# Ring Size Calculator + How to Measure Ring Sizes at Home + Charts

Find your or someone elses ring size in seconds. Use our easy ring size calculator, our how-to measure guide and converters. Instructions and tips for correctly measuring with or without a ring plus a sizing table and conversion ring size charts.

## At a Glance

• How do you find out your ring size? There are several ways: (1) by using a string or dental floss to measure, (2) by using an existing well-fitting ring as basis, and (3) by using a ring size stencil. Then look up the number in our ring size charts.
• How to Secretly Determine Ring Size? How do I get my Girlfriend’s Size? If you want to purchase a ring as a gift or for your engagement, you have a tough task ahead! As templates and measuring are too obvious, you could measure the inside diameter of a ring that fits.
• How much does it cost to have a ring sized? If the ring is too tight or too wide, a professional can stretch out the metal or work on shrinking it with a machine. In case of a major difference, it is also possible to add or remove a piece of the band material. Cost is between 20\$ and 150\$. But remember: Having to make a ring wider or narrower always contains risks. Even the most experienced jeweler can make a mistake. Therefore: take your time and measure precisely. Templates are not at all necessary; the instructions below require only a string and a ruler.

## Ring Size Chart

For men, women and children. US Size is also used in Canada and Mexico.

Inside Diameter (Inch)Inside Circumference (Inch)US SizeUK SizeEuro Size
0.4581.4436.50
0.4661.4637.2¼
0.4741.4937.8½
0.4821.5138.5¾
0.491.5439.11
0.4981.5639.7
0.5061.5940.40.5
0.5141.61411
0.5221.6441.721.75
0.531.6742.32.25
0.5381.6942.93
0.5461.7243.63.5
0.5541.7444.234.25
0.5621.7744.84.75
0.571.7945.55.5
0.5781.8246.16
0.5861.8446.846.75
0.5941.8747.47.5
0.6021.89488
0.611.9248.78.75
0.6181.9449.359.25
0.6261.975010
0.6341.9950.610.5
0.6422.0251.211.25
0.652.0451.9611.75
0.6582.0752.512.5
0.6662.0953.113.25
0.6742.1253.813.75
0.6822.1454.4714.5
0.692.1755.115
0.6982.1955.715.75
0.7062.2256.316.25
0.7142.2457817
0.7222.2757.617.5
0.732.2958.318.25
0.7382.3258.919
0.7462.3459.5919.5
0.7542.3760.220.25
0.7622.3960.820.75
0.772.4261.421.5
0.7782.4462.11022
0.7862.4762.710¼22.75
0.7942.4963.410½23.25
0.8022.526410¾24
0.812.5464.61124.75
0.8182.5765.311¼25.25
0.8262.5965.911½26
0.8342.6266.611¾26.5
0.8422.6567.21227.25
0.852.6767.812¼27.75
0.8582.768.512½28.5
0.8662.7269.112¾29
0.8742.7569.71329.75
0.8822.7770.413¼30.5
0.892.87113½31
0.8982.8271.713¾31.75
0.9062.8572.31432.25
0.9142.8772.914¼33
0.9222.973.614½33.5
0.932.9274.214¾34.25
0.9382.9574.81534.75
0.9462.9775.515¼35.5
0.954376.115½36.25
0.9623.0276.815¾36.75
0.973.0577.41637.5

## Ring Size Calculator

Use our Ring Size Calculator to find your correct size easily.

## How to Find the correct Size without a Ring?

So that you don’t go OUCH when putting it on, but instead get it to fit perfectly!

1. Measure the ring finger.
2. Measure in the evening or after light sporting activities.
3. Measure on days when you are hydrated enough.
4. Do not measure when you are feeling cold.
5. Be careful when taking measurements.
6. For gifts, choose a ring that is slightly bigger rather than going for the smaller one first.
7. Observe the shape and width: These features can also influence the final result.
8. For finger measurements: Measure often and on different days.
9. Let a jeweler advise you and if in doubt, get them to determine the right fit too.

Finding the correct ring size can be a challenge. But with a ring size calculator, it is easy.

