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Measuring Your Ring Size

How to measure for a ring.

Once you have chosen your Pia ring, you will want to make sure you are buying the correct size. At Pia we use UK ring sizes. Most of our rings come in sizes L,N,P,R and T, however some styles vary and can be available in a K or S.

To find out your ring size you can either follow the simple instructions below, or ask us to send you one of our FREE Ring Sizers. If you'd like to request a FREE Ring Sizer please call us on 0844 499 7130 or email us at service@piajewellery.com.

You can measure your finger in two different ways:

Measuring circumference

  • Use a measuring tape no wider than 2cm.
    Do not use a piece of string or thread as this will follow the contours of your finger too closely and record an incorrect size.
  • Measure the circumference of your finger by wrapping the measuring tape around your finger, ensuring it slides easily over the knuckle. Using a pen, mark the tape at the point where it overlaps.
  • Now measure the length in millimetres from the start of the tape to the pen mark, using a ruler.
  • Compare this measurement against the chart below to see whether we stock a ring to fit your size.
  • Top tip: always measure your finger at room temperature. If the conditions are too cold your finger will be smaller; if too hot your finger will be larger.

Measuring diameter

This method only works if you have a ring that already fits the same finger.

  • Use a ruler to measure across the inside edge of the ring in millimetres.
  • Compare this measurement against the chart below to determine whether we stock a ring to fit your size.


  • Check another ring for that finger against our ring size diagram.
  • Important: when you print, please ensure that your printer is set to print without scaling, otherwise the sizes will not be accurate!

Pia ring size measurements:

UK size Circumference in mm
(Measurement around inside of ring)
Diameter in mm
(Measurement across inside of ring)
Europe Equivalent US Equivalent
K 49.95 15.80 50 5 1/2
L 51.25 16.10 52 6
N 53.75 16.90 54 7
P 56.25 17.80 56 8
R 58.75 18.60 59 9
S 60.35 19.10 60.5 9.5
T 61.25 19.50 62 10

If you have any questions, or need advice, please do not hesitate to talk to one of our friendly team.

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