx. inside diameter (mm / in)
3 44.2 mm / 1.740 in 14.1 mm / 0.555 in
3.5 45.5 mm / 1.791 in 14.5 mm / 0.571 in
4 46.8 mm / 1.843 in 14.9 mm / 0.587 in
4.5 48.0 mm / 1.890 in 15.3 mm / 0.602 in
5 49.3 mm / 1.941 in 15.7 mm / 0.618 in
5.5 50.6 mm / 1.992 in 16.1 mm / 0.634 in
6 51.9 mm / 2.043 in 16.5 mm / 0.650 in
6.5 53.1 mm / 2.091 in 16.9 mm / 0.665 in
7 54.4 mm / 2.142 in 17.3 mm / 0.681 in
7.5 55.7 mm / 2.193 in 17.7 mm / 0.697 in
8 57.0 mm / 2.244 in 18.1 mm / 0.713 in
8.5 58.3 mm / 2.295 in 18.5 mm / 0.728 in
9 59.5 mm / 2.343 in 18.9 mm / 0.744 in
9.5 60.8 mm / 2.394 in 19.4 mm / 0.764 in
10 62.1 mm / 2.445 in 19.8 mm / 0.780 in
10.5 63.4 mm / 2.496 in 20.2 mm / 0.795 in
11 64.6 mm / 2.543 in 20.6 mm / 0.811 in
11.5 65.9 mm / 2.594 in 21.0 mm / 0.827 in
12 67.2 mm / 2.646 in 21.4 mm / 0.843 in
12.5 68.5 mm / 2.697 in 21.8 mm / 0.858 in
13 69.7 mm / 2.744 in 22.2 mm / 0.874 in

Dimensions follow Tiffany & Co.; inch values are calculated (1 in = 25.4 mm). Confirm the final fit, especially for wide bands.

Europe — EU circumference sizes

In this EU circumference system, the size number represents the approximate inside circumference in millimeters. The product selector offers 44–74. Italy and Spain are listed separately below.

EU circumference sizes 44–74
EU size Approx. inside circumference (mm) Calculated inside diameter (mm)
44 44.0 mm 14.0 mm
45 45.0 mm 14.3 mm
46 46.0 mm 14.6 mm
47 47.0 mm 15.0 mm
48 48.0 mm 15.3 mm
49 49.0 mm 15.6 mm
50 50.0 mm 15.9 mm
51 51.0 mm 16.2 mm
52 52.0 mm 16.6 mm
53 53.0 mm 16.9 mm
54 54.0 mm 17.2 mm
55 55.0 mm 17.5 mm
56 56.0 mm 17.8 mm
57 57.0 mm 18.1 mm
58 58.0 mm 18.5 mm
59 59.0 mm 18.8 mm
60 60.0 mm 19.1 mm
61 61.0 mm 19.4 mm
62 62.0 mm 19.7 mm
63 63.0 mm 20.1 mm
64 64.0 mm 20.4 mm
65 65.0 mm 20.7 mm
66 66.0 mm 21.0 mm
67 67.0 mm 21.3 mm
68 68.0 mm 21.6 mm
69 69.0 mm 22.0 mm
70 70.0 mm 22.3 mm
71 71.0 mm 22.6 mm
72 72.0 mm 22.9 mm
73 73.0 mm 23.2 mm
74 74.0 mm 23.6 mm

Diameter is calculated as circumference ÷ π. Rounded dimensions are a guide; local conventions and product fit can vary.

United Kingdom / Australia / New Zealand

These countries commonly use letter sizes. Select the same group on the product page, then choose F–Z, including half sizes. Measurements below use millimeters and centimeters.

