Question 1

How do I measure my ring size at home?

Accepted Answer

Two reliable methods: 1) Use a strip of paper or string, wrap it around the base of your finger, mark where it overlaps, then measure the length in millimeters. Divide by π (3.14) to get the inner diameter, then use the chart. 2) Use an existing well-fitting ring and measure its inner diameter in millimeters.

Question 2

What is the most accurate ring size system?

Accepted Answer

The most precise measurement is the inner diameter in millimeters (or circumference in mm). Country-specific size numbers are then derived. If you know your EU size, the conversion is exact; otherwise measure to 0.1 mm for best fit.

Question 3

Should I size up or down for wider bands?

Accepted Answer

Wide bands (5 mm+) often fit tighter. If you are between sizes, go a half size up for wide bands. Cold weather shrinks fingers, hot weather and evenings swell them — measure at the end of the day when fingers are largest.

Question 4

What's the difference between US and UK ring sizes?

Accepted Answer

US and Canadian ring sizes are based on the inner diameter in inches. UK sizes use a letter system (A, B, C, …). EU and most of Asia use the inner circumference in millimeters, while Japan uses the inner diameter in millimeters (close to the metric system).