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Ring Sizer – Size Measure app icon

Measure and compare ring sizes on your iPhone

Ring Sizer is a ring size finder, ring size chart, and ring size converter that makes ring measurement simple. Use it for engagement rings, wedding bands, gifts, and resizing.

FreeiPhoneOfficial App Store listing
Download on the App Store
Ring Sizer – Size Measure app iPhone app screen for measure and compare ring sizes Ring Sizer – Size Measure app main tools and options on iPhone Ring Sizer – Size Measure app workflow and result preview Ring Sizer – Size Measure app settings and feature screen Ring Sizer – Size Measure app saved results and sharing options

Why people use Ring Sizer

Highlights taken from the app's current App Store listing.

On screen ring sizer with fine size steps.

On screen ring sizer with fine size steps.

Finger sizer with a simple slider and visual guide.

Finger sizer with a simple slider and visual guide.

Ring size converter and ring size

Ring size converter and ring size chart in one place.

International sizes for US and Canada

International sizes for US and Canada, UK and Australia, EU and ISO, Japan and China.

Diameter and circumference in millimeters

Diameter and circumference in millimeters for each size.

Save and organize sizes with hand and finger labels.

Save and organize sizes with hand and finger labels.

How it works

A simple starting workflow for measure and compare ring sizes.

  1. Enter the values

    Add a ring or finger measurement.

  2. Compare the result

    Adjust the inputs to understand how different assumptions change the answer.

  3. Use the estimate

    Save or share the result, and verify important decisions with an appropriate expert or source.

Frequently asked questions

Quick answers — each one links to a full guide when there's more to know.

What does Ring Sizer do?
Ring Sizer is a ring size finder, ring size chart, and ring size converter that makes ring measurement simple. Use it for engagement rings, wedding bands, gifts, and resizing.
Is Ring Sizer free?
The current App Store listing shows Free. Check the listing before downloading for current in-app purchases, subscriptions, or premium options.
Which iPhone version does Ring Sizer support?
The app is available through Apple's App Store. The current listing requires iOS 15.1 or later. Compatibility can change with later releases, so confirm it on the current listing.
How does Ring Sizer handle privacy?
Review the App Privacy section on the official App Store listing for the developer's current data-handling disclosures before installing.
When was Ring Sizer last updated?
The catalog snapshot shows version 1.0, updated January 12, 2026. Open the App Store listing for the newest release notes.

Try Ring Sizer on iPhone

Open the official App Store listing for the latest features, compatibility, pricing, and privacy details.

Download on the App Store