Know Your Ring Size.
Measure at home in seconds and convert to every size system. No ruler, no jeweler.
Download
Rating
4.9
Features
Everything you need to nail the size
Built to give you a measurement you can actually trust, then read it back in whatever system the jeweler uses.
- size systems
- 12 size systems
- ways to measure
- 3 ways to measure
- sizes charted
- 21 sizes charted
- offline
- 100% offline
- sign-up
- 0 sign-up
- App Store
- 4.9★ App Store
Three ways to measure
One that fits every situation.
Ring on screenMost accurate96%
Finger on screen82%
String or paper74%
Zero setup
Calibrated to your device
iPhone 16 Pro
460 ppi · auto-detected
From one measurement
Your size in every system
⌀ 17.5 mm55.0 mm
United States7
UK / AustraliaN½
Europe · ISO55
Japan · China15
Convert without measuringOpen the converter
Find your size anywhere
US 7⌘K
UK / AustraliaN½
Europe55
Japan15
Fits the band
Adjusts for band width
ThinMediumExtra-wide
Private Offline No account
"Sized my partner's ring without them ever knowing. The proposal went perfectly."
James R., engaged this spring
Three methods: place an existing ring on the screen, put your finger directly on the screen, or use a string or paper strip. Pick whichever you have on hand.