Find out your ring size in the RU, EU, US, UK, JP, CN systems. Online calculator for converting sizes by diameter or circumference of a finger.
Российские размеры колец (14-24)
• Measure the inner diameter of the ring with a ruler or caliper
• To measure your finger, use a strip of paper or a special measuring ring
• All sizes are based on international standards
Our ring size converter will help you determine exactly what size you need when ordering jewelry overseas. Simply enter your ring size or inner diameter and you will receive a conversion table for RU, EU, US, UK, JP and CN systems.
The ring size converter uses international standards to accurately convert between RU (Russia), EU (Europe), US (USA), UK (UK), JP (Japan) and CN (China) systems. You can convert sizes in two ways: by ring size (in numeric or alphabetic format) or by the inner diameter of the ring in millimeters. All sizes are converted based on a single diameter standard to ensure accuracy.
Let's look at practical examples of converting ring sizes for different systems and measurement methods:
Ring size 16 (RU), need to find US equivalent
Входные данные:
Measurement type: ring size, Country: RU, Value: 16Конвертация:
RU 16 → injection diameter 16.5 mm → US 6 = EU 52 = UK JP 10 = CNРезультат:
Result: US 6, EU 52, UK J, JP 10, CN 16
Диаметр:
Inner diameter: 16.5mm
Russian size 16 corresponds to US size 6
Ring inner diameter 17.5mm, need to find size in Europe
Входные данные:
Measurement type: diameter, Country: any, Value: 17.5 mmКонвертация:
Diameter 17.5mm → RU 17 = EU 54 = US 7 = UK K = JP 12 = CN 17Результат:
Result: RU 17, EU 54, US 7, UK K, JP 12, CN 17
Диаметр:
Inner diameter: 17.5mm
Diameter 17.5 mm - standard size for the middle finger
Ring size US 5, need to find UK size
Входные данные:
Measurement Type: Ring Size, Country: US, Value: 5Конвертация:
US 5 → injection diameter 15.7 mm → UK H = RU 15 = EU 50 = JP 8 = CNРезультат:
Result: UK H, RU 15, EU 50, JP 8, CN 15
Диаметр:
Inner diameter: 15.7mm
US size 5 corresponds to UK letter H
Ring size JP 15, need to find size in Europe
Входные данные:
Measurement Type: Ring Size, Country: JP, Value: 15Конвертация:
JP 15 → injection diameter 18.9 mm → EU 58 = US 9 = UK N = RU 19 = CNРезультат:
Score: EU 58, US 9, UK N, RU 19, CN 19
Диаметр:
Inner diameter: 18.9mm
Japanese size 15 corresponds to European size 58
Diameter measured 16.0 mm, need to find dimensions in all systems
Входные данные:
Measurement type: diameter, Country: any, Value: 16.0 mmКонвертация:
Diameter 16.0 mm → RU 15.5 = EU 51 = US 5.5 = UK I = JP 9 = CN 15.5Результат:
Result: RU 15.5, EU 51, US 5.5, UK I, JP 9, CN 15.5
Диаметр:
Inner diameter: 16.0mm
16.0mm diameter is a popular size for engagement rings
Chinese ring size 18, need to find size in Russia
Входные данные:
Measurement Type: Ring Size, Country: CN, Value: 18Конвертация:
CN 18 → injection diameter 18.2 mm → RU 18 = EU 57 = US 8 = UK M = JPРезультат:
Result: RU 18, EU 57, US 8, UK M, JP 13
Диаметр:
Inner diameter: 18.2mm
Chinese size 18 corresponds to Russian size 18
All sizes are converted based on the inner diameter of the ring in millimeters. Each system has its own standards, but they are all tied to a single diameter, which ensures accurate translation between countries.
Все системы размеров колец основаны на внутреннем диаметре кольца в миллиметрах. Независимо от системы (RU, EU, US, UK, JP, CN), один и тот же диаметр соответствует одному и тому же размеру в разных системах. Например, диаметр 16.5 мм всегда соответствует RU 16, EU 52, US 6, UK J, JP 10, CN 16.
