UK Ring Size Guide: How to Measure Your Ring Size at Home (with Conversion Chart)
To find your ring size at home, wrap a strip of paper around the base of your finger, mark where it overlaps, and measure the length in millimetres. That number is your finger's circumference, which matches the EU size. Then use the chart below to convert it to a UK letter size: for example, 51 mm = UK L and 54 mm = UK N.
Measure at the end of the day when your fingers are warm, make sure the ring will pass over your knuckle, and if you are between sizes, choose the larger one.
UK, US and EU ring size conversion chart
The UK uses letters, the US uses numbers and most of Europe uses the inside circumference in millimetres. This chart matches the sizes used on Amber James ring listings. Inner diameter is rounded to one decimal place.
| UK size | US size | EU size / circumference (mm) | Inner diameter (mm, approx.) |
|---|---|---|---|
| G | 3.5 | 45 | 14.3 |
| H | 4 | 46 | 14.6 |
| I | 4.5 | 48 | 15.3 |
| J | 5 | 49 | 15.6 |
| K | 5.5 | 50 | 15.9 |
| L | 6 | 51 | 16.2 |
| M | 6.5 | 52 | 16.6 |
| N | 7 | 54 | 17.2 |
| O | 7.5 | 56 | 17.8 |
| P | 8 | 57 | 18.1 |
| Q | 8.5 | 58 | 18.5 |
| R | 9 | 59 | 18.8 |
| S | 9.5 | 60 | 19.1 |
| T | 10 | 62 | 19.7 |
3 easy ways to measure your ring size at home
Method 1: Paper strip or string
- Cut a thin strip of paper (about 5 mm wide) or use non-stretchy string.
- Wrap it around the base of the finger you want to wear the ring on. It should be snug but not tight.
- Mark where the end overlaps with a pen.
- Lay it flat and measure from the end to the mark in millimetres.
- Check the knuckle. Slide the loop over your knuckle. If it won't pass, use the knuckle measurement instead.
- Match the number to the EU / circumference column in the chart.
Method 2: Measure a ring that already fits
Place a ring that fits the same finger on a ruler and measure the inside diameter straight across the widest point, in millimetres. Match it to the inner diameter column above. This is the most reliable at-home method because it reflects a fit you already know is comfortable.
Method 3: Use a ring sizer or visit a jeweller
A reusable plastic ring sizer is inexpensive and more accurate than paper. Any high street jeweller can also measure you with a set of sizing rings in seconds, usually free of charge.
Tips for an accurate measurement
- Measure at the end of the day. Fingers are often slightly larger in the evening and when warm.
- Avoid measuring when cold. Cold fingers shrink and can make you size down by mistake.
- Measure two or three times and use the most common result.
- Mind your knuckles. If your knuckle is much wider than the base of your finger, size for the knuckle so the ring can go on.
- Wide bands fit tighter. For bands wider than about 6 mm, many people go up half a size.
- Each hand is different. Your dominant hand is often slightly larger, so measure the finger you will actually wear the ring on.
Rings in the Amber James collection
Our sized rings use the UK, US and EU sizes shown in the chart, so you can choose with confidence. Several styles are made from 925 sterling silver, as noted below.
Heliana Circle Stacking RingA dainty 925 sterling silver circle ring, ideal for everyday wear and stacking. Available in UK J to UK S.
View Heliana ring →
Kyla 1ct Solitaire RingA 1ct round solitaire in polished 925 sterling silver, in one of our widest size ranges, from UK G to UK T.
View Kyla ring →
Trinity Three Stone RingThree round stones totalling 1.5ctw on a sleek band. Available in UK H to UK T.
View Trinity ring →
Bridget Infinity Stacking RingA looping infinity design that layers beautifully with plain bands.
View Bridget ring →
Alexia Adjustable Crossover RingHand-crafted from 925 sterling silver with an adjustable crossover design. Wear it as a thumb, midi or stacking ring.
View Alexia ring →
Anna Knuckle Ring SetA set of 925 sterling silver knuckle and midi rings for layering across the fingers.
View Anna set →
Buying a ring as a surprise gift?
- Borrow a ring she wears on the same finger and measure its inside diameter.
- Trace the inside of one of her rings on paper if you can't take it away.
- Ask a friend or family member who may know her size.
- Choose an adjustable ring, such as the Alexia crossover ring, or earrings or a necklace instead to avoid sizing altogether.
- Check the returns policy. Amber James offers a 30-day return window on unworn items in their original packaging.
What is the most common women's ring size in the UK?
Many women in the UK wear between UK L and UK N (US 6 to 7), with UK M often quoted as a typical size. Use this only as a starting point: finger sizes vary widely, so measuring is always more reliable than guessing.
Frequently asked questions
How do I measure my ring size at home in the UK?
Wrap a strip of paper around the base of your finger, mark where it overlaps, and measure the length in millimetres. Match that circumference to a UK letter size using a conversion chart. For example, 52 mm is UK M.
What ring size is 54 mm?
A 54 mm inside circumference is UK N, US 7 and EU 54, with an inner diameter of about 17.2 mm.
Should I size up or down if I am between sizes?
Size up. A slightly larger ring is more comfortable, especially in warm weather, and is easier to adjust than a ring that is too tight.
Do wide rings need a bigger size?
Often, yes. Bands wider than about 6 mm cover more of the finger and feel tighter, so many people choose half a size larger.
Is UK ring size the same as US?
No. The UK uses letters and the US uses numbers. For example, UK L is US 6 and UK N is US 7. Use a conversion chart to switch between them.
Key takeaways
- Measure your finger's circumference in millimetres and convert it with the chart.
- The most accurate at-home method is measuring a ring that already fits.
- Measure at the end of the day with warm hands, and check it fits over the knuckle.
- If you are between sizes or choosing a wide band, go up half a size.
- For surprise gifts, an adjustable ring removes the guesswork.
Ready to choose? Explore our sterling silver rings.
