SizeMyRing: Ring Sizer

Jeweler-grade ring size in under two minutes — measure with a ring, finger, photo or string, then convert to US, UK, EU, JP & Swiss sizes. Private, no account.

Find any ring size in under two minutes — no jeweler, no guesswork.

SizeMyRing turns your iPhone into a precise ring-sizing instrument. Measure four ways, get every international size at once, and save it forever.

MEASURE HOW YOU LIKE • Ring on screen — lay a ring on the display and match the glowing circle to its inner edge. • Finger on screen — set two bars to the width of your finger. • Camera — photograph a ring or hand next to any bank card for scale. • String or paper — the classic wrap-and-measure, guided step by step.

EVERY STANDARD, INSTANTLY See US/Canada, UK/Australia, EU (ISO), Japan/China and Swiss sizes together, plus exact inner diameter and circumference in millimetres. A built-in converter and full size chart are included.

PERFECT FOR GIFTS Gift Mode measures a partner's ring discreetly in about 60 seconds — ideal for engagement rings. Save sizes for the whole family so you're ready for every birthday and anniversary.

ACCURATE & PRIVATE Calibrate the screen with any standard payment card to make on-screen measurement jeweler-grade. Everything is measured and stored on your device — no account, and photos never leave your iPhone.

SIZEMYRING PREMIUM Unlock unlimited measurements, every tool, unlimited saved people, PDF chart export and jeweler-ready sharing. Choose a weekly plan with a 3-day free trial, an annual plan, or a one-time lifetime purchase.

Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel anytime in your App Store account settings.

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