Are you struggling to find your perfect ring size for an online purchase?
Our free inches to ring size converter helps you accurately convert finger circumference measurements in inches to ring sizes across multiple systems:
- US and Canadian sizes
- UK, Australian, and New Zealand sizes
- French sizes
- German sizes
- Japanese sizes
Whether you’re shopping for an engagement ring, wedding band, or fashion jewelry locally or internationally, getting the right size is crucial for comfort and security.
Inches To Ring Size Calculator
Women’s Common Sizes:
US/CA: 5-7 (avg 6) | UK/AU/NZ: J-N (avg L)
France: 49-54 (avg 51.5) | Germany: 15.75-17.25 (avg 16.5) | Japan: 9-14 (avg 12)
Men’s Common Sizes:
US/CA: 8-10 (avg 9) | UK/AU/NZ: Q-T½ (avg R½)
France: 56.5-61.5 (avg 59) | Germany: 18-20 (avg 19) | Japan: 16-20 (avg 18)
How to Measure Your Ring Size at Home
Follow these detailed steps to get an accurate finger measurement:
Method 1: String or Paper Strip Method
Gather your materials:
- A piece of string or thin paper strip
- A ruler with inch measurements
- A pen or marker
- A flat surface
Measuring process:
- Wait until the end of the day when your fingers are at their largest
- Wrap the string/paper around the base of your finger
- Mark where the string/paper overlaps
- Lay the string/paper flat against a ruler
- Measure the length in inches (should be between 1.74″ and 2.75″)
Important tips:
- Don’t pull the string too tight
- Measure the exact finger you plan to wear the ring on
- Take multiple measurements for accuracy
- Record all size conversions for international shopping
Method 2: Using an Existing Ring
- Place it on a ruler or measuring tape
- Measure the inner diameter in inches
- Use our converter to find your size in all systems
- Verify the measurement with multiple rings
Why Accurate Ring Sizing Matters
Getting the right ring size is more important than you might think.
A ring that’s too tight can cause discomfort and restrict blood flow, while a loose ring risks falling off and getting lost.
Professional jewelers report that incorrect sizing is the number one issue with online ring purchases, often leading to costly resizing procedures or returns.
This becomes even more critical when shopping internationally, as resizing services may not be readily available for rings purchased abroad.
Inch To Ring Size Conversion Chart
| IN | MM | US & CA | UK, AUS, NZ & IE | France | Germany | Japan |
|---|---|---|---|---|---|---|
| 1.74 | 44.2 | 3 | F | 44 | 14 | 4 |
| 1.77 | 44.8 | 3.25 | F-½ | 44.625 | 14.25 | — |
| 1.79 | 45.5 | 3.5 | G | 45.25 | 14.5 | 5 |
| 1.82 | 46.1 | 3.75 | G-½ | 45.875 | 14.75 | 6 |
| 1.84 | 46.8 | 4 | H-½ | 46.5 | 15 | 7 |
| 1.87 | 47.4 | 4.25 | I | 47.125 | 15.25 | — |
| 1.89 | 48 | 4.5 | I-½ | 47.75 | 15.5 | 8 |
| 1.92 | 48.7 | 4.75 | J | 48.375 | — | — |
| 1.94 | 49.3 | 5 | J-½ | 49 | 15.75 | 9 |
| 1.97 | 50 | 5.25 | K | 49.625 | 16 | — |
| 1.99 | 50.6 | 5.5 | K-½ | 50.25 | 16.25 | 10 |
| 2.02 | 51.2 | 5.75 | L | 50.875 | — | 11 |
| 2.04 | 51.9 | 6 | L-½ | 51.5 | 16.5 | 12 |
| 2.07 | 52.5 | 6.25 | M | 52.125 | 16.75 | — |
| 2.09 | 53.1 | 6.5 | M-½ | 52.75 | 17 | 13 |
| 2.12 | 53.8 | 6.75 | N | 53.375 | — | — |
| 2.14 | 54.4 | 7 | O | 54 | 17.25 | 14 |
| 2.17 | 55.1 | 7.25 | O-½ | 54.625 | 17.5 | — |
| 2.19 | 55.7 | 7.5 | P | 55.25 | 17.75 | 15 |
| 2.22 | 56.3 | 7.75 | P-½ | 55.875 | — | — |
| 2.24 | 57 | 8 | Q | 56.5 | 18 | 16 |
| 2.27 | 57.6 | 8.25 | Q-½ | 57.125 | 18.25 | — |
| 2.29 | 58.3 | 8.5 | Q-¾ | 57.75 | 18.5 | 17 |
| 2.32 | 58.9 | 8.75 | R | 58.375 | 18.75 | — |
| 2.34 | 59.5 | 9 | R-½ | 59 | 19 | 18 |
| 2.37 | 60.2 | 9.25 | S | 59.625 | 19.25 | — |
| 2.39 | 60.8 | 9.5 | S-½ | 60.25 | 19.5 | 19 |
| 2.42 | 61.4 | 9.75 | T | 60.875 | 19.75 | — |
| 2.44 | 62.1 | 10 | T-½ | 61.5 | 20 | 20 |
| 2.47 | 62.7 | 10.25 | U | 62.125 | 20.25 | 21 |
| 2.49 | 63.4 | 10.5 | U-½ | 62.75 | 20.5 | 22 |
| 2.52 | 64 | 10.75 | V | 63.375 | — | — |
| 2.54 | 64.6 | 11 | V-½ | 64 | 20.75 | 23 |
| 2.57 | 65.3 | 11.25 | W | 64.625 | — | — |
| 2.59 | 65.9 | 11.5 | W-½ | 65.25 | 21 | 24 |
| 2.62 | 66.6 | 11.75 | X | 65.875 | — | — |
| 2.65 | 67.2 | 12 | Y | 66.5 | 21.25 | 25 |
| 2.67 | 67.8 | 12.25 | Y-½ | 67.125 | 21.5 | — |
| 2.7 | 68.5 | 12.5 | Z | 67.75 | 21.75 | 26 |
| 2.72 | 69.1 | 12.75 | Z-½ | 68.375 | — | — |
| 2.75 | 69.7 | 13 | — | 69 | 22 | 27 |
Average Ring Sizes By Region
Women’s Common Sizes:
- US/CA: 5-7 (avg 6)
- UK/AU/NZ: J-N (avg L)
- France: 49-54 (avg 51.5)
- Germany: 15.75-17.25 (avg 16.5)
- Japan: 9-14 (avg 12)
Men’s Common Sizes:
- US/CA: 8-10 (avg 9)
- UK/AU/NZ: Q-T½ (avg R½)
- France: 56.5-61.5 (avg 59)
- Germany: 18-20 (avg 19)
- Japan: 16-20 (avg 18)
Children’s Ring Sizes (US):
- Ages 3-5: Size 2-3
- Ages 6-8: Size 3-4
- Ages 9-12: Size 4-5
- Teens: Size 5-7
Factors Affecting Ring Size
Time of Day
- Fingers are typically smaller in the morning
