Ring Size Guide

Tools for measuring ring size on a table

It’s important to get a ring that is sized correctly for the finger you plan to wear it on. If your ring is too large it could slide around, wear out your skin, or even fall off and get lost. If your ring is too small, it will be painful to wear and could even cause permanent damage to your finger. Going to a professional or knowing how to measure your ring size at home can help you avoid both types of mishaps.

Standardized Ring Sizes Help Solve This Problem

To ensure that people’s rings fit correctly, jewelers from all around the world use a standardized ring size chart with various US, EU, and other sizes.

Our sizing at Capucinne is in US ring size. This means you should measure your ring size using the US ring size guide when you order wedding rings or engagement rings with us. If you are used to using the measuring systems of different countries, see our international ring size conversion chart at the bottom of this guide.

How to Measure Ring Size at Home

There are several different ways of determining your ring size. The most reliable method is to pay a visit to your local jeweler and get your finger professionally sized. If you plan to order fine jewelry, this is a step we highly recommend.

However, you can also measure it yourself. Here are our suggestions for doing it at home!

Method 1: How to Measure Ring Size at Home Using an Existing Ring

Measure the inner diameter of a ring you already own that comfortably fits the finger you plan to wear your new ring on. The “inner diameter” just means the diameter as measured from the inside of the ring rather than the outside, like in this picture:

Someone measuring the inside diameter of a ring with a ruler in millimeters

Be sure to use the metric/millimeter side of your measuring tape or ruler!

This method comes in handy when you are buying a ring for your loved one and do not want to ruin the surprise. It’s also the easier option for those who have issues with fine motor control in their hands, which can make it difficult to take tiny measurements accurately.

Method 2: How to Measure Ring Size at Home Directly

The more precise option for measuring ring size at home is to directly measure your finger using a measuring tape.

Use a flexible measuring tape (often called tailor’s tape, cloth tape, or sewing tape) that can wrap around your finger. If you don't have a clothing measuring tape, then a piece of string or dental floss will do. Just wrap it around the base of the finger, then straighten it back out and measure that against a flat ruler. That’s how to measure ring size at home!

Make sure you do not wrap the measuring tape, string, or floss too tightly. The fit should be loose but with no slack. Also be sure to consider your knuckles when you measure, as the knuckle joints are often the largest parts of a finger. To do this properly, take your measurement at the part of your finger where the side of the ring closest to the nearest knuckle is going to sit. The most convenient option is to measure with the tape facing the second (middle) knuckle, as shown below:

 A person showing how to measure ring size at home using your finger circumference and a measuring tape.

How to Measure Ring Size at Home: Additional Factors to Consider

Several factors can complicate the measuring process.

Fingers Change Size

Your ring size changes slightly over the year, as your finger might swell in summer and shrink in winter. The change can also be noticeable throughout the day because the fingers tend to be thinner in the morning. You should measure your ring size at the end of the day and when your hands are warm.

If You Are Between Sizes

If you are between sizes and want advice on how to measure ring size at home, the safest option would be to order up to the next highest size.

Fingers often swell as we get older, increasing your ring size. It’s also easier for most people to wear a ring that’s just a touch too loose than one that’s just a touch too tight. Plus, there is the option of using inexpensive sizing beads if a ring is too loose—whereas if a ring is too tight, there is no way to fix it other than a resizing.

If You Want a Wide Ring or Multi-Piece Stacked Rings

When you’re thinking about how to measure ring size at home accurately, make sure you take the size and number of rings into consideration.

For wider rings or sets of three stacked rings, ordering a slightly larger size is recommended (up to ½ US). This is because narrower rings allow the skin to move more naturally, whereas rings that are 5mm and wider, as well as multiple rings stacked together, can feel a bit tight around the finger and leave a mark when you take them off.

Don’t Go with the Same Measurement from Your Other Hand

Please keep in mind that the same fingers on the opposite hand may have a different ring size.

Consider the Design of the Band

When ordering a new ring, it is also important that you consider the band’s design. Most simple gold bands can be resized, but for more elaborate designs this is not always possible.

For example, rings with a textured design or full eternity band cannot be resized and will require a complete remake. When you’re thinking about how to measure ring size at home, it’s especially important to get an accurate measurement for rings like these.

Similarly, some bands with gemstones can only be resized a little. Bending the ring excessively could cause the prong setting to loosen up, which might result in stones falling out.

US Ring Size Guide & International Ring Size Conversion Chart

Once you have taken accurate measurements, the final step is to determine your ring size using our helpful chart below.

