method a:
How To Measure Your Ring
You'll need a thin strip of paper or a piece of string (approx 10cm long).
- Wrap the paper/string around your finger base and mark where the ends meet.
- Lay it flat, measure the marked length in millimetres and use the size chart below.
method b:
How To Measure an Existing Ring That Fits
This method is especially useful if you're buying for a loved one, or want to avoid taking measurements directly from a finger.
- Place the ring flat on a surface.
- Use a ruler to measure the inside diameter (in millimetres).
- Match your measurement to the chart below to find the matching size.
| Inches | MM | UK Ring Size | US | EU |
|---|---|---|---|---|
| 0.52 | 12.84 | D | 2.23 | 41 |
| 0.53 | 13.57 | E | 2.75 | 42 |
| 0.55 | 13.97 | F | 3.25 | 44 |
| 0.56 | 14.38 | G | 3.75 | 45 |
| 0.58 | 14.88 | H | 4.25 | 46.5 |
| 0.59 | 15.10 | I | 4.5 | 47 |
| 0.60 | 15.49 | J | 5 | 48.5 |
| 0.62 | 15.90 | K | 5.5 | 50 |
| 0.64 | 16.31 | L | 6 | 51 |
| 0.65 | 16.71 | M | 6.5 | 52 |
| 0.67 | 17.12 | N | 6.75 | 53.5 |
| 0.69 | 17.53 | O | 7 | 55 |
| 0.70 | 17.96 | P | 7.5 | 56 |
| 0.72 | 18.34 | Q | 8 | 57 |
| 0.73 | 18.75 | R | 8.5 | 58.5 |
Why Accurate Ring Sizing Matters
A ring that’s too tight can restrict movement or cause discomfort. Too loose - it can slip off and be lost.
Wider bands fit more snugly, so often require a slightly larger size for comfort.
Finger size fluctuates: temperature, water retention, time of day, and dominant hand all influence fit.
For rings with gemstones or comfort-fit designs, precise sizing ensures stones stay secure, the setting remains stable, and the ring sits correctly.
Frequently Asked Questions
Can a finger size change?
Yes - temperature, activity, time of day and even weather can cause fluctuations. That's why we recommend measuring at the end of the day and avoiding times when fingers are cold
My knuckle is wider than the base of my finger - what do I do?
Measure both knuckle and base circumference. Choose a size between the two or go for a "comfort fit" ring that's easier to slide over the knuckle.
I'm between sizes - should I go up or down?
Go up. It's easier to resize or adjust a slightly large ring than to stretch a tight one.
Are sizing systems the same worldwide?
No. UK uses letters, US uses numbers, and EU uses millimetres. That's why a reliable conversion chart is essential when buying internationally.
Printable Ring Sizer & Downloadable Chart
For ease and accuracy, you can download our 100% scale printable ring sizer (PDF) – use it to measure your finger or check a ring you already own. Perfect for gifts, surprise orders or precise sizing.
(Ensure your printer settings are "no scaling" and you print at 100% - any resizing will make the chart inaccurate.)