- Swelling occurs throughout the day
- Best to measure in the evening for most accurate size
Temperature
- Cold weather causes fingers to shrink
- Heat and humidity cause swelling
- Consider seasonal changes when sizing
Physical Activity
- Exercise can cause temporary swelling
- Weight fluctuations affect ring size
- Pregnancy can significantly change finger size
Ring Style
- Wide bands need larger sizes
- Comfort-fit rings may fit differently
- Stacking rings might need adjustment
- Engagement rings with large stones may need sizing up
Common Ring Sizing Mistakes to Avoid
Measuring When Fingers Are Cold
- Cold fingers are smaller than normal
- Wait until hands are at room temperature
- Consider your typical environment
Using String That’s Too Thick
- Thick string gives inaccurate measurements
- Use thin, non-stretchy string
- Paper strips can be more accurate
Taking Only One Measurement
- Finger size fluctuates
- Take 3-4 measurements over different days
- Calculate the average for best results
Ignoring Knuckle Size
- Consider knuckle width when sizing
- Ring must fit over knuckle
- May need slightly larger size
Professional Sizing Tips
Visit a Jeweler
- Get sized professionally for important purchases
- Use home measurements as a starting point
- Most jewelers offer free sizing services
- Especially important for international purchases
Ring Sizers
- Purchase a ring sizer set for home use
- More accurate than string method
- Available with international size markings
- Reusable for future measurements
Sizing Beads
- Consider adding sizing beads for loose rings
- Helps with knuckle issues
- Provides better fit for wide knuckles
- Available worldwide
Frequently Asked Questions
What ring size is 1/2 inch?
A 1/2 inch measurement is too small for standard ring sizes. This is likely a diameter measurement. If it’s diameter, multiply by 3.14 to get circumference (1.57 inches), which would be smaller than standard ring sizing begins (1.74 inches).
What ring size is 3/4 inch?
If measuring diameter, multiply by 3.14 to get circumference (2.355 inches), which corresponds to approximately US size 9-9.5. If this is a circumference measurement, it would be too small for standard ring sizes.
What ring size is 2 inches?
A 2-inch circumference corresponds to approximately US size 5.75 or UK size L. This fits within standard women’s ring sizing range.
What is a 2 1/8 inch ring size?
A 2.125-inch circumference corresponds to approximately US size 6.75-7 or UK size N.
What is a 2.2 inch ring size?
A 2.2-inch circumference corresponds to approximately US size 7.5 or UK size P.
What is a 2.5 inch ring size?
A 2.5-inch circumference corresponds to approximately US size 10.75 or UK size V.
What size is a 2 5/8 inch ring?
A 2.625-inch circumference corresponds to approximately US size 11.75-12 or UK size X/Y.
What is a 2 3/4 inch or 2.75 inch ring size?
A 2.75-inch circumference corresponds to US size 13 or UK size Z. These are equivalent measurements (2 3/4 = 2.75).
What is a 2 7/8 inch ring size?
A 2.875-inch circumference corresponds to approximately US size 13.5, which is at the upper end of standard ring sizes.
What is a 3 inch ring size?
A 3-inch circumference is beyond most standard ring size charts. For both men and women, this would be considered an extremely large size and might require custom sizing.
What is a 3.5 inch ring size?
A 3.5-inch circumference is well beyond standard ring size charts and would require custom sizing. If you’re getting this measurement, please double-check if you’re measuring diameter instead of circumference.
Important Note:
- Always specify whether measuring diameter or circumference
- Most jewelers use inside circumference for ring sizes
- Standard ring sizes typically range from 1.74 inches to 2.75 inches (circumference)
- For accurate sizing, visit a jeweler or use a professional ring sizer
When to Seek Professional Sizing
Consider professional sizing for:
- Engagement rings
- Wedding bands
- Family heirlooms
- Expensive jewelry
- Unique ring designs
- Rings with intricate settings
- International purchases
Final Thoughts
Finding your perfect ring size doesn’t have to be complicated, even when shopping internationally.
Use our converter tool and follow the measurement guidelines above for the best results.
Remember that professional sizing is always recommended for important purchases, but our converter provides a reliable starting point for your ring sizing journey.
Keep in mind that different countries use different sizing systems, so always double-check your measurements and conversions when shopping internationally.
When in doubt, consult with a professional jeweler who has experience with international sizing.
Need help or have questions? Contact a professional jeweler in your area for personalized assistance. Happy ring shopping!