Ring Sizes
UK Ring Sizes
The UK uses a system of letters, plus a fraction - e.g. a, a 1/2, b etc. The closer the letter to the end of the alphabet, the larger the ring size. Once you get to 'z', the UK ring sizes start adding on extra sizes with a '+' symbol followed by a number - e.g. z+3, z+3.5 etc. Note that this system is also used in Australia, New Zealand, Ireland and South Africa
UK Ring Size Diameters:
I - 15.22mm
J - 15.61mm
K - 16.00mm
L - 16.40mm
M - 16.79mm
N- 17.18mm
O - 17.58mm
P - 17.97mm
Q - 18.36mm
R - 18.76mm
S - 19.15mm
T - 19.55mm
U - 19.94mm
V - 20.33mm
W - 20.73mm
X - 21.12mm
Y - 21.51mm
Z - 21.91mm
US & Canadian Ring Sizes
You might also come across US ring sizes, which are also used in Canada. These are made up of numbers only, starting at '0000', '000', '00', '0', '1/2', '3/4' '1'; going up to '13.5'. The US system of ring sizes goes smaller than the UK, covering sizes all the way down to 31.33mm in circumference. However, the UK system covers larger sizes at the opposite end of the scale.
Asian Ring Sizes
The Asian ring size is used across the entire continent, including India, China and the Middle East (though not Hong Kong, confusingly!). This scale is also used in some South American countries such as Peru and Bolivia. It's the simplest to figure out as it's literally just a case of counting up 1, 2, 3 - there's no fractions or letters to deal with! However, this means it covers fewer sizes than some of the other scales.
Please Note: the best time of day to measure is in the evening, when your fingers are largest. Avoid measuring when you’re cold, as fingers are at least half a size smaller.
The UK uses a system of letters, plus a fraction - e.g. a, a 1/2, b etc. The closer the letter to the end of the alphabet, the larger the ring size. Once you get to 'z', the UK ring sizes start adding on extra sizes with a '+' symbol followed by a number - e.g. z+3, z+3.5 etc. Note that this system is also used in Australia, New Zealand, Ireland and South Africa
UK Ring Size Diameters:
I - 15.22mm
J - 15.61mm
K - 16.00mm
L - 16.40mm
M - 16.79mm
N- 17.18mm
O - 17.58mm
P - 17.97mm
Q - 18.36mm
R - 18.76mm
S - 19.15mm
T - 19.55mm
U - 19.94mm
V - 20.33mm
W - 20.73mm
X - 21.12mm
Y - 21.51mm
Z - 21.91mm
US & Canadian Ring Sizes
You might also come across US ring sizes, which are also used in Canada. These are made up of numbers only, starting at '0000', '000', '00', '0', '1/2', '3/4' '1'; going up to '13.5'. The US system of ring sizes goes smaller than the UK, covering sizes all the way down to 31.33mm in circumference. However, the UK system covers larger sizes at the opposite end of the scale.
Asian Ring Sizes
The Asian ring size is used across the entire continent, including India, China and the Middle East (though not Hong Kong, confusingly!). This scale is also used in some South American countries such as Peru and Bolivia. It's the simplest to figure out as it's literally just a case of counting up 1, 2, 3 - there's no fractions or letters to deal with! However, this means it covers fewer sizes than some of the other scales.
Please Note: the best time of day to measure is in the evening, when your fingers are largest. Avoid measuring when you’re cold, as fingers are at least half a size smaller.
