Ring Size Charts — US, UK, EU, cm & Printable

Charts answer 'what size is this measurement?' — this cluster has every form of the question: the full US table, the cm view, the men's range with wide-band corrections, a printable calibrated sizer, and the converter that translates between all six national systems. Every chart on this site computes its rows from one formula — circumference = 2.55 × US size + 36.5 mm — so the columns agree with each other instead of drifting the way copied-and-recopied charts do. Key anchors to orient yourself: US 6 = 51.8 mm (UK L½), US 7 = 54.4 mm (N½), US 8 = 56.9 mm (P½), and 7 cm of circumference = US 13¼. If you already have a measurement, start with the full chart or the cm chart; if you have a size in someone else's system, start with the conversion tool; if you need a physical sizer tonight, the printable page verifies its own scale with a credit-card box before you trust it.