The complete guide on how to find your ring size โ 5 easy at-home methods, paper strip technique, string method, measure an existing ring, UK size chart, men's & women's averages & free calculator
The most accurate way to find your ring size at home is to measure an existing well-fitting ring with a ruler. If you don't have one, the paper strip method is the next best option. Always measure at the end of the day, size up for wide bands, and check over the knuckle.
Wrap a strip of paper around your finger, mark the overlap, measure in mm and match to the UK size chart. No tools needed.
Wrap string or dental floss around your finger, mark the length, then lay flat and measure in mm. Works the same as the paper method.
Place a well-fitting ring on a ruler and measure the inner diameter in mm. Match to the chart for instant, highly accurate sizing.
Use a digital calliper to measure the inner diameter of an existing ring to 0.1 mm accuracy. Best for people between sizes.
Any UK high-street jeweller (H.Samuel, Beaverbrooks, Goldsmiths, Ernest Jones) will size your finger free of charge using a ring mandrel.
Many UK jewellers offer a free printable ring sizer on A4 paper. Print at 100% scale, cut it out and wrap around your finger to find your size.
Cut a strip approximately 10 cm long and 0.5 cm wide. It must be non-stretchy โ use regular printer paper or card. Avoid tissue paper or foil.
Wrap the strip around the base of the finger where you intend to wear the ring. It should sit snug but not tight โ you should be able to slide it slightly but it should not fall off.
Use a pen or pencil to mark clearly where the paper meets itself. Do not guess โ a precise mark gives a precise result.
Lay the paper flat on a ruler and measure from the end to the mark in millimetres. This measurement is your finger circumference. Write it down.
Find your circumference measurement in the chart below. If you fall between two sizes, always choose the larger size for a comfortable fit.
Make sure the paper also passes over your knuckle comfortably. If your knuckle is wider, measure the knuckle too and size between the two measurements.
Select a ring you already own that fits the specific finger and hand you want the new ring for. Do not use a ring that is loose or tight.
Lay the ring on a white piece of paper or a ruler so you can see clearly across the inside opening.
Measure straight across the inside of the ring at its widest point using a mm ruler or digital calliper. This is your inner diameter.
Find your diameter measurement in the Diam. (mm) column of the chart below to identify your UK ring size immediately. No calculation needed.
Measuring an existing ring gives you a direct physical measurement of the exact size that already fits your finger. Unlike wrapping paper or string, there is no margin for wrapping tension error. It is especially reliable for surprise purchases โ if your partner has a ring they wear regularly on that finger, this method will give you their exact UK size without them knowing.
| UK Size | Diam. (mm) | Circ. (mm) | ๐บ๐ธ US Size | ๐ช๐บ EU Size | Best For | Notes |
|---|---|---|---|---|---|---|
| A | 12.04 mm | 37.80 mm | โ | 37 | Children / XS | Smallest UK size |
| B | 12.45 mm | 39.10 mm | 1 | 38 | Children / XS | โ |
| C | 12.85 mm | 40.40 mm | 1.5 | 40 | XS Women | โ |
| D | 13.26 mm | 41.70 mm | 2 | 41 | Small Women | โ |
| E | 13.67 mm | 42.90 mm | 2.5 | 42 | Small Women | โ |
| F | 14.07 mm | 44.20 mm | 3 | 43 | Small Women | โ |
| G | 14.48 mm | 45.50 mm | 3.5 | 45 | Women | โ |
| H | 14.88 mm | 46.80 mm | 4 | 46 | Women | โ |
| I | 15.29 mm | 48.00 mm | 4.5 | 47 | Women | โ |
| J | 15.49 mm | 48.70 mm | 4.75 | 48 | Women | โ |
| K | 15.90 mm | 50.00 mm | 5 | 49 | Women | โ |
| L | 16.31 mm | 51.20 mm | 5.5 | 50 | Women | โ |
| M | 16.71 mm | 52.50 mm | 6 | 51 | Women | โ |
| N โญ | 17.12 mm | 53.80 mm | 6.5 | 52 | Women's Avg โญ | UK average women |
| O โญ | 17.53 mm | 55.10 mm | 7 | 54 | Women Popular | โ |
| P โญ | 17.93 mm | 56.30 mm | 7.5 | 55 | Women Popular | โ |
| Q | 18.34 mm | 57.60 mm | 8 | 57 | Slim Men | โ |
| R | 18.75 mm | 58.90 mm | 8.5 | 58 | Lean Men | โ |
| S | 19.15 mm | 60.20 mm | 9 | 60 | Average Slim Men | โ |
| T โญ | 19.56 mm | 61.40 mm | 9.5 | 61 | Men's Avg โญ | UK average men |
| U โญ | 19.96 mm | 62.70 mm | 10 | 63 | Men Popular | โ |
| V โญ | 20.37 mm | 64.00 mm | 10.5 | 64 | Men Popular | โ |
| W | 20.78 mm | 65.30 mm | 11 | 65 | Athletic Men | โ |
| X | 21.18 mm | 66.60 mm | 11.5 | 67 | Broad Men | โ |
| Y | 21.59 mm | 67.80 mm | 12 | 68 | Large Build | โ |
| Z | 21.79 mm | 68.50 mm | 12.5 | 69 | XL Build | โ |
| Z+1 | 22.20 mm | 69.70 mm | 13 | 70 | XL Custom | โ |
| Z+2 | 23.01 mm | 72.30 mm | 13.5 | 72 | Custom | Largest standard UK size |
The most accurate secret method. Borrow it for a few hours, measure the inner diameter in mm, then return it. Even one measurement is enough.
Press the ring into a bar of soap or Blu-Tack to make an impression. Measure the impression's inner diameter carefully with a ruler.
A trusted friend, sister, or parent may already know or can casually find out. Many have been through ring shopping themselves and know exactly the right size.
Try one of their rings on your own finger. Note which of your knuckles it reaches and ask a jeweller to measure that knuckle. Good for a rough estimate.
Photograph their ring next to a ruler or coin of known size. Send the photo to a UK jeweller who can estimate the ring's inner diameter from the image.
Buy a ring in UK N (women's average) or UK T (men's average) and have it resized after the proposal. Most UK jewellers resize within 1โ2 weeks for a small fee.