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. ubg95githubio upd
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. It was a typical Monday morning for John,
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. As they collaborated, John realized that the mysterious
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.
It was a typical Monday morning for John, a software engineer at a popular tech firm. As he sipped his coffee and booted up his computer, he noticed an unusual email in his inbox. The subject line read: "ubg95githubio upd".
As they collaborated, John realized that the mysterious email had turned into a valuable connection. He learned about a new tool that could benefit his work and had the chance to meet a like-minded developer.
At first, John was skeptical. He didn't recognize the sender, and the subject line seemed like a jumbled mess of characters. But as he opened the email, he found a curious message:
As John explored the project, he realized that it was still in its early stages. However, the code was well-organized, and the documentation was clear. He saw an opportunity to contribute to the project and provide feedback to the creator.
"Hey there! I've been working on a new project, and I think you might find it interesting. I've created a GitHub page (ubg95githubio) and made some updates. Take a look and let me know what you think!"
How was that? Did I help you with a story?
Even the most cryptic messages can lead to exciting opportunities. Be open to exploring new ideas, and don't be afraid to reach out to others. You never know what helpful connections you might make!
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
It was a typical Monday morning for John, a software engineer at a popular tech firm. As he sipped his coffee and booted up his computer, he noticed an unusual email in his inbox. The subject line read: "ubg95githubio upd".
As they collaborated, John realized that the mysterious email had turned into a valuable connection. He learned about a new tool that could benefit his work and had the chance to meet a like-minded developer.
At first, John was skeptical. He didn't recognize the sender, and the subject line seemed like a jumbled mess of characters. But as he opened the email, he found a curious message:
As John explored the project, he realized that it was still in its early stages. However, the code was well-organized, and the documentation was clear. He saw an opportunity to contribute to the project and provide feedback to the creator.
"Hey there! I've been working on a new project, and I think you might find it interesting. I've created a GitHub page (ubg95githubio) and made some updates. Take a look and let me know what you think!"
How was that? Did I help you with a story?
Even the most cryptic messages can lead to exciting opportunities. Be open to exploring new ideas, and don't be afraid to reach out to others. You never know what helpful connections you might make!
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.
