* Ring size conversion
JP 13 ring size conversion
JP 13 is an inside diameter of 17 mm (circumference 53.4 mm). In other systems that is US 6.5 = UK M½ = EU 53 = Japan 13.
Published July 11, 2026
JP 13 — full conversion
- Inside diameter
- 17 mm
- Inside circumference
- 53.4 mm
- Japan
- 13
- US / Canada
- 6.5
- UK / Australia
- M½
- EU (ISO)
- 53
Nearby sizes
- Ø 16.7 mm — US 6 = UK L½ = EU 52 = Japan 12
- Ø 17.3 mm — US 7 = UK N½ = EU 54 = Japan 14
Buying tips for JP 13
- Wide bands feel tighter — consider going up ~½ US size for bands over 6 mm.
- Printable paper sizers are often ¼–½ size off; prefer a metal gauge at a jeweler.
- Selling the ring for gold? Check 18K ring melt value or the karat × weight calculator.
* Frequently asked
FAQ
- Q. What is JP 13 in other ring size systems?
- A. JP 13 converts to US 6.5 = UK M½ = EU 53 = Japan 13.
- Q. What is the diameter of JP 13?
- A. Inside diameter 17 mm; inside circumference 53.4 mm.
- Q. How should I measure my finger?
- A. Measure at the end of the day when fingers are warm. The ring must clear the knuckle; if knuckle and base differ, size for the knuckle and consider a comfort-fit band.
- Q. Can every ring be resized to this size?
- A. Most gold and platinum bands can move 1–2 sizes. Tension settings, eternity bands, and some titanium/tungsten rings cannot. See a jeweler before ordering a resize.
* Try it
Identify the jewelry in your hand, right now.
Just take a photo — AI reads the metal, gemstone, hallmark, era, and an estimated value range in seconds. First three scans free with a sign-in. Nothing to install.
* Related