Ring Size Calculator

Ring Size Calculator

Ring Size Calculator

Here's an expanded table with 100 popular ring sizes based on finger circumference and diameter:

Finger Circumference (mm)Ring Size
38-401
41-432
44-463
47-494
50-525
53-556
56-587
59-618
62-649
65-6710
68-7011
71-7312
74-7613
77-7914
80-8215
83-8516
86-8817
89-9118
92-9419
95-9720
98-10021
101-10322
104-10623
107-10924
110-11225
113-11526
116-11827
119-12128
122-12429
125-12730
128-13031
131-13332
134-13633
137-13934
140-14235
143-14536
146-14837
149-15138
152-15439
155-15740
158-16041
161-16342
164-16643
167-16944
170-17245
173-17546
176-17847
179-18148
182-18449
185-18750
188-19051
191-19352
194-19653
197-19954
200-20255
203-20556
206-20857
209-21158
212-21459
215-21760
218-22061
221-22362
224-22663
227-22964
230-23265
233-23566
236-23867
239-24168
242-24469
245-24770
248-25071
251-25372
254-25673
257-25974
260-26275
263-26576
266-26877
269-27178
272-27479
275-27780
278-28081
281-28382
284-28683
287-28984
290-29285
293-29586
296-29887
299-30188
302-30489
305-30790
Finger Diameter (mm)Ring Size
10.0-10.41
10.5-10.92
11.0-11.43
11.5-11.94
12.0-12.45
12.5-12.96
13.0-13.47
13.5-13.98
14.0-14.49
14.5-14.910
15.0-15.411
15.5-15.912
16.0-16.413
16.5-16.914
17.0-17.415
17.5-17.916
18.0-18.417
18.5-18.918
19.0-19.419
19.5-19.920
20.0-20.421
20.5-20.922
21.0-21.423
21.5-21.924
22.0-22.425
22.5-22.926
23.0-23.427
23.5-23.928
24.0-24.429
24.5-24.930
25.0-25.431
25.5-25.932
26.0-26.433
26.5-26.934
27.0-27.435
27.5-27.936
28.0-28.437
28.5-28.938
29.0-29.439
29.5-29.940
30.0-30.441
30.5-30.942
31.0-31.443
31.5-31.944
32.0-32.445
32.5-32.946
33.0-33.447
33.5-33.948
34.0-34.449
34.5-34.950
35.0-35.451
35.5-35.952
36.0-36.453
36.5-36.954
37.0-37.455
37.5-37.956
38.0-38.457
38.5-38.958
39.0-39.459
39.5-39.960
40.0-40.461
40.5-40.962
41.0-41.463
41.5-41.964
42.0-42.465
42.5-42.966
43.0-43.467
43.5-43.968
44.0-44.469
44.5-44.970
45.0-45.471
45.5-45.972
46.0-46.473
46.5-46.974
47.0-47.475
47.5-47.976
48.0-48.477
48.5-48.978
49.0-49.479
49.5-49.980
50.0-50.481
50.5-50.982
51.0-51.483
51.5-51.984

How do I calculate ring size?

To calculate ring size, you can measure either the finger circumference or diameter. For circumference, wrap a string around the base of the finger, mark the overlap point, and measure it. For diameter, measure the inside of a well-fitting ring. Use these measurements with a ring size chart or consult a jeweler for accurate sizing.


To calculate ring size, you can follow two common approaches: measuring the finger circumference or measuring the finger diameter. Here are the steps for each method:

  1. Measuring Finger Circumference:
    • Wrap a string or a strip of paper around the base of the finger where the ring will sit.
    • Mark the point where the string/paper overlaps.
    • Measure the length of the string/paper using a ruler in millimeters (mm).
    • Use the measurement to determine the ring size using a ring size chart or the formula.
  2. Measuring Finger Diameter:
    • Take a ring that fits comfortably on the same finger you want to measure.
    • Place the ring on a ruler and measure the inside diameter in millimeters (mm).
    • Use the measurement to determine the ring size using a ring size chart or the formula.
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Ring size charts are readily available online or at jewelry stores and provide a correlation between the measured circumference/diameter and the corresponding ring size. Additionally, jewelers can also measure your ring size accurately using professional tools.

It's important to note that different countries may use different sizing systems, so it's advisable to refer to a ring size chart specific to your region or consult with a professional jeweler for the most accurate measurement.

What ring size is 2 inches?

A ring size of 2 inches is not a standard measurement used for determining ring sizes. Ring sizes are typically measured in millimeters or a numerical scale. To determine the appropriate ring size, it's recommended to convert the measurement to millimeters or consult a jeweler who can accurately measure your finger and provide the corresponding ring size.


To determine the ring size for a measurement of 2 inches, we need to convert the measurement to millimeters (mm) since ring sizes are typically measured in millimeters.

1 inch is approximately equal to 25.4 millimeters. Therefore, 2 inches would be 2 * 25.4 = 50.8 millimeters.

Based on the average ring size chart, a measurement of 50.8 millimeters corresponds to approximately ring size 5.5 or 6, depending on the specific conversion chart or sizing system used. Keep in mind that ring sizes can vary slightly depending on the region or sizing conventions. It is advisable to consult a jeweler or use a ring sizer for the most accurate measurement.

How big is a size 7 ring?

