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How to find the ring size at home

The safest way to find out the exact size of your finger is in the presence of a jeweler. If you can’t do this, there are many other ways you can approximate it.

Find a thin strip of paper or piece of string. Wrap it around the finger. With a pen, mark the point on the paper or string where it overlaps. Using a flat ruler, measure the length of the paper string from the starting point to the pen mark.

You cand also use this metod with the inner circumference (French Sizes scale), if you have an old ring.


Use the international ring size conversion table to find the matching size: 
 Interior
Diameter (mm)
Inside
Circumference (mm)
USA
Canada
Mexico
UK
Australia
Ireland
Italy
Spain
Switzerland
China Japan
South America
       
113.06411 
213.26422D1.752
313.6743E33
413.87443.5 
514.27454.755
614.684666
715.09477.5 
815.2948I88
915.4949J8.75 
1015.950K10 
1116.3151L11.25 
1216.5152611.7511
1316.925313.2513
1417.3254714.514
1517.5355O15 
1617.9356P16.25 
1718.145781716
1818.545818.2517
1918.7559R19 
2019.1560S20.25 
2119.356120.7519
2219.7662102220
2319.966310¼U22.7521
2420.376410¾V24 
2520.57651124.7523
2620.986611½2624
2721.39671227.2525
2821.596812¼Y27.75 
29226912¾29 
3022.27013 29.7527
3122.617113½ 31 
3222.817213¾Z231.75 
3323.227314¼ 33 
3423.627414¾ 34.25 
3523.837515 34.75 
3624.237615½ 36.25 

Measure your finger at the end of the day.
Your finger size changes depending on the weather and time of day. For best results, measure your finger size at the end of the day when your fingers are warm (early in the morning, your fingers are cold and therefore smaller).