Letter sizes F–Z: approximate inside measurements
UK / Australia / New Zealand size Inside diameter (mm / cm) Inside circumference (mm / cm)
F 14.00 mm / 1.400 cm 44.0 mm / 4.398 cm
F½ 14.20 mm / 1.420 cm 44.6 mm / 4.461 cm
G 14.40 mm / 1.440 cm 45.2 mm / 4.524 cm
G½ 14.70 mm / 1.470 cm 46.2 mm / 4.618 cm
H 14.80 mm / 1.480 cm 46.5 mm / 4.650 cm
H½ 15.00 mm / 1.500 cm 47.1 mm / 4.712 cm
I 15.26 mm / 1.526 cm 47.9 mm / 4.794 cm
I½ 15.35 mm / 1.535 cm 48.2 mm / 4.822 cm
J 15.62 mm / 1.562 cm 49.1 mm / 4.907 cm
J½ 15.90 mm / 1.590 cm 50.0 mm / 4.995 cm
K 16.00 mm / 1.600 cm 50.3 mm / 5.027 cm
K½ 16.30 mm / 1.630 cm 51.2 mm / 5.121 cm
L 16.44 mm / 1.644 cm 51.6 mm / 5.165 cm
L½ 16.60 mm / 1.660 cm 52.2 mm / 5.215 cm
M 16.80 mm / 1.680 cm 52.8 mm / 5.278 cm
M½ 17.00 mm / 1.700 cm 53.4 mm / 5.341 cm
N 17.18 mm / 1.718 cm 54.0 mm / 5.397 cm
N½ 17.40 mm / 1.740 cm 54.7 mm / 5.466 cm
O 17.55 mm / 1.755 cm 55.1 mm / 5.513 cm
O½ 17.80 mm / 1.780 cm 55.9 mm / 5.592 cm
P 18.00 mm / 1.800 cm 56.5 mm / 5.655 cm
P½ 18.20 mm / 1.820 cm 57.2 mm / 5.718 cm
Q 18.30 mm / 1.830 cm 57.5 mm / 5.749 cm
Q½ 18.60 mm / 1.860 cm 58.4 mm / 5.843 cm
R 18.80 mm / 1.880 cm 59.1 mm / 5.906 cm
R½ 19.00 mm / 1.900 cm 59.7 mm / 5.969 cm
S 19.20 mm / 1.920 cm 60.3 mm / 6.032 cm
S½ 19.40 mm / 1.940 cm 60.9 mm / 6.095 cm
T 19.60 mm / 1.960 cm 61.6 mm / 6.158 cm
T½ 19.80 mm / 1.980 cm 62.2 mm / 6.220 cm
U 20.10 mm / 2.010 cm 63.1 mm / 6.315 cm
U½ 20.20 mm / 2.020 cm 63.5 mm / 6.346 cm
V 20.40 mm / 2.040 cm 64.1 mm / 6.409 cm
V½ 20.60 mm / 2.060 cm 64.7 mm / 6.472 cm
W 20.80 mm / 2.080 cm 65.3 mm / 6.535 cm
W½ 21.00 mm / 2.100 cm 66.0 mm / 6.597 cm
X 21.10 mm / 2.110 cm 66.3 mm / 6.629 cm
X½ 21.40 mm / 2.140 cm 67.2 mm / 6.723 cm
Y 21.50 mm / 2.150 cm 67.5 mm / 6.754 cm
Y½ 21.70 mm / 2.170 cm 68.2 mm / 6.817 cm
Z 21.90 mm / 2.190 cm 68.8 mm / 6.880 cm

All values are approximate. Circumference is calculated from nominal diameter using π; centimeters are converted from millimeters (1 cm = 10 mm). On mobile, swipe the table horizontally to see all columns. Diameter reference: Michael Hill Australia / New Zealand. Letter-size measurements can differ slightly between brands and measuring tools; confirm your letter size and measured dimensions before ordering.

Italy / Spain

Choose Italy / Spain on the product page, then select 4–34. This reference uses the common local numerical convention: inside circumference (mm) = local size + 40. For example, local size 12 corresponds to 52 mm (5.200 cm), approximately EU 52.