To measure ring size, you can use the inside diameter of an existing ring or measure the circumference of your finger. All measurements must be accurate to obtain the correct size.
| Side | Size range | Description |
|---|---|---|
| 🇷🇺 RU | 14-24 | Russian ring sizes |
| 🇪🇺 EU | 44-64 | European ring sizes |
| 🇺🇸 US | 3-8 | American ring sizes |
| 🇬🇧 UK | F-P | UK ring sizes (letter) |
| 🇯🇵 JP | 1-21 | Japanese ring sizes |
| 🇨🇳 CN | 4-24 | Chinese ring sizes |
Accurate size tables, instant conversion, support for 6 sizing systems, user-friendly interface, mobile version.
All sizes are based on international standards
Instant conversion between systems
Support 4 languages
To determine ring diameter size, measure the inside diameter of the existing ring with a ruler or caliper in millimeters. Then enter the measured diameter into the ring size converter, selecting the "diameter" measurement type. The calculator automatically converts diameter into sizes of all systems (RU, EU, US, UK, JP, CN). For example, a diameter of 16.5 mm corresponds to RU 16, EU 52, US 6, UK J.
To convert Russian ring size to American, use the converter: select the measurement type “ring size”, country “RU” and enter your size. The calculator will instantly show the equivalent in the US system and other countries. For example, Russian size 16 = US size 6, size 17 = size 7, size 18 = size 8. Sizes are converted based on the inner diameter of the ring.
To convert ring size from EU to US, use the converter: select the measurement type “ring size”, country “EU” and enter the size. For example, European size 52 = US size 6, EU 54 = US 7, EU 56 = US 8, EU 58 = US 9. The ring size chart is based on international standards, where each size corresponds to a specific inner diameter of the ring in millimeters.
To measure your engagement ring size without an existing ring: 1) Wrap a strip of paper around your finger where the ring will be; 2) Mark the intersection; 3) Measure the length of the strip in millimeters; 4) Divide by π (3.14) to obtain the diameter; 5) Enter the diameter into the converter. For example, circumference 52 mm = diameter 16.5 mm = US size 6. Measure in the evening when your fingers are slightly swollen.
Wedding ring sizes vary by country: RU (Russia) uses the number system 14-24, EU (Europe) uses 44-64, US (USA) uses 3-8, UK (UK) uses the letter designations F-P. All systems are based on the inner diameter of the ring in millimeters. For example, diameter 16.5 mm = RU 16 = EU 52 = US 6 = UK J. The converter automatically shows all matches.
To convert Japanese ring size to Russian, select the measurement type “ring size”, country “JP” and enter the size. Japanese sizes are usually close to European ones: JP 10 = RU 16 = EU 52 = US 6, JP 12 = RU 18 = EU 56 = US 8, JP 15 = RU 19 = EU 58 = US 9. The converter takes into account the peculiarities of the Japanese sizing system and shows exact matches for all countries.
To correctly measure the inner diameter of a ring: 1) Take a ruler or caliper; 2) Measure the distance between the inner edges of the ring at the widest part; 3) Measure in millimeters for accuracy; 4) Make sure you measure diameter and not circumference. Diameter is the distance in a straight line through the center of the ring. For example, a diameter of 16.5 mm corresponds to size RU 16. A caliper gives a more accurate measurement than a ruler.
To calculate the size of the ring according to the circumference of your finger: 1) Measure the circumference of your finger with a strip of paper or thread; 2) Get the length in millimeters; 3) Divide by π (3.14) to obtain the diameter (diameter = circumference / π); 4) Enter the diameter into the converter. For example, circumference 52 mm ÷ 3.14 = diameter 16.5 mm = US size 6. The circumference can be measured in the evening, when the fingers are slightly swollen, for a more accurate result.
Yes, the ring size converter is fully suitable for wedding rings, as well as engagement rings, signet rings, signet rings and any other type of rings. The converter uses standardized size charts that are suitable for all types of jewelry. It is only important to correctly measure the inner diameter or circumference of the finger. For wedding rings, it is recommended to measure in the evening and take into account the width of the ring (wide rings require a larger size).
The ring size charts in the converter are based on international ISO standards and are regularly updated to ensure maximum accuracy. Sizes are converted based on exact matches of the inner diameters of the rings in millimeters. However, accuracy may vary by manufacturer as some brands may use their own sizing charts. The converter gives approximate values, which in most cases correspond to standard sizes. For critical purchases, it is recommended that you additionally check the specific manufacturer's sizing charts.