## Ring Size Conversion Chart (Centimeters)

Circ. (CM)Diameter (CM)SizeUKUSFR
39,312,540-10
40,512,940,5-1 -0,5
42,113,441,5D21,5
43,313,843E2 -3
44,614,244,5F34,5
45,914,645,5G3 -5,5
47,11547H47
48,415,448I4 -8
49,615,849,5J59,5
50,916,250,5K5 -10,5
51,816,552L612
53,41753,5M6 -13,5
5517,554,5N714,5
55,917,856O7 -16
56,61856,5P816,5
58,118,558,5Q8 -18,5
59,71959,5R919,5
61,319,561S9 -21
62,519,962,5T1022,5
63,820,363,5U10 -23,5
64,420,565V1125
662166W11 -26
67,521,567,5X1227,5
69,12269Y12 -29
70,722,570Z1330

Since the human body is not absolutely symmetrical, the fingers of the left and right hand often differ. Therefore, you should already know beforehand, which exact finger the ring is to be worn on later. For example, engagement rings are worn on the left hand, while the wedding ring is normally found on the right ring finger. This applies to all materials and collections (gold, silver, platinum, silicone, wood etc.)

## Average Women’s Size

Normally range from 3.5 to 9. Sizes 5 – 7 are among the most often purchased. Average for women is 6.

## Average Men’s Size

Normally range from 8 to 14. Sizes 8 – 10 are among the most often purchased. Average for men is 9.

## Average Children’s Size

Normally range from 1 to 4. Sizes 2 – 3 are among the most often purchased. Average for children aged between 8 and 10 is 3.

## Measure Ring Size without a Ruler

You will have to resort to a few little tricks. The measurement method using a string or dental floss is popular. Find some string that is at least the length of a palm. Tie it around the root of the selected finger and make a knot around it. The string should be as close as the ring will be. Not too loose, but not too tight either. The knotted loop must also be able to be pushed over the joints of the finger. Cut the loop close to the knot and use a ruler to measure the length of the loop in millimeters. Depending on the jeweler or dealer, you have to change the length to a different measurement.

## This is how you determine the ring size with the ring

If you already have a well-fitting ring, the size is easier to determine. Cut a small strip of paper. Roll it in length and place it in the opening. The paper strip should cover the entire inner circumference. Use a sharp pencil to mark the point where the strip overlaps. Now remove the paper strip to measure the length of the strip to the mark with a ruler.

Alternatively, the diameter can be used to determine the size. Using a ruler, measure the widest part of the ring from one inner edge to the opposite inner edge. Now you only have to determine the circumference with a small calculation task. Multiply the diameter in millimeters with Pi 3.14 (diameter * 3.14 = circumference), or by using our calculator.

## What is a stencil?

A ring size stencil simplifies measurements. The stencil is a thin sheet of plastic, cardboard or paper, which has holes of different sizes. Each hole is marked with the appropriate number. All you have to do is try the stencils.

## Can rings be tightened or made wider?

Despite careful measurements, the finished ring may be too tight or too wide. It can then be changed. To this end, the professional will use two methods: It will either be stretched, or, in case of a major difference, the ring will be opened and additional material will be added. In the case of making the ring tighter, it can be worked with a machine. It is also possible to remove a piece of the material.

Whether or not the procedures are applicable to your jewelery depends on whether and how well the ring was filled with stones and the material from which it was made. Gold and platinum is usually easy to change, but stainless steel represent a greater challenge. Gemstones or diamonds can lose their hold with the changes made, which is why they may have to be re-inserted. Engravings sometimes have to be completely recreated.

## What sizes are there?

There are five standard systems. The Viennese Association for Measurement is widespread in Germany. The size corresponds to the circumference of the inner side in millimeters. Alternatively, the diameter can be specified here.

The French measure is a bit more complicated because in this case, the diameter is subtracted by another 40 millimeters (formula: diameter – 40 = size).

For the English measurement, a letter is assigned to each circumference. The appropriate size can be determined using charts. It is similar to the American system of measurement, except that they assign numbers instead of letters.

There are various standard systems for sizes. In the US, circumferences are assigned a corresponding number. In the UK, instead of numbers, sizes are labeled with letters. In France, the diameter is subtracted by another 40 millimeters (formula: diameter – 40 = size).