Italy / Spain sizes 4–34: approximate inside measurements
Italy / Spain size Inside diameter (mm / cm) Inside circumference (mm / cm)
4 14.01 mm / 1.401 cm 44.0 mm / 4.400 cm
5 14.32 mm / 1.432 cm 45.0 mm / 4.500 cm
6 14.64 mm / 1.464 cm 46.0 mm / 4.600 cm
7 14.96 mm / 1.496 cm 47.0 mm / 4.700 cm
8 15.28 mm / 1.528 cm 48.0 mm / 4.800 cm
9 15.60 mm / 1.560 cm 49.0 mm / 4.900 cm
10 15.92 mm / 1.592 cm 50.0 mm / 5.000 cm
11 16.23 mm / 1.623 cm 51.0 mm / 5.100 cm
12 16.55 mm / 1.655 cm 52.0 mm / 5.200 cm
13 16.87 mm / 1.687 cm 53.0 mm / 5.300 cm
14 17.19 mm / 1.719 cm 54.0 mm / 5.400 cm
15 17.51 mm / 1.751 cm 55.0 mm / 5.500 cm
16 17.83 mm / 1.783 cm 56.0 mm / 5.600 cm
17 18.14 mm / 1.814 cm 57.0 mm / 5.700 cm
18 18.46 mm / 1.846 cm 58.0 mm / 5.800 cm
19 18.78 mm / 1.878 cm 59.0 mm / 5.900 cm
20 19.10 mm / 1.910 cm 60.0 mm / 6.000 cm
21 19.42 mm / 1.942 cm 61.0 mm / 6.100 cm
22 19.74 mm / 1.974 cm 62.0 mm / 6.200 cm
23 20.05 mm / 2.005 cm 63.0 mm / 6.300 cm
24 20.37 mm / 2.037 cm 64.0 mm / 6.400 cm
25 20.69 mm / 2.069 cm 65.0 mm / 6.500 cm
26 21.01 mm / 2.101 cm 66.0 mm / 6.600 cm
27 21.33 mm / 2.133 cm 67.0 mm / 6.700 cm
28 21.65 mm / 2.165 cm 68.0 mm / 6.800 cm
29 21.96 mm / 2.196 cm 69.0 mm / 6.900 cm
30 22.28 mm / 2.228 cm 70.0 mm / 7.000 cm
31 22.60 mm / 2.260 cm 71.0 mm / 7.100 cm
32 22.92 mm / 2.292 cm 72.0 mm / 7.200 cm
33 23.24 mm / 2.324 cm 73.0 mm / 7.300 cm
34 23.55 mm / 2.355 cm 74.0 mm / 7.400 cm

Diameter is calculated as circumference ÷ π; 1 cm = 10 mm. References: NUGAE Italian conversion guide and TOUS Spain ring size guide. Brands and measuring tools can vary; confirm the final fit. On mobile, swipe horizontally to see all columns.

Japan

Choose Japan on the product page. This common numerical reference starts at an inside diameter of 13 mm for size 1, increasing by approximately one-third of a millimeter per size.

