Ring Sizer - Ring Size Finder
Find Your Ring Size Fast
About
Easily determine your ring size at home using your finger or an existing ring. Get results in multiple international sizing systems instantly. Save your measurements for future reference.
What's New in Ring Sizer
1.1
March 21, 2026
Bug fixes and improvements.
Developer apps
FAQ
How does Ring Sizer measure my ring size?
Ring Sizer offers two methods: placing your finger on the screen and adjusting a guide, or placing an existing ring on the screen and matching its inner edge to a circle. The app auto-detects your iPhone model for precise on-screen measurements.
What ring size systems does Ring Sizer support?
Ring Sizer displays results in US/CA, UK, JP, diameter (mm & inch), and circumference (mm) all at once, eliminating the need to switch between different systems.
Can I save my ring size measurements with Ring Sizer?
Yes, you can label and save measurements for yourself, a partner, or family members. You can revisit these saved measurements anytime.
Is Ring Sizer accurate?
The app is designed for screen-calibrated accuracy and auto-detects your iPhone model to enhance precision. Measuring with an existing ring is noted as the most accurate method.
Does Ring Sizer have ads?
No, Ring Sizer is completely free with no advertisements. It also does not require an account to use.
What devices is Ring Sizer available on?
Ring Sizer is currently supported on iPhone devices.
How often is Ring Sizer updated?
The app was last updated on March 21, 2026, indicating recent development and support. The latest version is 1.1.
What is the age rating for Ring Sizer?
Ring Sizer has an age rating of 4+, making it suitable for a wide range of users.