Follow these directions to measure your finger. They will give an approximate guide to establish your ring size. For a completely accurate measurement go to a jeweller and have your finger sized precisely.
For the most accurate reading using this method measure the finger at the end of the day when the finger is the largest.
Here are some tips to make your ring size measurement more accurate:
UK Ring Size - Measurement
G – 45.5mm
H – 46.7mm
I – 48mm
J – 48.7mm
K – 49.9mm
L – 51.2mm
M – 52.5mm
N – 53.8mm
O – 55mm
P – 56.3mm
Q – 57.6mm
R – 58.9mm
S – 60.1mm
T – 61.4mm
U – 62.7mm
V – 64mm
W – 65.2mm
X – 66.5mm