Ring and finger measurement
Start from diameter or circumference, then compare the real measurement behind each ring size.
LoopSize - Ring Sizer Chart
Measure, convert, save, and share ring sizes with precise diameter and circumference tools, international standards, iCloud sync, history, and branded PDF export.
Platform iPhone
Version 1.2.0
Standards BR, US, UK, EU/ISO, JP, CN, IN
Dimensions Diameter + circumference
Pro iCloud + branded PDF
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Start from a simple workflow to find your perfect ring size. -
Convert instantly between BR, US, UK, EU/ISO, JP, CN, and IN standards. -
Check diameter and circumference with high precision. -
Share a clear PDF and personalize it with your brand. -
Save measurements, preferences, and ring sizes with iCloud sync.
Key features
International conversion
Convert instantly between BR, US, UK, EU/ISO, JP, CN, and IN standards when shopping online, traveling, or helping a customer.
Precise dimensions
Keep diameter and circumference visible so ring decisions are based on exact measurements, not only a chart.
PDF sharing
Share a clear measurement PDF with a jeweler, customer, partner, family member, or your future self.
Branded PDF export
Pro users can personalize exported PDFs with their brand for a more professional customer handoff.
iCloud sync and history
Pro users can sync measurements and preferences with iCloud, then revisit saved history for repeat customers, future purchases, or adjustments.
Best for
Buying online or choosing a gift
Check a ring size before purchasing, compare international charts, and save possible measurements with more confidence.
Jewelry consultations
Measure rings or fingers, explain conversions, and send polished PDFs to customers after a sizing conversation.
FAQ
Which ring size standards does LoopSize support?
LoopSize converts instantly between BR, US, UK, EU/ISO, JP, CN, and IN ring size standards.
Can I save my measurements?
Yes. With LoopSize Pro, you can keep a history of measurements, save ring sizes, and sync measurements and preferences with iCloud.
Can I share my ring size?
Yes. LoopSize lets you share your measurements in PDF, and Pro users can personalize the PDF with their brand.
Does LoopSize show ring dimensions?
Yes. You can measure by diameter or circumference, keep both values visible, and compare the equivalent size across supported standards.
What changed in the latest version?
Version 1.2.0 adds branded PDF customization, iCloud sync for measurements and preferences, accessibility improvements, and an enhanced ring and finger size marker.
Does it work offline?
Yes, all calculations are done locally. Sharing features may require an internet connection.
How do I restore my purchases?
If you’ve already purchased LoopSize Pro, you don’t need to pay again when switching to a new iPhone or reinstalling the app. Simply tap the “Restore Purchases” button in the paywall and the app will automatically check, through your Apple ID, all your previous purchases and subscriptions. If there’s an active subscription or lifetime purchase, Pro access will be unlocked instantly — at no extra cost.