Ring Size Standards Overview

Different regions use different ring size standards. Conversions are approximate and can vary by manufacturer.

• US/CA (United States and Canada): Numeric scale with half and quarter sizes (e.g., 6, 6.25).
• UK/AU (United Kingdom and Australia): Alphabetic scale with half-steps (e.g., M, M½).
• EU/FR/DE/ES (Europe, France, Germany, and Spain): Metric system based on inner circumference in mm (e.g., 52, 54).
• Central Europe (Latin): Used in Italy (IT), Switzerland (CH), Spain (ES), Poland (PL), Netherlands (NL), Austria (AT), Czech Republic (CZ) and Slovakia (SK); size = inner circumference (mm) − 40 (e.g., 54 mm → Size 14).
• JP/SG/TW (Japan, Singapore, and Taiwan): "International Size" numeric scale widely seen in Asian markets (e.g., 12, 14).
• IN/PK/BD (India, Pakistan, and Bangladesh): Numeric scale widely used in South Asia.
• HK (Hong Kong): Local jeweler numeric scale; may include fractional/range steps (e.g., 15, 16).
• RU (Russia): Size is based on inner diameter in mm. In retail it's often shown in 0.5 steps (e.g., 17, 17.5, 18), but our chart lists more precise reference values (may include decimals) for comparison.
• BR (Brazil): Local numeric scale with its own rounding/labeling conventions, distinct from EU sizes (e.g., 14, 15).
• TR (Turkey local): Local offset/rounding conventions; may differ by chart (e.g., 14, 15). Often referred to as the Numara system in Turkey.

• Manufacturing tolerances and brand-specific charts.
• Ring width and profile (wide bands feel tighter).
• Finger changes with temperature, time of day, and hydration.
• Rounding between systems and half/quarter sizes.

• Measure at the end of the day when fingers are warm.
• Calibrate your screen before measuring for best accuracy.
• If between sizes, consider comfort-fit and band width.
• When possible, confirm with a jeweler or a physical sizer.

Our tools provide a best-effort estimate based on international conversions. Use it as guidance, not a guaranteed fit.