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.
From the "Volume" LED tech used in The Mandalorian to the cutting-edge CGI of Avatar: The Way of Water .
The influence of these popular entertainment studios and productions extends far beyond the duration of a film or an episode. They drive:
Blockbuster productions provide thousands of jobs and stimulate tourism in filming locations. BangBros Lexi Luna - Sexy Mrs. Clause Gets Her Fix
Starting as a distributor, Netflix is now one of the most prolific production houses in the world. They’ve shifted the focus toward international productions, bringing global hits like Squid Game (South Korea) and Money Heist (Spain) to the mainstream.
Universal has mastered the art of the "franchise." With the Fast & Furious saga, Jurassic World , and the world-dominating animation of ( Despicable Me , The Super Mario Bros. Movie ), Universal consistently proves that high-octane action and vibrant family fun are the keys to global appeal. The Disruption of Streaming Productions From the "Volume" LED tech used in The
As the industry continues to evolve, the line between "tech company" and "movie studio" will continue to blur. However, the core mission remains the same: to capture lightning in a bottle and share it with the world.
On the opposite end of the scale from Disney is A24. This "indie" darling has become a brand in its own right, known for producing avant-garde, artist-driven films like Everything Everywhere All At Once and Hereditary . They represent the "prestige" side of popular entertainment, proving that niche, high-concept stories can achieve massive commercial success. Animation: A League of Its Own Starting as a distributor, Netflix is now one
The landscape of entertainment studios shifted dramatically with the rise of Silicon Valley’s influence. Production is no longer confined to the traditional "Big Five" studios in Los Angeles.
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
From the "Volume" LED tech used in The Mandalorian to the cutting-edge CGI of Avatar: The Way of Water .
The influence of these popular entertainment studios and productions extends far beyond the duration of a film or an episode. They drive:
Blockbuster productions provide thousands of jobs and stimulate tourism in filming locations.
Starting as a distributor, Netflix is now one of the most prolific production houses in the world. They’ve shifted the focus toward international productions, bringing global hits like Squid Game (South Korea) and Money Heist (Spain) to the mainstream.
Universal has mastered the art of the "franchise." With the Fast & Furious saga, Jurassic World , and the world-dominating animation of ( Despicable Me , The Super Mario Bros. Movie ), Universal consistently proves that high-octane action and vibrant family fun are the keys to global appeal. The Disruption of Streaming Productions
As the industry continues to evolve, the line between "tech company" and "movie studio" will continue to blur. However, the core mission remains the same: to capture lightning in a bottle and share it with the world.
On the opposite end of the scale from Disney is A24. This "indie" darling has become a brand in its own right, known for producing avant-garde, artist-driven films like Everything Everywhere All At Once and Hereditary . They represent the "prestige" side of popular entertainment, proving that niche, high-concept stories can achieve massive commercial success. Animation: A League of Its Own
The landscape of entertainment studios shifted dramatically with the rise of Silicon Valley’s influence. Production is no longer confined to the traditional "Big Five" studios in Los Angeles.
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.
