Ring size - Easy Finger Size
Easily check your ring size by placing it on your smartphone screen.
Preview
About
An intuitive application designed to help you easily determine your ring size. Simply place a ring you already own directly onto your smartphone screen, adjust the displayed circle to match the inner diameter of your ring, and the app instantly displays your correct ring size at the top of the screen. Perfect for online shopping or surprise gifts.
Features
Screen Calibration
Adaptive circle matching the physical reality of the rings.
Multiple Standards
Instantly see equivalents in various regional sizing systems.
Easy to Use
No physical tools needed, just your phone and a ring.
Information
Frequently Asked Questions
The app uses your smartphone's exact screen dimensions — which are precisely known from the manufacturer — to display a perfectly scaled measurement circle. Place an existing ring flat on the screen, resize the circle until it matches the ring's inner edge, and your size is instantly shown in EU, US, UK, and JP formats simultaneously.
Yes. Unlike many ring sizer apps that require you to align a credit card, Ring size - Easy Finger Size uses your device's exact physical screen dimensions from its manufacturer specifications. Every measurement is accurate from the very first launch — no credit card, no guesswork, no setup.
The app simultaneously displays your ring size in all major international standards: EU / ISO (inner diameter in mm), US (numerical scale 1–13), UK (alphabetical A–Z scale), and JP (Japanese JIS numerical scale). Use whichever standard your jeweler or online store requires.
Ring size - Easy Finger Size is completely free to download and use with no in-app purchases, subscriptions, or ads during the measurement process. You get the full feature set immediately after downloading from Google Play.
The app is primarily designed to measure the inner diameter of a ring you already own — the most accurate method. To measure a bare finger, wrap a thin strip of paper around the knuckle, mark where it overlaps, measure that length, and compare it against the app's circle. This alternative method works well as a close approximation.
The app is available on Google Play for Android and supports a wide range of smartphones. Because it uses each device's known screen specifications rather than a manual calibration step, it works reliably across different manufacturers and screen sizes without any additional configuration.
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Easily check your ring size by placing it on your smartphone screen.
User Reviews
Best ring sizer I've ever tried
I was skeptical at first, but this app is incredibly accurate. I ordered a ring online using the size it gave me and it fit perfectly on the first try. No calibration needed — just place the ring and go!
Ordered the perfect size on the first try
Used this to secretly measure my girlfriend's ring size before proposing. The app was dead simple and the ring fitted perfectly. It genuinely saved the surprise — couldn't recommend it more.
So easy and surprisingly accurate
I've tried printable charts before and they never worked well. This app took 30 seconds and the measurement was spot on. The dark mode interface makes it really easy to see the ring clearly on screen.
Saved my proposal!
I needed to find my partner's ring size without giving away the surprise. I borrowed a ring from her jewelry box, used this app in under a minute, and the engagement ring fitted flawlessly. This app is a lifesaver.
No calibration — that's the key differentiator
Every other app I tried required aligning a credit card for calibration, which introduces errors. This one just works instantly. Showing EU, US, UK, and JP sizes simultaneously is perfect for international shopping.
Better than going to a jeweler
Honestly better than my experience at most jewelry counters. Clean interface, zero ads during measurement (a huge plus), and the result matched my in-store sizing exactly. Will use this every time I need to buy a ring online.
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Free download · Available on Android · Works offline