Diameter 16 mm corresponds to the following sizes: RU 15.5, EU 50-51, US 5-5.5, UK I, JP 8-9, CN 15.5. This is a medium size, suitable for many women and some men. The 16mm diameter is often used for engagement and wedding rings. The converter automatically shows all matches when entering the diameter. Please note that even a small difference of 0.5mm can change the size, so it is important to measure the diameter accurately.
UK ring sizes use letter designations from F to P. To convert, select the measurement type "ring size", country "UK" and enter the letter (for example, J, K, L). The converter will automatically show the equivalents: UK J = US 6 = EU 52 = RU 16, UK K = US 7 = EU 54 = RU 17, UK L = US 8 = EU 56 = RU 18. UK letter sizes are easy to remember and are widely used in the jewelry industry.
To convert Chinese ring size to European, select the measurement type "ring size", country "CN" and enter the size. Chinese sizes are often close to Russian and European: CN 16 = EU 52 = RU 16 = US 6, CN 18 = EU 56 = RU 18 = US 8, CN 20 = EU 60 = RU 20 = US 10. The converter takes into account the features of the Chinese sizing system and shows exact matches for all countries. Chinese sizes may vary by region.
Yes, the ring size converter can be used to determine the size of a diamond ring, engagement ring with stones, or any other piece of jewelry. The converter works with the inner diameter of the ring, which is independent of the presence or type of inserts. It is important to correctly measure the inner diameter of the ring where the finger contacts the metal. Rings with a wide setting may require a 0.5 size larger due to the increased width.
To measure ring size with a paper strip: 1) Cut a strip of paper 1 cm wide; 2) Wrap the strip tightly around your finger where the ring will be (not too tight); 3) Mark the intersection with a pencil; 4) Unfold the strip and measure the length in millimeters; 5) Divide by π (3.14) to obtain the diameter; 6) Enter the diameter into the converter. For example, length 52 mm ÷ 3.14 = 16.5 mm diameter = US size 6. Measure in the evening for a more accurate result.
To determine your engagement ring size: 1) Measure your finger in the evening when it is slightly swollen (more accurate measurement); 2) Use a paper strip or a special ring meter; 3) Measure the circumference or diameter; 4) Use the converter to obtain the size in the desired system; 5) Consider the width of the ring (wide engagement rings require a size 0.5 larger). Popular engagement ring sizes: US 6 (EU 52, RU 16), US 7 (EU 54, RU 17), US 8 (EU 56, RU 18).
Ring sizes for men are usually larger than for women due to the thicker fingers. Average sizes: women - US 6-7 (EU 52-54, RU 16-17, diameter 16.5-17.3 mm), men - US 9-10 (EU 58-60, RU 19-20, diameter 19.1-19.9 mm). However, sizes are individual and may vary. The size converter works the same for men's and women's rings, as it uses a single diameter system. The size is determined only by the inner diameter of the ring, not by the gender.
To convert a ring size from US to UK letter, select the measurement type "ring size", country "US" and enter the size. The converter will automatically show the UK letter equivalent: US 5 = UK H, US 6 = UK J, US 7 = UK K, US 8 = UK L, US 9 = UK N, US 10 = UK O. UK sizes use letters from F (smallest) to P (largest). The converter takes into account all correspondences between numeric and alphabetic systems.
The online ring size converter can be used as a guide, but for critical purchases (especially engagement and wedding rings) it is recommended to: 1) Double check the diameter or circumference measurement; 2) Check the size charts of a specific manufacturer or store; 3) Consult a jeweler for accurate measurements; 4) If possible, try on a ring of a similar size. The converter uses standardized tables that are suitable for most manufacturers, but individual brands may have slight differences.
To convert the ring diameter in millimeters to size, use the converter: select the “diameter” measurement type and enter the value in millimeters. The calculator automatically converts diameter to dimensions for all systems. Standard fits: 15.7mm = US 5, 16.5mm = US 6, 17.3mm = US 7, 18.1mm = US 8, 18.9mm = US 9, 19.7mm = US 10. Diameter is measured between the inner edges of the ring. The larger the diameter, the larger the ring size in all systems.
Japanese and Chinese ring sizes are based on the same diameter system as European ones, but use their own numbering. Japanese sizes: JP 10 = EU 52 = RU 16, JP 12 = EU 56 = RU 18, JP 15 = EU 58 = RU 19. Chinese sizes: CN 16 = EU 52 = RU 16, CN 18 = EU 56 = RU 18, CN 20 = EU 60 = RU 20. The main difference is in numbering, not diameter. The converter takes these differences into account and shows exact matches. Sizes may vary depending on manufacturer.