A size 7 ring typically has a diameter of approximately 17.3-17.7 mm or a circumference of around 54.4-55.7 mm. Ring sizes can vary slightly depending on the region or sizing conventions, so it's always best to consult a jeweler or use a ring sizer to ensure an accurate measurement for a size 7 ring.

How can I measure my ring size without a ring sizer?


If you don't have a ring sizer, there are a few alternative methods you can try to measure your ring size:

  1. String or Paper Method:
    • Wrap a thin strip of paper or string around the base of your finger.
    • Mark the point where the paper or string overlaps.
    • Measure the length of the paper or string using a ruler in millimeters (mm).
    • Use a ring size chart or consult a jeweler to determine your ring size based on the measured length.
  2. Existing Ring Comparison:
    • If you already have a ring that fits the finger you want to measure, place it on a ruler and measure the inside diameter in millimeters.
    • Use a ring size conversion chart or consult a jeweler to find your corresponding ring size based on the measured diameter.
  3. Printable Ring Sizer:
    • Search online for printable ring sizer templates.
    • Print out the template and follow the instructions provided to measure your ring size accurately.
  4. Visit a Jewelry Store:
    • Visit a local jewelry store and ask if they can measure your ring size.
    • Jewelers typically have professional ring sizers and can assist you in determining the correct size.
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Remember, these methods provide approximate measurements and may not be as precise as using a dedicated ring sizer. For the most accurate measurement, it's recommended to consult a jeweler or use a physical ring sizer tool.

Can I measure my ring size on my phone?


Yes, it is possible to measure your ring size using your phone. There are certain mobile applications available that utilize augmented reality (AR) or virtual reality (VR) technology to measure your finger and provide an estimated ring size. These apps typically require you to place your finger on the screen or use a reference object for size calibration.

You can search for "ring size measurement" or "ring sizer" apps in your mobile app store to find suitable options. However, it's important to note that the accuracy of these apps may vary, and they may not be as precise as using a physical ring sizer or visiting a jeweler. It's advisable to use these apps as a general guide and consider getting a professional measurement for the most accurate ring size determination.

Is your ring size the same as your shoe size?

No, your ring size and shoe size are not related or interchangeable. Ring size is a measurement specific to your finger, typically measured in millimeters or using a numerical scale. Shoe size, on the other hand, is a measurement specific to your foot, typically measured in different sizing systems such as US, UK, or European sizes.

The size of your finger and foot can vary independently, so there is no direct correlation between your ring size and shoe size. It's important to measure each separately when determining the appropriate ring or shoe size for your needs.

What ring size am I if my finger is 3 inches?


If your finger measures 3 inches, it is recommended to convert that measurement to millimeters since ring sizes are typically measured in millimeters.

1 inch is approximately equal to 25.4 millimeters. Therefore, 3 inches would be 3 * 25.4 = 76.2 millimeters.

Based on the average ring size chart, a measurement of 76.2 millimeters corresponds to a larger ring size, typically ranging from size 13 to size 14. However, ring sizes can vary slightly depending on the region or sizing conventions. It is advisable to consult a jeweler or use a ring sizer for the most accurate measurement and determination of your ring size.

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What size ring am I if my finger is 2.5 inches?


If your finger measures 2.5 inches, it's recommended to convert that measurement to millimeters since ring sizes are typically measured in millimeters.

1 inch is approximately equal to 25.4 millimeters. Therefore, 2.5 inches would be 2.5 * 25.4 = 63.5 millimeters.

Based on the average ring size chart, a measurement of 63.5 millimeters corresponds to a ring size of approximately 10 or 10.5, depending on the specific conversion chart or sizing system used. However, it's always best to consult a jeweler or use a ring sizer for the most accurate measurement and determination of your ring size.

How big is a size 9 ring?

A size 9 ring typically has a diameter of approximately 18.89 mm or a circumference of around 59.34 mm. It's important to note that ring sizes can vary slightly depending on the region or sizing conventions, so it's always best to consult a jeweler or use a ring sizer for the most accurate measurement.

What is the average ring size for a woman?

The average ring size for women can vary depending on factors such as region and population. In the United States, the average ring size for women is typically between size 6 and size 7. However, it's important to note that individual ring sizes can vary significantly based on factors such as genetics, body type, and personal preferences. When purchasing a ring, it is recommended to measure the specific finger intended for the ring to ensure the best fit.

What is a small ring size for a woman?

A small ring size for a woman typically falls below the average range, which is typically between size 6 and size 7 in the United States. Sizes smaller than 5 or 5.5 are generally considered small for women. However, it's important to note that ring size can vary significantly between individuals, and what may be considered small for one person might be average or even large for another. It's best to measure the specific finger intended for the ring to determine the most accurate size.

Is a size 8 ring big for a woman?

A size 8 ring is generally considered above average for a woman in terms of ring size. In the United States, the average ring size for women typically falls between size 6 and size 7. Therefore, a size 8 ring would be larger than the average. However, it's important to note that ring size can vary significantly between individuals, and personal preferences for fit may also differ. It's best to try on different ring sizes or consult a jeweler to find the most comfortable and suitable fit for an individual.

How do I find out my girlfriend's ring size without asking?


Finding out your girlfriend's ring size without asking directly can be a bit tricky. Here are a few subtle ways to gather information:

  1. Borrow one of her rings and have it measured at a jeweler.
  2. Enlist the help of her close friends or family members who might know her ring size.
  3. Use a printable ring size chart and compare it to one of her existing rings.
  4. Guess a size and have the ring resized later if needed.

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