Inside Diameter  Inside Circumference Sizes
MM Inches MM Inches British & Australian  US & Canada French & Russian German Japanese Swiss
9.91 0.390 31.13 1.22 - 0 - - - -
10.72 0.442 33.68 1.39 - 0 - - - -
11.53 0.454 36.22 1.43 - 0 - - - -
11.95 0.474 37.54 1.49 A - - - - -
12.18 0.482 38.26 1.51 A 1/2 - - - - -
12.37 0.487 38.86 1.53 B 1 - - 1 -
12.60 0.496 39.58 1.56 B 1/2 1 1/4 - - - -
12.78 0.503 40.15 1.58 C 1 1/2 - - - -
13.00 0.512 40.84 1.61 C 1/2 1 3/4 - - - -
13.21 0.520 41.50 1.63 D 2 41 1/2 13 1/2 2 1 1/2
13.41 0.528 42.13 1.66 D 1/2 2 1/4 - - - -
13.61 0.536 42.76 1.68 E 2 1/2 42 3/4 13 3/4 3 2 3/4
13.83 0.544 43.45 1.71 E 1/2 2 3/4 - - - -
14.05 0.553 44.14 1.74 F 3 44 14 4 4
14.15 0.557 44.45 1.75 F 1/2 3 1/8 - - - -
14.25 0.561 44.77 1.76 F 3/4 3 1/4 - - - -
14.36 0.565 45.11 1.77 G 3 3/8 45 1/4 - 5 5 1/4
14.45 0.569 45.40 1.79 G 1/4 3 1/2 - 14 1/2 - -
14.56 0.573 45.74 1.80 G 1/2 3 5/8 - - 6 -
14.65 0.577 46.02 1.81 H 3 3/4 46 1/2 - - 6 1/2
14.86 0.585 46.68 1.84 H 1/2 4 - 15 7 -
15.04 0.592 47.25 1.86 I 4 1/4 47 3/4 - - 7 3/4
15.27 0.601 47.97 1.89 I 1/2 4 1/2 - 15 1/4 8 -
15.40 0.606 48.38 1.90 J 4 5/8 49 15 1/2 - 9
15.53 0.611 48.79 1.92 J 1/4 4 3/4 - - - -
15.70 0.618 49.32 1.94 J 1/2 5 - 15 3/4 9 -
15.80 0.622 49.64 1.95 K 5 1/8 50 - - 10
15.90 0.626 49.95 1.97 K 1/4 5 1/4 - - - -
16.00 0.630 50.27 1.98 K 1/2 5 3/8 - - 10 -
16.10 0.634 50.58 1.99 L 5 1/2 51 3/4 16 - 11 3/4
16.30 0.642 51.21 2.02 L 1/4 5 3/4 - - - -
16.41 0.646 51.55 2.03 L 1/2 5 7/8 - - - -
16.51 0.650 51.87 2.04 M 6 52 3/4 16 1/2 12 12 3/4
16.71 0.658 52.50 2.07 M 1/2 6 1/4 - - - -
16.92 0.666 53.16 2.09 N 6 1/2 54 17 13 14
17.13 0.674 53.82 2.12 N 1/2 6 3/4 - - - -
17.35 0.683 54.51 2.15 O 7 55 1/4 17 1/4 14 15 1/4
17.45 0.687 54.82 2.16 O 1/2 7 1/4 - - - -
17.75 0.699 55.76 2.20 P 7 1/2 56 1/2 17 3/4 15 16 1/2
17.97 0.707 56.45 2.22 P 1/2 7 3/4 - - - -
18.19 0.716 57.15 2.25 Q 8 57 3/4 18 16 17 3/4
18.35 0.722 57.65 2.27 Q 1/2 8 1/4 - - - -
18.53 0.729 58.21 2.29 Q 3/4 8 1/2 - 18 1/2 17 -
18.61 0.733 58.47 2.30 R 8 5/8 59 - - 19
18.69 0.736 58.72 2.31 R 1/4 8 3/4 - - - -
18.80 0.740 59.06 2.32 R 1/2 8 7/8 - - - -
18.89 0.748 59.34 2.35 R 3/4 9 - 19 18 -
19.10 0.752 60.00 2.36 S 9 1/8 60 1/4 - - 20 1/4
19.22 0.757 60.38 2.38 S 1/4 9 1/4 - - - -
19.31 0.760 60.66 2.39 S 1/2 9 3/8 - - - -
19.41 0.764 60.98 2.40 S 3/4 9 1/2 - 19 1/2 19 -
19.51 0.768 61.29 2.41 T 9 5/8 61 1/2 - - 21 1/2
19.62 0.772 61.64 2.43 T 1/4 9 3/4 - - - -
19.84 0.781 62.33 2.45 T 1/2 10 - 20 20 -
20.02 0.788 62.89 2.48 U 10 1/4 62 3/4 - 21 22 3/4
20.20 0.797 63.46 2.50 U 1/2 10 1/2 - 20 1/4 22 -
20.32 0.800 63.84 2.51 V 10 5/8 63 - - 23 3/4
20.44 0.805 64.21 2.53 V 1/4 10 3/4 - - - -
20.68 0.814 64.97 2.56 V 1/2 11 - 20 3/4 23 -
20.76 0.817 65.22 2.57 W 11 1/8 65 - - 25
20.85 0.821 65.50 2.58 W 1/4 11 1/4 - - - -
20.94 0.824 65.78 2.59 W 1/2 11 3/8 - - - -
21.08 0.830 66.22 2.61 W 3/4 11 1/2 - 21 24 -
21.18 0.834 66.54 2.62 X 11 5/8 66 1/4 - - 26 1/4
21.24 0.836 66.73 2.63 X 1/4 11 3/4 - - - -
21.30 0.839 66.92 2.64 X 1/2 11 7/8 - - - -
21.49 0.846 67.51 2.66 Y 12 67 1/2 21 1/4 25 27 1/2
21.69 0.854 68.14 2.68 Y 1/2 12 1/4 - - - -
21.89 0.862 68.77 2.71 Z 12 1/2 68 3/4 21 3/4 26 28 3/4
22.10 0.870 69.43 2.73 Z +1/2 12 3/4 - - - -
22.33 0.879 70.15 2.76 Z+1 13 - 22 27 -
22.60 0.89 71.00 2.80 Z+1.5 13.5 - - - -

This One Counts, So Make Sure Your Measurement Is Accurate!

To avoid potential resizing or remaking fees, please take your time to find out your correct ring size. If you’re not sure about how to measure ring size at home accurately, go get a professional measurement at a nearby jeweler. This article is only a guide and we cannot be held responsible if the size you ordered doesn’t fit. Capucinne only uses US sizes.


If you have any more questions regarding how to measure ring size at home or about our US ring size guide and international ring size conversion chart, please contact us.



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