To measure ring size with calipers: 1) Take a caliper (vernier or digital); 2) Place the jaws of the caliper inside the ring; 3) Gently spread the jaws until they touch the inner edges of the ring; 4) Record the measurement; 5) Read the value in millimeters; 6) Enter the diameter into the converter. A caliper gives a more accurate measurement than a ruler (accuracy up to 0.1 mm). For example, measured diameter 16.5mm = US size 6. Measure at the widest part of the inner diameter of the ring.
To select the correct engagement ring size when purchasing online: 1) Measure the inner diameter of your existing ring or the circumference of your finger; 2) Use the converter to get the size in the store system; 3) Check the size chart on the store’s website; 4) Consider the width of the ring (wide rings require a size 0.5 larger); 5) Measure in the evening, when your fingers are slightly swollen; 6) If in doubt, choose a size 0.5 larger; 7) Check the return and exchange policy. For engagement and wedding rings, additional consultation with a jeweler is recommended.
Yes, the ring size converter can be used for signets, rings, wedding rings, engagement rings and any other jewelry that fits on the finger. The converter works with the inner diameter of the ring, which is the same for all types of rings. However, wide signets and rings may require a size 0.5-1 larger due to the increased width and weight of the product. Keep in mind that signets often have a wider frame, so measure the inner diameter where it touches your finger.
To determine your ring size based on your finger without an existing ring: 1) Wrap a strip of paper around your finger where the ring will be (not too tight, but snug); 2) Mark the intersection; 3) Measure the circumference in millimeters; 4) Divide by π (3.14) to obtain the diameter; 5) Enter the diameter into the converter. Alternative: Use a ring gauge (a special tool) or visit a jeweler for a professional measurement. Measure in the evening and at a comfortable temperature for a more accurate result.
Yes, the width of the ring affects the wearing comfort, so wide rings (more than 6-8 mm) should be 0.5-1 size larger than narrow rings (less than 4 mm). This is because wider rings put more pressure on the finger and can be uncomfortable if the size is too small. For narrow wedding rings (3-4 mm), you can use the standard size. For wide signets and rings (8-12 mm), it is recommended to increase the size by 0.5-1. The converter gives a base size that can be adjusted depending on the width of the ring.
Yes, the ring size is different for different fingers due to different finger thicknesses. Usually: the ring finger of the left hand (for a wedding finger) is medium size, the ring finger of the right hand is 0.5-1 size larger, the index finger is 1 size larger, the little finger is 2-3 sizes smaller, the thumb is 3-4 sizes larger. Sizes are individual and may vary. The converter can be used to determine the size of any finger - simply measure the diameter or circumference of the desired finger and enter the value into the calculator.
To purchase rings on AliExpress, use a converter, taking into account that most products from Chinese sellers use Chinese sizes (CN). Select the measurement type "ring size", country "CN" and enter the size. Also consider: 1) Read reviews about the size of a specific product; 2) Measure the diameter or circumference of your finger accurately; 3) Check the size charts in the product description; 4) Choose a size 0.5 larger if in doubt; 5) Please note that Chinese sizes may vary; 6) Check the return policy. Chinese sizes are often close to Russian and European ones.
Yes, the ring size converter works for all types of metals (gold, silver, platinum, titanium, stainless steel) and alloys. The ring size is determined by the inner diameter, which is the same regardless of the material. However, be aware of the specifics: gold and silver rings may stretch slightly over time, titanium rings are not resizable, platinum rings are heavier and may require a slightly larger size. The converter shows the base size, which can be adjusted depending on the material and width of the ring.
The ring size correspondence table shows the equivalents between RU, EU, US, UK, JP, CN systems. To use: 1) Determine your size in one system; 2) Find the corresponding line in the table; 3) Read the equivalents on all systems. For example, size RU 16 = EU 52 = US 6 = UK J = JP 10 = CN 16, diameter 16.5 mm. The converter automatically displays the entire correspondence table when entering a size or diameter. The table is based on the inner diameter of the ring in millimeters, which is the same standard for all systems.
*Диаметр указан для внутреннего размера кольца