Free Ring Sizer App — Measure Your Ring Size on iPhone
Looking for a free ring sizer app that actually works? Ring Sizer is the #1 free ring sizing app for iPhone, trusted by thousands to measure ring sizes accurately in seconds. No tools, no measurements, no cost. Just your iPhone and a ring.
Whether you're shopping for an engagement ring, resizing jewelry, or finding the perfect fit, our free ring sizer app eliminates guesswork. Download it today and get your exact ring size in US, UK, EU, Japan, India, and Australian standards—all completely free.
Why Ring Sizer Is the Best Free Ring Sizing App
Accurate On-Screen Measurement
Measure your ring directly on your iPhone screen with precision calibration. Get your exact size in seconds.
All International Standards
Supports US, UK, EU, Japan, India, Australia, and more. Convert between any sizing standard instantly.
Family Profiles
Save ring sizes for yourself, your partner, family, and friends. Never forget a size again.
Works Offline & Privately
Use the app anywhere, anytime. No internet needed, no data collection, complete privacy.
Beautiful Intuitive Design
Simple, clean interface that anyone can use. No confusing menus or complicated steps.
Instant Results
Get your ring size in under 30 seconds. No waiting, no forms, no complicated calibration.
How to Use the Free Ring Sizer App
- Download Ring Sizer from the App Store. It's completely free with no subscriptions or in-app purchases required for basic ring sizing.
- Open the app and place your ring on your iPhone screen. Follow the simple on-screen instructions to position your ring properly for measurement.
- Get your ring size instantly in multiple standards. The app shows your size in US, UK, EU, Japan, India, Australia, and more.
What Makes It Different from Other Ring Sizer Apps
Not all free ring sizer apps are created equal. Here's why Ring Sizer stands out:
- No ads cluttering the measurement screen — Focus on your measurement without distractions
- No login required — Start measuring immediately without creating an account
- No subscription needed — All core features are free, forever
- Accurate calibration system — Simple one-time calibration gives you precise results every time
- Supports 6+ international size standards — Not just US sizes, but UK, EU, Japan, India, Australia, and more
- Family-friendly — Save sizes for multiple people in one app
Ring Size Chart — Quick Reference
| Diameter (mm) | US Size | UK Size | EU Size |
|---|---|---|---|
| 17.4 | 5 | J½ | 50 |
| 17.8 | 6 | L | 52 |
| 18.2 | 7 | N | 54 |
| 18.5 | 8 | P | 57 |
| 18.9 | 9 | R | 59 |
| 19.3 | 10 | T | 62 |
Frequently Asked Questions
Is the Ring Sizer app really free?
Yes, Ring Sizer is completely free to download and use. All core measurement features are available at no cost, with no in-app purchases required for everyday ring sizing. We believe everyone should have access to accurate ring sizing without paying.
Does it work without internet?
Yes, the Ring Sizer app is fully offline. You can measure ring sizes without any internet connection, making it perfect for use anywhere, anytime. Your data stays on your device.
What iPhone models are supported?
Ring Sizer works on all iPhones with iOS 16 or later. This includes iPhone 8, iPhone X, iPhone 11, 12, 13, 14, 15, and the latest models. Check the App Store to confirm compatibility with your device.
How accurate is the free ring sizer app?
The Ring Sizer app provides very accurate measurements with proper calibration. Simply follow the on-screen calibration process at the start (using a known reference), and you'll get precise ring sizes consistent with professional jeweler measurements.
Can I measure someone else's ring size?
Yes, absolutely. Just borrow their ring and follow the same measurement process. You can save multiple profiles in the app for family members, friends, and partners, so you always have their sizes handy.