Ring Sizer - Ring Size Finder

Find your ring size in seconds — no trip to the jeweler needed.

MEASURE WITH YOUR FINGER Place your finger on the screen and adjust the guide to estimate your size. Great when you don't have a ring to compare.

MEASURE WITH A RING Place a ring you already own on the screen and match the circle to the inside edge. The most accurate way to find your size at home.

EVERY SIZE SYSTEM YOU NEED See your result in US/CA, UK, JP, diameter (mm & inch), and circumference (mm) — all at once, no switching.

SCREEN-CALIBRATED ACCURACY Auto-detects your iPhone model for precise on-screen measurements.

SAVE & COMPARE Label and save measurements for yourself, a partner, or family. Come back anytime to check.

Free. No ads. No account required.