Ring Size Chart & Guide
Not sure what your ring size is? You’re not alone — it’s one of the most common questions people have before buying a ring online. This guide gives you a full ring size chart, simple measuring methods, and quick answers so you get it right the first time.
US Ring Size Chart
| US Size | Diameter (mm) | Circumference (mm) | Circumference (inches) |
|---|---|---|---|
| 3 | 14.1 | 44.3 | 1.74 |
| 4 | 14.9 | 46.8 | 1.84 |
| 5 | 15.7 | 49.3 | 1.94 |
| 6 | 16.5 | 51.9 | 2.04 |
| 7 | 17.3 | 54.4 | 2.14 |
| 8 | 18.1 | 57.0 | 2.24 |
| 9 | 19.0 | 59.5 | 2.34 |
| 10 | 19.8 | 62.1 | 2.44 |
| 11 | 20.6 | 64.6 | 2.54 |
| 12 | 21.4 | 67.2 | 2.65 |
| 13 | 22.2 | 69.7 | 2.75 |
| 14 | 23.0 | 72.3 | 2.85 |
Why Accurate Ring Sizing Matters?
Getting your ring size right the first time saves money, time, and comfort down the road.
Rings You Should Never Guess On
Engagement rings and wedding bands are worn every day for years, so getting the right size is essential. A poor fit can cause discomfort or increase the risk of losing a valuable ring.
Eternity bands and rings with stones set all the way around are often difficult or impossible to resize. Measuring accurately with a ring size chart before buying can help you avoid expensive alterations later.
Get Your Exact Ring Size : Ring Size Calculator
How to Measure Ring Size?
You don’t need a jeweler on hand — these methods work well from home.
Method 1 – Measure an Existing Ring
Grab a ring that already fits the finger you’re sizing for and lay it flat. Measure the inside diameter in millimeters with a ruler, from one inner edge straight across to the other.
Match that number to the diameter column on the ring size chart above. This method works best with a ring that has a smooth, rounded band.
Method 2 – The String or Paper Strip Method
Cut a thin strip of paper or string and wrap it snugly around the base of your finger. Mark the point where the ends meet, then lay it flat against a ruler.
The number in millimeters is your finger’s circumference. Compare it to the circumference column on the chart to find your exact ring size.
Method 3 – Use a Printable Ring Sizer
Print a ring sizer chart at 100% scale, since resizing the page throws off the measurement. Cut out the sizer and wrap it around your finger like a paper ring.
Adjust until it feels snug but still slides over your knuckle without force. The size marked at the overlap point is your ring size.
Best Time and Way to Measure for Accuracy
Measure your finger in the evening, when it naturally reaches its largest size. Avoid measuring immediately after a workout, a hot shower, or in cold weather, as your finger size can temporarily change.
Take the measurement two or three times to ensure consistent results. If your measurement falls between two sizes, always choose the larger size for a more comfortable fit.
International Ring Size Conversion Chart
| US Size | UK Size | EU Size | Circumference (mm) | Circumference (cm) | Circumference (inches) |
|---|---|---|---|---|---|
| 3 | F 1/2 | 44 | 44.2 | 4.42 | 1.74 |
| 3.25 | G | 44.5 | 45.6 | 4.56 | 1.79 |
| 3.5 | G 1/2 | 45.5 | 45.9 | 4.59 | 1.81 |
| 3.75 | H | 46 | 46.5 | 4.65 | 1.83 |
| 4 | H 1/2 | 46.5 | 46.8 | 4.68 | 1.84 |
| 4.25 | I | 47 | 48.1 | 4.81 | 1.89 |
| 4.5 | J | 48 | 49.0 | 4.90 | 1.93 |
| 4.75 | J 1/2 | 48.5 | 49.3 | 4.93 | 1.94 |
| 5 | K | 49 | 49.3 | 4.93 | 1.94 |
| 5.25 | K 1/2 | 50 | 50.6 | 5.06 | 1.99 |
| 5.5 | L | 50.5 | 51.9 | 5.19 | 2.04 |
| 5.75 | L 1/2 | 51 | 52.2 | 5.22 | 2.06 |
| 6 | M | 51.5 | 51.9 | 5.19 | 2.04 |
| 6.25 | M 1/2 | 52.5 | 53.1 | 5.31 | 2.09 |
| 6.5 | N | 53 | 54.0 | 5.40 | 2.13 |
| 6.75 | N 1/2 | 53.5 | 54.3 | 5.43 | 2.14 |
| 7 | O | 54.5 | 54.5 | 5.45 | 2.15 |
