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.
Use our free online tool. No download needed.
Step 1: Calibrate Your Screen
Place a standard credit card on your screen for pixel density calibration.
Place your ring on the screen and drag the handles to match its inner edge.
Your Ring Size
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US Size
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UK Size
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EU Size
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Japan Size
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Diameter (mm)
Tip: Calibrate your screen with a credit card first for maximum accuracy. Want size history, family profiles, and advanced features? Download the app.
A standard credit card is 85.6mm wide. Drag the handles to match your card's width exactly.
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
The system current is below the minimum threshold required for measurement ( at CT secondary).
Increase the response time parameter. Reconfigure step sizes or use a fine-tuning trimming capacitor step. 6. Document Appendix: Locating the Full PDF Manual
Lower the target cos φ or remove permanent fixed capacitors.
By properly utilizing the intelligent algorithms and comprehensive monitoring features of the Epcos BR5016, industrial facilities can significantly lower their carbon footprint, eliminate utility reactive power penalties, and prolong the physical life of their electrical distribution infrastructure. --- Epcos Power Factor Controller Br 5016 Manual Pdf
To ensure a long service life for your Epcos controller and the power factor system:
Tighten all screw terminal blocks. Loose connections cause thermal damage to the controller terminals and contactors. Downloading the Official PDF
High harmonic distortion caused by non-linear loads (VFDs, rectifiers) in the facility. The system current is below the minimum threshold
Refer to the terminal diagram printed on the rear casing of your specific unit. Standard wiring follows these critical rules:
Because TDK no longer actively hosts documentation for this legacy model, finding the official PDF requires targeted search strategies:
Never open-circuit a Current Transformer while the primary circuit is energized. High, life-threatening voltages can develop across the open secondary terminals. Always short-circuit the CT terminals before disconnecting the current inputs from the controller. 3. Programming and Configuration To ensure a long service life for your
The Epcos BR5016 (often branded under TDK Electronics) is a high-end, microprocessor-based automatic power factor controller designed for three-phase power systems. It monitors the reactive power of the network and commands the switching of capacitor steps to maintain a target power factor (cos Key Specifications and Hardware Layout
Enter the primary current value of your CT (e.g., if using a 1000/5A CT, set the primary value to 1000 ). Step 3: Defining Target Power Factor (
The BR5016 functions as a basic power quality analyzer. It measures and displays: Active, reactive, and apparent power Line current and line voltage
Detailed summaries and brochures are also hosted by distributors like Akanksha Power And Infrastructure Ltd and IndiaMART . Safety Note
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.
