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.
Next, the importance of these boot program discs. They must be crucial for programming or reprogramming ECUs, especially in scenarios like remapping, repairing, or replacing the ECU. Dealers might use them during service or to update vehicle software. Mechanics or tuners might require them for custom tuning, but only dealers have the original discs and authorization from Toyota.
Potential uses: diagnostics, ECU replacement, performance tuning. But again, only dealers have the proper tools and authorization. Aftermarket solutions might require these programs, but they're not easily accessible. toyota nddnw58 nddnw57 boot program disc
A: No—they are exclusive to authorized Toyota dealerships and cannot be legally sourced elsewhere. Next, the importance of these boot program discs
I should structure the write-up with an introduction, explanations of what the discs are, their role in the vehicle, use cases, security considerations, and common issues. Also, maybe some FAQs at the end. Mechanics or tuners might require them for custom
First, I should clarify what boot programs are. In the context of cars, boot programs are essential for initializing the ECU (Electronic Control Unit) when the vehicle is started. They handle the startup process, diagnostics, and initializing other systems. But I'm not exactly sure what the difference between NDDNW58 and NDDNW57 is. Maybe they are different versions or models?
Security aspects come into play here. Toyota likely uses encryption or proprietary protocols to prevent unauthorized use. Unauthorized duplication or tampering could void warranties or cause issues with emissions compliance. I should mention the legal and ethical considerations here.
I need to be careful not to suggest any illegal activities, like using non-authorized discs, so I should emphasize the importance of following manufacturer guidelines and using official sources. Highlighting the risks of using unapproved discs could be important.
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
Next, the importance of these boot program discs. They must be crucial for programming or reprogramming ECUs, especially in scenarios like remapping, repairing, or replacing the ECU. Dealers might use them during service or to update vehicle software. Mechanics or tuners might require them for custom tuning, but only dealers have the original discs and authorization from Toyota.
Potential uses: diagnostics, ECU replacement, performance tuning. But again, only dealers have the proper tools and authorization. Aftermarket solutions might require these programs, but they're not easily accessible.
A: No—they are exclusive to authorized Toyota dealerships and cannot be legally sourced elsewhere.
I should structure the write-up with an introduction, explanations of what the discs are, their role in the vehicle, use cases, security considerations, and common issues. Also, maybe some FAQs at the end.
First, I should clarify what boot programs are. In the context of cars, boot programs are essential for initializing the ECU (Electronic Control Unit) when the vehicle is started. They handle the startup process, diagnostics, and initializing other systems. But I'm not exactly sure what the difference between NDDNW58 and NDDNW57 is. Maybe they are different versions or models?
Security aspects come into play here. Toyota likely uses encryption or proprietary protocols to prevent unauthorized use. Unauthorized duplication or tampering could void warranties or cause issues with emissions compliance. I should mention the legal and ethical considerations here.
I need to be careful not to suggest any illegal activities, like using non-authorized discs, so I should emphasize the importance of following manufacturer guidelines and using official sources. Highlighting the risks of using unapproved discs could be important.
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.
