Ring Size Guide
Small measurement, big moment.
Finding the right fit is everything. Use this guide to measure your ring size at home, or find the size of someone you love.
Two Ways to Find Your Size
Use an Existing Ring
Place a ring that already fits well on our size chart and match the inner diameter to find your size. This is the quickest method.
Measure Your Finger
Wrap a thin strip of paper around your finger, mark where it meets, and measure the length in millimetres. Match the measurement to the circumference column in the chart.
How to Measure Your Finger, Step by Step
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1
Cut a thin strip of paper approximately 10cm long and 5mm wide.
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2
Wrap it snugly around the base of the finger you plan to wear the ring on.
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3
Mark where the paper overlaps with a pen or pencil.
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4
Lay it flat and measure the length in millimetres. This is your circumference.
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5
Find your size in the circumference column of the chart below.
Tips for an Accurate Measurement
Measure when warm
Fingers are smallest when cold. Measure at room temperature or slightly warm for the most accurate result.
Measure at the end of the day
Fingers are at their largest in the evening. Avoid measuring first thing in the morning.
Snug, not tight
The ring should slide over your knuckle with slight resistance and sit comfortably without spinning freely.
Consider the band width
Wider bands fit more tightly. If ordering a band wider than 4mm, consider sizing up by half a size.
Correct finger only
Ring sizes vary between fingers. Always measure the specific finger the ring will be worn on.
Measure twice
Take two or three readings and use the most consistent result. If between sizes, always size up.
Ring Size Chart
All Runivi rings are sized in US sizing. Sizes highlighted are the most commonly ordered (US 6–7½). If you wear an international size, use the conversion columns to find your US equivalent.
| US Size | Diameter (mm) | Circumference (mm) | UK / AU | Europe | Japan / Asia |
|---|---|---|---|---|---|
| 4 | 14.9 | 46.8 | H½ | 47 | 7 |
| 4½ | 15.3 | 48.0 | I½ | 48 | 8 |
| 5 | 15.7 | 49.3 | J½ | 49 | 9 |
| 5½ | 16.1 | 50.6 | K½ | 51 | 10 |
| 6 | 16.5 | 51.9 | L½ | 52 | 11 ✔ |
| 6½ | 16.9 | 53.1 | M½ | 53 | 12 ✔ |
| 7 | 17.3 | 54.4 | N½ | 54 | 13 ✔ |
| 7½ | 17.7 | 55.7 | O½ | 56 | 14 ✔ |
| 8 | 18.1 | 57.0 | P½ | 57 | 15 |
| 8½ | 18.5 | 58.3 | Q½ | 58 | 16 |
| 9 | 18.9 | 59.5 | R½ | 60 | 17 |
| 9½ | 19.4 | 60.8 | S½ | 61 | 18 |
| 10 | 19.8 | 62.1 | T½ | 62 | 19 |
| 10½ | 20.2 | 63.4 | U½ | 63 | 20 |
| 11 | 20.6 | 64.7 | V½ | 65 | 21 |
| 11½ | 21.0 | 66.0 | W½ | 66 | 22 |
| 12 | 21.4 | 67.2 | X½ | 67 | 23 |
| 13 | 22.2 | 69.8 | Z | 70 | 25 |
✔ Most commonly ordered sizes: US 6, 6½, 7, 7½
Finding the Size of Someone You Love
Buying a surprise ring? Here are the most discreet ways to find the right size without giving anything away.
Borrow a ring they already wear
Take a ring they wear on the correct finger and compare the inner diameter to the chart above.
Ask someone close to them
A friend, sibling, or parent may already know — or be happy to find out discreetly on your behalf.
When in doubt, size up
It is easier to size a ring down than up. If you are unsure between two sizes, always choose the larger one.
Don't worry, we can resize
Our complimentary resizing service means you can always get it exactly right after the moment.
Resizing Policy
Complimentary Resize
One free resize within 30 days of your ship date, including return and redelivery shipping. Up or down by up to one full size.
Eternity Bands
Cannot be resized. If the size is incorrect, we will remake the ring in the correct size at no charge within 30 days.
After 30 Days
Handled on a case-by-case basis. Please email hello@runivi.com to discuss options.
How to Request
Email hello@runivi.com with your order number and the new size needed. We will send a prepaid return label within 1–2 business days.
Not Sure of Your Size?
Our team is here to help. Send us a message and we'll guide you to the right fit before you order.