I already have a ring that fits

Nice one! Now you just need to measure it.

There are a few ways to go about this. Whichever method you use, be as precise as possible, when it comes to finger sizes, small amounts matter.

If the ring you're measuring isn't the same width as the one you're ordering, make sure you take this into account. Check out DOES THE WIDTH AFFECT THE SIZE.

USING OUR PRINTABLE RING SIZER

No special tools? Print out and follow our Printable Ring Sizer.

USING CALLIPERS

Make sure you measure to the nearest 0.1mm. The callipers below show an internal diameter of 16.5mm or US size 6.  

To convert your internal diameter to a ring size see our Ring Size Conversion Chart.

USING A RING SIZING MANDREL

Make sure you measure to the edge of the ring, not the centre. 

Measured to the edge, the ring below is sized US 6 or UK L ½ but measured to the centre it would be US 5¾ or UK L (aka too small).

USING A RULER

(In our opinion) this isn’t a very good idea, it’s just too hard to be accurate enough.