Ring Sizer – Size Your Finger

Find your ring size right on your iPhone. Measure an existing ring on screen or measure your finger without a ring, then get your diameter, circumference, and ring size in US, UK, EU, and JP sizing systems.

No printing, paper size charts, account, or extra tools required. Whether you're buying a ring, choosing a gift, or helping a customer find the right size, you can get the measurements you need in seconds.

IDEAL FOR

• Finding your ring size before buying jewelry online
• Measuring an existing ring that already fits
• Measuring your finger when you don't have a ring
• Choosing a ring size for a gift, engagement, or wedding
• Helping customers compare ring sizes across different sizing systems

KEY FEATURES

◆ MEASURE AN EXISTING RING
Place a ring on your iPhone screen and adjust the on-screen guide to match its inner edge. Get its diameter, circumference, and corresponding ring size.

◆ NO RING? MEASURE YOUR FINGER
Don't have a ring to measure? Use the finger measurement flow to find your size without an existing ring or a printed size chart.

◆ US, UK, EU & JP RING SIZES
See your result in US, UK, EU, and JP sizing systems, making it easier to shop from jewelers and stores that use different size standards.

◆ DIAMETER & CIRCUMFERENCE
Get more than a ring size. View the measured diameter and circumference to help compare sizes and check jewelry measurements.

◆ NO PRINTING OR EXTRA TOOLS
Measure with your iPhone without printing a ring sizer or using a ruler, measuring tape, or other equipment.

◆ QUICK & SIMPLE
Open the app, choose how you want to measure, and get your result in seconds. No account or lengthy setup required.

FREQUENTLY ASKED QUESTIONS

How can I find my ring size with my iPhone?
You can measure an existing ring directly on your iPhone screen or use the finger measurement flow if you don't have a ring.

Can I measure a ring I already own?
Yes. Place a ring that fits you on the screen and adjust the guide to its inner edge to determine its measurements and size.

How can I find my ring size without a ring?
Use the finger measurement flow. It lets you estimate your ring size without an existing ring or a printed ring sizer.

Which ring size systems are supported?
The app shows ring sizes in US, UK, EU, and JP systems, along with diameter and circumference.

Can I use it when buying a ring as a gift?
Yes. If you hav