Ring Sizer: Size & Measure

Measure ring size on your iPhone ring on screen, finger ruler, or printable strip. US quarter calibration. US, UK, EU & JP sizes. Free to try.

Ring Sizer helps you estimate ring size at home on your iPhone no jeweler visit required.

Whether you're shopping for an engagement ring, wedding band, or gift, Ring Sizer is a ring size finder, ring size chart, and ring size converter in one app.

THREE WAYS TO MEASURE • Ring Sizer — place a ring on screen and match the inner edge • Finger Sizer — use the on-screen ruler at the knuckle • Print & Measure — print a calibrated strip (Pro) and enter the mm reading

INTERNATIONAL SIZE CHART See US, UK, European, Japanese, and Chinese sizes at once — with diameter and circumference in millimeters.

BUILT FOR REAL SHOPPING • US quarter screen calibration for better accuracy • Between-sizes guidance when you're between two sizes • Discreet mode for surprise proposals • Share your size via text

RING SIZER PRO • Printable calibrated sizing strip • Save unlimited ring sizes • Jeweler-ready PDF export

Results are estimates — confirm with a jeweler or ring mandrel before ordering.

Core ring sizing is free to try. •⁠ ⁠Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ •⁠ ⁠Privacy Policy: https://docs.google.com/document/d/1Y4Mhhyeza2RJlpv2dAGQ2yM7A4Lisr6Y8B_jnYcvg-c/edit?usp=sharing