| 7.25 | O 1/2 | 55 | 55.6 | 5.56 | 2.19 |
| 7.5 | P | 55.5 | 56.6 | 5.66 | 2.23 |
| 7.75 | P 1/2 | 56.5 | 56.9 | 5.69 | 2.24 |
| 8 | Q | 57 | 58.1 | 5.81 | 2.29 |
| 8.25 | Q 1/2 | 57.5 | 58.4 | 5.84 | 2.30 |
| 8.5 | R | 58 | 59.1 | 5.91 | 2.33 |
| 8.75 | R 1/2 | 59 | 59.4 | 5.94 | 2.34 |
| 9 | S | 59.5 | 60.3 | 6.03 | 2.37 |
| 9.25 | S 1/2 | 60 | 60.9 | 6.09 | 2.40 |
| 9.5 | T | 61 | 62.1 | 6.21 | 2.44 |
| 9.75 | T 1/2 | 61.5 | 62.4 | 6.24 | 2.46 |
| 10 | U | 62 | 63.5 | 6.35 | 2.50 |
| 10.25 | U 1/2 | 63 | 63.8 | 6.38 | 2.51 |
| 10.5 | V | 63.5 | 64.6 | 6.46 | 2.54 |
| 10.75 | V 1/2 | 64 | 64.9 | 6.49 | 2.56 |
| 11 | W | 64.5 | 66.0 | 6.60 | 2.60 |
| 11.25 | W 1/2 | 65.5 | 66.3 | 6.63 | 2.61 |
| 11.5 | X | 66 | 67.2 | 6.72 | 2.65 |
| 11.75 | X 1/2 | 66.5 | 67.5 | 6.75 | 2.66 |
| 12 | Y | 67.5 | 68.5 | 6.85 | 2.70 |
| 12.25 | Y 1/2 | 68 | 68.8 | 6.88 | 2.71 |
| 12.5 | Z | 68.5 | 69.8 | 6.98 | 2.75 |
| 12.75 | Z 1/2 | 69 | 70.1 | 7.01 | 2.76 |
| 13 | Z+1 | 70 | 70.0 | 7.00 | 2.76 |
| 13.25 | Z+1 1/2 | 70.5 | 71.0 | 7.10 | 2.80 |
| 13.5 | Z+2 | 71 | 72.0 | 7.20 | 2.83 |
| 13.75 | Z+2 1/2 | 71.5 | 72.3 | 7.23 | 2.85 |
| 14 | Z+3 | 72 | 72.9 | 7.29 | 2.87 |
| 14.25 | Z+3 1/2 | 72.5 | 73.2 | 7.32 | 2.88 |
| 14.5 | Z+4 | 73.5 | 74.2 | 7.42 | 2.92 |
| 14.75 | Z+4 1/2 | 74 | 74.5 | 7.45 | 2.93 |
| 15 | Z+5 | 74.5 | 75.5 | 7.55 | 2.97 |
| 15.25 | Z+5 1/2 | 75 | 75.8 | 7.58 | 2.98 |
| 15.5 | Z+6 | 76 | 76.8 | 7.68 | 3.02 |
| 15.75 | Z+6 1/2 | 76.5 | 77.1 | 7.71 | 3.04 |
| 16 | Z+7 | 77 | 77.5 | 7.75 | 3.05 |
Men’s vs Women’s Ring Size Chart
| Category | Common US Sizes | Average Size | Circumference Range (mm) | Diameter Range (mm) | Typical Finger |
|---|---|---|---|---|---|
| Women’s Extra Small | 3 – 4 | 3.5 | 44.2 – 46.8 | 14.1 – 14.9 | Pinky |
| Women’s Small | 4.5 – 5.5 | 5 | 49.0 – 51.9 | 15.7 – 16.5 | Ring Finger |
| Women’s Medium | 6 – 7 | 6.5 | 51.9 – 54.5 | 16.5 – 17.3 | Ring Finger |
| Women’s Large | 7.5 – 8.5 | 8 | 56.6 – 59.1 | 18.1 – 18.9 | Ring Finger |
| Men’s Small | 7 – 8 | 7.5 | 54.5 – 58.1 | 17.3 – 18.1 | Ring Finger |
| Men’s Medium | 8.5 – 10 | 9 | 59.1 – 63.5 | 18.9 – 19.8 | Ring Finger |
| Men’s Large | 10.5 – 12 | 11 | 64.6 – 68.5 | 20.6 – 21.4 | Ring Finger |
| Men’s Extra Large | 12.5 – 16 | 14 | 69.8 – 77.5 | 22.2 – 24.7 | Ring Finger |
FAQs About Ring Size
How do I calculate my ring size?
Wrap a string or paper strip around your finger, mark the overlap, then measure the length in millimeters. Match that number to the circumference column on a ring size chart.
How big is a 7 size ring?
A US size 7 ring has an inner diameter of about 17.3mm and a circumference of roughly 54.4mm, or about 2.14 inches around.
Can I measure my ring size on my phone?
Yes, several AR-based apps use your phone camera to estimate ring size, though results are less precise than a physical measurement.
Is there a virtual ring sizer?
Many jewelry retailers offer virtual or app-based sizers online, but a printed paper sizer or string measurement remains more reliable.
What ring size am I if my finger is 2.5 inches around?
A 2.5-inch circumference, about 63.5mm, lines up closest to a US ring size 10 to 10.5.
Can I measure my ring size from home?
Yes, using string, paper, or an existing ring against a printable ring size chart works well without visiting a store.
Can an iPhone measure ring size?
An iPhone can run certain AR sizing apps for a rough estimate, but pairing it with a manual string measurement gives a more accurate result.
What is the average women’s ring size?
The average women’s ring size in the US falls between size 5 and size 7, with size 6 being the most common.
What is 7 cm in ring size?
A 7cm, or 70mm, circumference is quite large, converting to roughly a US ring size 13 to 13.5.