The average female ring size in the United States is about size 6, and most women wear between sizes 5 and 7. A size 6 ring has an inside diameter of 16.5 mm and a circumference of 51.9 mm, which is about UK size L½. Sizes 6 and 7 are the most common sizes for engagement rings and wedding bands.
An average is only a starting point. Your own size depends on your hands, your build and even the finger you choose. This guide covers the full women’s size chart, what affects ring size and how to find your exact size at home.
Women’s Ring Size Chart
| US size | Inside diameter | Inside circumference | UK size | How it compares |
|---|---|---|---|---|
| 4 | 14.9 mm | 46.8 mm | H½ | Very small |
| 4.5 | 15.3 mm | 48.0 mm | I½ | Small |
| 5 | 15.7 mm | 49.3 mm | J½ | Small |
| 5.5 | 16.1 mm | 50.6 mm | K½ | Below average |
| 6 | 16.5 mm | 51.9 mm | L½ | Average |
| 6.5 | 16.9 mm | 53.1 mm | M½ | Average |
| 7 | 17.3 mm | 54.4 mm | N½ | Common, slightly above average |
| 7.5 | 17.7 mm | 55.7 mm | O½ | Above average |
| 8 | 18.1 mm | 57.0 mm | P½ | Larger |
| 8.5 | 18.5 mm | 58.3 mm | Q½ | Larger |
| 9 | 18.9 mm | 59.5 mm | R½ | Large |
UK letters follow the British Standard scale (BS 6820), where each letter adds 1.25 mm to the inside circumference. Some UK retailers, such as H. Samuel, label sizes up to half a letter higher, so always check the seller’s own chart.
Want to know more about the two most common sizes? See our guides to the size 6 ring and the size 7 ring.
Average Ring Size by Finger
| Finger | Typical size range for women |
|---|---|
| Thumb | 7 to 9 |
| Index finger | 6 to 7.5 |
| Middle finger | 6.5 to 8 |
| Ring finger | 5 to 7, average about 6 |
| Pinky finger | 3.5 to 5 |
These are typical ranges, not rules. Your middle finger is usually about a half size larger than your ring finger, and your pinky is usually about two sizes smaller.
Average Ring Size by Height and Build
Taller women and women with larger hands usually wear larger sizes. Use this table only as a rough guide, because many women fall outside these ranges.
| Height or build | Common size range |
|---|---|
| Under 5 feet 3 inches (160 cm) | 4 to 5.5 |
| 5 feet 3 inches to 5 feet 7 inches (160 to 170 cm) | 5 to 7 |
| Over 5 feet 7 inches (170 cm) | 6 to 8 |
| Slim build | 4.5 to 6 |
| Average build | 5 to 7 |
| Fuller build | 6.5 to 8 |
Wondering if a larger size is unusual? Read is size 8 big for a woman.
What Affects a Woman’s Ring Size?
- Hand and finger shape: long, slim fingers and short, wide fingers can have different sizes even on the same height.
- Knuckle size: a large knuckle may need a bigger ring than the base of the finger.
- Dominant hand: fingers on your writing hand are often slightly bigger.
- Temperature and time of day: fingers swell in heat and in the evening, and shrink in cold.
- Pregnancy and weight changes: both can change ring size for a while or for good.
- Age and arthritis: knuckles often get larger over the years.
How to Find Your Ring Size at Home
1. Use a Ring Sizer
A printable ring sizer or a set of plastic sizing rings is the easiest way to measure at home. Print paper sizers at 100 percent scale so the result is accurate.
2. Use a Strip of Paper or String
Wrap a thin strip of paper around the base of your finger, mark where it overlaps and lay it flat on a ruler. The length in millimeters is your finger’s circumference. Match it to the circumference column in the chart above. For example, 52 mm is about a size 6.
3. Measure a Ring That Fits
Measure straight across the inside of a ring that fits the same finger. That number is the inside diameter. Match it to the diameter column. For example, 17.3 mm is a size 7.
4. Convert Your Result
Enter your measurement into our free ring size chart calculator to see your US, UK and EU sizes.
Tips for Getting the Right Size
- Measure at the end of the day, when fingers are usually at their largest.
- Measure at room temperature, not after a hot shower or time in the cold.
- Check the knuckle. If your knuckle is much bigger than the base of your finger, choose the size that slides over the knuckle with a little resistance.
- If you are between sizes, choose the larger one. A slightly loose ring can be fixed with an adjuster.
- Size up for wide bands. Bands of 6 mm or more feel tighter. See our 6mm vs 8mm ring size guide.
- Measure three times on different days and use the most common result.
Buying a Ring as a Surprise?
- Borrow a ring she wears on the same finger and measure its inside diameter.
- Ask a close friend or family member who may know her size.
- If you have to guess, size 6 or 7 is the safest choice, and go slightly larger rather than smaller.
- Choose a ring that can be resized easily, such as a plain gold or platinum band.
Frequently Asked Questions
What is the average female ring size?
About size 6 in the United States, with most women wearing between sizes 5 and 7.
What is the most common ring size for women?
Sizes 6 and 7 are the most common, especially for engagement rings.
Is size 7 big for a woman?
No. Size 7 is very common and only slightly above average.
What is the average female ring size in the UK?
Around UK size K½ to M½, which matches US sizes 5.5 to 6.5.
Can a woman’s ring size change?
Yes. Pregnancy, weight changes, age and temperature can all change ring size.
What should I do if I am between two sizes?
Choose the larger size, especially for wide bands. A slightly loose ring is easier to fix than a tight one.
Buying a ring as a surprise? See how to find someone’s ring size secretly without spoiling it.
Final Thoughts
The average female ring size is about size 6, and most women wear between sizes 5 and 7. But the only size that really matters is yours.
Measure at the end of the day, check your knuckle, size up for wide bands and confirm your result before you buy. That way your ring will fit comfortably every day.
Buying for a younger person? See our chart of ring sizes for kids and teens by age, which covers babies, children and teens.
