# RingSizer – Ring Size Tool — Measure & Convert Ring Sizes

> Measure & Convert Ring Sizes (iPhone/iPad app by ReflectBuddy.)

- Source: https://appshunter.io/ios/app/ringsizer-ring-size-tool/id6798043494 (this page in markdown: same URL + `.md`)
- Developer: [ReflectBuddy](https://appshunter.io/developer/1782977954)
- Category: Utilities, Shopping
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: American English
- Released: 2026-09-14
- Data updated: 2026-09-17
- User reviews in markdown: https://appshunter.io/ios/app/ringsizer-ring-size-tool/id6798043494/reviews.md

## What is RingSizer?

RingSizer turns your iPhone into a precision jeweler's tool — no ring sizer, no guesswork, no trip to the store.

MEASURE YOUR RING
Already have a ring that fits? Place it flat on your screen and align it with the on-screen guide. RingSizer uses your device's exact screen dimensions — with optional bank-card calibration for extra precision — to calculate your true size.

MEASURE YOUR FINGER
No ring on hand? Use the two-step Ellipse Method. Fingers aren't perfectly round, so RingSizer measures both width and thickness for a scientifically accurate fit, based on the same math jewelers use.

CONVERT BETWEEN SYSTEMS
Instantly convert between EU, US, UK, Japanese, Australian and Swiss/German ring sizes — or look up any size by diameter and circumference.

LIFE-SIZE RULER
A true-to-scale on-screen ruler for measuring anything small, in mm, cm or inches.

FEATURES
• High-accuracy ellipse-based finger measurement
• Bank-card screen calibration for pixel-perfect results
• Worldwide size conversion (EU, US, UK, JP, AU, CH/DE)
• Save and organize your measurement history
• Evening measurement reminder — fingers swell throughout the day, so a second reading helps you land on your truest size
• Private by design — your measurements never leave your device

RingSizer Premium unlocks unlimited history, expert fitting advice, and full worldwide size conversion — with a one-time purchase, no subscription.

Whether you're buying a ring as a surprise, replacing a lost one, or shopping online, RingSizer gives you a confident, accurate answer in seconds.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| RingSizer Premium (Lifetime) | $5.99 | one-time |



## Version history (last 1 release)

### 1.0 — 2026-09-14

No release notes.

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## More apps by ReflectBuddy

- [Hand Mirror: HD, Light & Zoom](https://appshunter.io/ios/app/hand-mirror-hd-light-and-zoom/id6738931920)

All apps by ReflectBuddy: https://appshunter.io/developer/1782977954

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-17.*