Free iPhone ring sizer app: measure a ring on screen, measure finger width, convert US, UK, EU, JP and letter sizes, and save sizes in seconds.
5.84k+ downloads · 4.8 stars
Updated iPhone interface
The updated app keeps ring measurement, finger measurement, conversion, and saved sizes cleanly connected.
Measure a ring, measure a finger, convert standards, and save sizes without visiting a jeweler.
Ring Measurement
Place a ring on the circle and adjust the guide until the inner edge matches.
Saved Sizes
Keep important ring sizes ready for yourself, family, partners, and gift planning.
Global Size Standards
Convert between US, UK, EU, Japan, Australia, India, and millimeter measurements.
Finger Width Mode
No ring? Measure your finger directly across the on-screen bar and fine-tune the millimeter value.
Offline & Private
Works fully offline. Your data never leaves your device. Zero tracking.
Instant Results
Your size appears immediately in all major standards — US, UK, EU, and more.
Engagement Ready
Planning a surprise proposal? Secretly measure a ring while they're away.
Size History
Track how your ring size changes over time with measurement history.
Clean iPhone UI
Large controls, clear rulers, and focused sheets make each sizing task easy to follow.
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If you prefer complex moral dilemmas, heavy philosophical themes, and high-intensity suspense, these psychological masterpieces are essential. Attack on Titan (Shingeki no Kyojin) Completed Manga Status: Completed
Naoki Urasawa’s Monster is a slow-burn psychological masterpiece. It lacks traditional anime tropes, opting instead for a gritty, realistic, and deeply unsettling cat-and-mouse chase across a post-Cold War Europe. Romance and Slice-of-Life (Comfort Picks) komik hentai tsunade x kakashi updated
Produced by MAPPA, the anime features choreography that is fast, brutal, and brilliantly scored.
Action, Comedy, Superhero The Vibe: What if Superman was bored and broke? Why Read: Saitama is a hero who can defeat any enemy with a single punch. While the premise sounds silly, the manga evolves into a stunning critique of the superhero genre. The artwork by Yusuke Murata is arguably some of the best in the industry—action scenes flow with a fluidity that makes the pages feel like they are moving. Whether you’re a seasoned "otaku" or someone who
Dr. Kenzo Tenma, a brilliant Japanese brain surgeon working in Germany, chooses to save the life of a young boy over a wealthy politician. Years later, Tenma discovers that the boy he saved has grown up to become a charismatic, psychopathic serial killer.
: A generational story of a family with extraordinary powers. Attack on Titan (Shingeki no Kyojin) Completed Manga
Which of these genres— or psychological thrillers —sounds more like your next binge-watch?
No jeweler visit. No guesswork. Just your phone.
Choose a Mode
Measure an existing ring on the circle, or switch to finger width mode when no ring is available.
Align the Guide
Use the ruler, slider, and plus/minus controls to match the ring or finger width precisely.
Save or Convert
See the measurement instantly, save it for later, or convert it between international standards.
Buy jewelry anywhere in the world with confidence.
US
& Canada
UK
& Australia
EU
Europe
JP
Japan
IN
India
mm
Diameter
Ring Sizer works entirely offline. Your measurements never leave your device. We don't collect, share, or sell any of your data. Ever.
"Used this app to measure ring size. It's accurate and it's really helpful."
Pradep12 · App Store Review
Whether you’re a seasoned "otaku" or someone who just realized that Spirited Away wasn’t just a fever dream from childhood, the world of Japanese media is vast. With thousands of titles spanning every genre imaginable—from high-stakes supernatural battles to quiet, "slice-of-life" moments in a countryside kitchen—knowing where to start can be overwhelming.
If you prefer complex moral dilemmas, heavy philosophical themes, and high-intensity suspense, these psychological masterpieces are essential. Attack on Titan (Shingeki no Kyojin) Completed Manga Status: Completed
Naoki Urasawa’s Monster is a slow-burn psychological masterpiece. It lacks traditional anime tropes, opting instead for a gritty, realistic, and deeply unsettling cat-and-mouse chase across a post-Cold War Europe. Romance and Slice-of-Life (Comfort Picks)
Produced by MAPPA, the anime features choreography that is fast, brutal, and brilliantly scored.
Action, Comedy, Superhero The Vibe: What if Superman was bored and broke? Why Read: Saitama is a hero who can defeat any enemy with a single punch. While the premise sounds silly, the manga evolves into a stunning critique of the superhero genre. The artwork by Yusuke Murata is arguably some of the best in the industry—action scenes flow with a fluidity that makes the pages feel like they are moving.
Dr. Kenzo Tenma, a brilliant Japanese brain surgeon working in Germany, chooses to save the life of a young boy over a wealthy politician. Years later, Tenma discovers that the boy he saved has grown up to become a charismatic, psychopathic serial killer.
: A generational story of a family with extraordinary powers.
Which of these genres— or psychological thrillers —sounds more like your next binge-watch?
Guides, tools, and charts to help you find the perfect fit.
Ring Size Chart
Complete conversion chart for US, UK, EU, Japan, and Australian ring sizes with diameter in mm.
How to Measure Ring Size at Home
5 free methods to find your ring size without visiting a jeweler — app, string, paper strip, and more.
Ring Size Calculator
Enter your ring diameter or circumference to instantly find your size in every international standard.
UK Ring Sizes (A–Z)
British letter-based sizing guide with full chart, Hatton Garden tips, and UK to US conversion.
Men's Ring Size Guide
Average men's ring sizes, measurement tips, and a complete chart for wedding bands and signet rings.
Secret Engagement Ring Sizing
How to find your partner's ring size without them knowing — clever tips for surprise proposals.
Free to download. Works on iPhone. No tools needed.