Japan sizes 1–30: approximate inside measurements
Japan size Inside diameter (mm / cm) Inside circumference (mm / cm)
1 13.00 mm / 1.300 cm 40.8 mm / 4.084 cm
2 13.33 mm / 1.333 cm 41.9 mm / 4.189 cm
3 13.67 mm / 1.367 cm 42.9 mm / 4.294 cm
4 14.00 mm / 1.400 cm 44.0 mm / 4.398 cm
5 14.33 mm / 1.433 cm 45.0 mm / 4.503 cm
6 14.67 mm / 1.467 cm 46.1 mm / 4.608 cm
7 15.00 mm / 1.500 cm 47.1 mm / 4.712 cm
8 15.33 mm / 1.533 cm 48.2 mm / 4.817 cm
9 15.67 mm / 1.567 cm 49.2 mm / 4.922 cm
10 16.00 mm / 1.600 cm 50.3 mm / 5.027 cm
11 16.33 mm / 1.633 cm 51.3 mm / 5.131 cm
12 16.67 mm / 1.667 cm 52.4 mm / 5.236 cm
13 17.00 mm / 1.700 cm 53.4 mm / 5.341 cm
14 17.33 mm / 1.733 cm 54.5 mm / 5.445 cm
15 17.67 mm / 1.767 cm 55.5 mm / 5.550 cm
16 18.00 mm / 1.800 cm 56.5 mm / 5.655 cm
17 18.33 mm / 1.833 cm 57.6 mm / 5.760 cm
18 18.67 mm / 1.867 cm 58.6 mm / 5.864 cm
19 19.00 mm / 1.900 cm 59.7 mm / 5.969 cm
20 19.33 mm / 1.933 cm 60.7 mm / 6.074 cm
21 19.67 mm / 1.967 cm 61.8 mm / 6.178 cm
22 20.00 mm / 2.000 cm 62.8 mm / 6.283 cm
23 20.33 mm / 2.033 cm 63.9 mm / 6.388 cm
24 20.67 mm / 2.067 cm 64.9 mm / 6.493 cm
25 21.00 mm / 2.100 cm 66.0 mm / 6.597 cm
26 21.33 mm / 2.133 cm 67.0 mm / 6.702 cm
27 21.67 mm / 2.167 cm 68.1 mm / 6.807 cm
28 22.00 mm / 2.200 cm 69.1 mm / 6.912 cm
29 22.33 mm / 2.233 cm 70.2 mm / 7.016 cm
30 22.67 mm / 2.267 cm 71.2 mm / 7.121 cm

All values are approximate. Circumference is calculated from nominal diameter using π; centimeters are converted from millimeters (1 cm = 10 mm). On mobile, swipe the table horizontally to see all columns. Reference: I-PRIMO size guide. Small rounding differences between charts are normal; confirm your measured dimensions and final fit.

South Korea

Choose Korea on the product page. This reference follows the nominal inside-diameter progression shown in Korean KS guides: 13 mm at size 1, increasing by approximately one-third of a millimeter per size.

South Korea sizes 1–30: approximate inside measurements
South Korea size Inside diameter (mm / cm) Inside circumference (mm / cm)
1 13.00 mm / 1.300 cm 40.8 mm / 4.084 cm
2 13.33 mm / 1.333 cm 41.9 mm / 4.189 cm
3 13.67 mm / 1.367 cm 42.9 mm / 4.294 cm
4 14.00 mm / 1.400 cm 44.0 mm / 4.398 cm
5 14.33 mm / 1.433 cm 45.0 mm / 4.503 cm
6 14.67 mm / 1.467 cm 46.1 mm / 4.608 cm
7 15.00 mm / 1.500 cm 47.1 mm / 4.712 cm
8 15.33 mm / 1.533 cm 48.2 mm / 4.817 cm
9 15.67 mm / 1.567 cm 49.2 mm / 4.922 cm
10 16.00 mm / 1.600 cm 50.3 mm / 5.027 cm
11 16.33 mm / 1.633 cm 51.3 mm / 5.131 cm
12 16.67 mm / 1.667 cm 52.4 mm / 5.236 cm
13 17.00 mm / 1.700 cm 53.4 mm / 5.341 cm
14 17.33 mm / 1.733 cm 54.5 mm / 5.445 cm
15 17.67 mm / 1.767 cm 55.5 mm / 5.550 cm
16 18.00 mm / 1.800 cm 56.5 mm / 5.655 cm
17 18.33 mm / 1.833 cm 57.6 mm / 5.760 cm
18 18.67 mm / 1.867 cm 58.6 mm / 5.864 cm
19 19.00 mm / 1.900 cm 59.7 mm / 5.969 cm
20 19.33 mm / 1.933 cm 60.7 mm / 6.074 cm
21 19.67 mm / 1.967 cm 61.8 mm / 6.178 cm
22 20.00 mm / 2.000 cm 62.8 mm / 6.283 cm
23 20.33 mm / 2.033 cm 63.9 mm / 6.388 cm
24 20.67 mm / 2.067 cm 64.9 mm / 6.493 cm
25 21.00 mm / 2.100 cm 66.0 mm / 6.597 cm
26 21.33 mm / 2.133 cm 67.0 mm / 6.702 cm
27 21.67 mm / 2.167 cm 68.1 mm / 6.807 cm
28 22.00 mm / 2.200 cm 69.1 mm / 6.912 cm
29 22.33 mm / 2.233 cm 70.2 mm / 7.016 cm
30 22.67 mm / 2.267 cm 71.2 mm / 7.121 cm

