Ring Sizer - Ring Size Finder
Find Your Ring Size Fast
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
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.
Ratings & Reviews
Bug fixes and improvements.
The developer, 100 Factories, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- 100 Factories
- Size
- 3.3 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 100 Factories.