Ring Size Guide - How To Measure Ring Size

In this guide

UK Ring Size Chart

Use the chart of UK measurements below to find your ring measurement. A hemline/sewing tape measure is ideal to measure. Remember to give enough leeway for the tape measure to fit over your knuckles.

Ring SizeCircumference (mm)Ring SizeCircumference (mm)Ring SizeCircumference (mm)

How to find your partners ring size

Guess it (not as crazy as it sounds):

  • Fingers are proportionate to body type so, If your partner is petite, it’s likely that their hands are smaller and slender, start at a size H or I for women, and around an N for men.
  • If they’re more average in height, chances are they have an average finger size too. An average finger size is L½ for women and Q for men.
  • If your partner is above average height or build, start at around a ring size N for a woman and a size T for men.


  • Take a ring they already wear to a jewellers for it to be sized.
  • Bear in mind that the engagement/wedding ring finger is the third finger on the left hand

Use your own finger:

  • This is our favourite, slide a ring that they already wear onto your own 'ring finger' and mark with a pen where it gets stuck. Take it to a jeweller and you'll get a very close size.


Downloadable ring size guide

Download and print our simple ring size guide and place a ring over the dotted circles and match the inner diameter to find your ring size. Our guide is perfect for when you want to surprise someone with a perfectly fitting ring.

Also included in the guide is a printable finger measuring strip to help with an accurate size. Please note that this is only a guide and won't take into account the style of your ring. For example, if you are choosing a ring with a wide band, you may need a larger size. If you're in doubt, seek help from your local jeweller.

Download the ring size guide

Browse Rings:

Helpful Ring Sizing Tips:

  • Don't worry about taking a risk to make sure your occasion goes to plan. It's about the gesture and the way you propose that counts. It is thought in the industry that around 40% of all engagement rings are resized. You can get in touch with James Porter to help with resizing.
  • Fingers expand and contract depending on the temperature. It might sound silly but bear that in mind if you're measuring a finger after walking into a jewellers after being out in the cold.
  • If your knuckle is much larger than your finger’s base, take two separate measurements of both and choose a size in between. A ring should slide over the knuckle but not be too loose to slider around the finger.
  • If you don't have a printer, you can use string or floss to wrap around a ring finger and mark it with a pet to get a length which you can then measure with a ruler. Bear in mind with this that string can stretch!

Have A Question?

Contact us by phone at 0141 221 5855 or by email at [email protected]. We love our work and will be happy to help you with your query, we can also book a convenient time for a consultation to find the exactly what you need..


Simon Porter

Director, James Porter & Son

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Simon is the 5th generation Porter to look after the day to day running of the James Porter & Son store since its inception in 1858. Working alongside his father since 1995 and eventually taking over the reins full time in 2007.

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    Engagement Ring 60 Min
    Tuesday 28 November 10:30 am


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