All values are approximate. Circumference is calculated from nominal diameter using π; centimeters are converted from millimeters (1 cm = 10 mm). On mobile, swipe the table horizontally to see all columns. These are ring inner dimensions, not the separate finger-circumference values in some Korean measuring guides. If you used a Korean ring gauge, confirm its sizing convention before ordering. Reference: Five & Plus KS size guide.

Taiwan

Choose Taiwan on the product page. This table uses the common Taiwan international-size convention: nominal inside diameter (mm) = 11 + 0.5 × size. This local convention differs from ISO / EU circumference sizing.

Taiwan sizes 1–30: approximate international-size reference
Taiwan size Inside diameter (mm / cm) Inside circumference (mm / cm)
1 11.50 mm / 1.150 cm 36.1 mm / 3.613 cm
2 12.00 mm / 1.200 cm 37.7 mm / 3.770 cm
3 12.50 mm / 1.250 cm 39.3 mm / 3.927 cm
4 13.00 mm / 1.300 cm 40.8 mm / 4.084 cm
5 13.50 mm / 1.350 cm 42.4 mm / 4.241 cm
6 14.00 mm / 1.400 cm 44.0 mm / 4.398 cm
7 14.50 mm / 1.450 cm 45.6 mm / 4.555 cm
8 15.00 mm / 1.500 cm 47.1 mm / 4.712 cm
9 15.50 mm / 1.550 cm 48.7 mm / 4.869 cm
10 16.00 mm / 1.600 cm 50.3 mm / 5.027 cm
11 16.50 mm / 1.650 cm 51.8 mm / 5.184 cm
12 17.00 mm / 1.700 cm 53.4 mm / 5.341 cm
13 17.50 mm / 1.750 cm 55.0 mm / 5.498 cm
14 18.00 mm / 1.800 cm 56.5 mm / 5.655 cm
15 18.50 mm / 1.850 cm 58.1 mm / 5.812 cm
16 19.00 mm / 1.900 cm 59.7 mm / 5.969 cm
17 19.50 mm / 1.950 cm 61.3 mm / 6.126 cm
18 20.00 mm / 2.000 cm 62.8 mm / 6.283 cm
19 20.50 mm / 2.050 cm 64.4 mm / 6.440 cm
20 21.00 mm / 2.100 cm 66.0 mm / 6.597 cm
21 21.50 mm / 2.150 cm 67.5 mm / 6.754 cm
22 22.00 mm / 2.200 cm 69.1 mm / 6.912 cm
23 22.50 mm / 2.250 cm 70.7 mm / 7.069 cm
24 23.00 mm / 2.300 cm 72.3 mm / 7.226 cm
25 23.50 mm / 2.350 cm 73.8 mm / 7.383 cm
26 24.00 mm / 2.400 cm 75.4 mm / 7.540 cm
27 24.50 mm / 2.450 cm 77.0 mm / 7.697 cm
28 25.00 mm / 2.500 cm 78.5 mm / 7.854 cm
29 25.50 mm / 2.550 cm 80.1 mm / 8.011 cm
30 26.00 mm / 2.600 cm 81.7 mm / 8.168 cm

All values are approximate. Circumference is calculated from nominal diameter using π; centimeters are converted from millimeters (1 cm = 10 mm). On mobile, swipe the table horizontally to see all columns. Taiwan retailers may use other charts or Japanese sizes. Sizes 25–30 extend the same nominal diameter convention; confirm larger sizes and measured dimensions with DANFÉE before ordering. References: Jfull Taiwan size guide and ALUXE conversion guide.

Found your size?

Choose the same country or size-system group on the product page, then select your size.

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