SScale to Grams

Measure Ring Size from Photo

Find the perfect ring size without a ring sizer

Buying a ring as a surprise? Or need to know your own size? Place an existing ring on a flat surface, photograph it next to a coin for reference, and get the inner diameter to determine ring size.

Photo a ring next to a coin for sizing

Drag & drop an image, or click to browse

How It Works

1

Photograph the Object

Take a clear photo of the item you want to measure from a good angle.

2

AI Measures Dimensions

Advanced AI analyzes the image and calculates length, width, and height.

3

View Measurements

Get precise dimensions in centimeters or inches displayed instantly.

Find Your Ring Size from Home

Shopping for a ring online or planning a surprise proposal? Our AI measures the inner diameter of a ring from a photo, helping you determine the correct ring size. Place an existing ring that fits well on a flat surface next to a coin, photograph it, and get the diameter measurement you need.

Ring Size Conversion Made Easy

Ring sizes vary between countries and measurement systems. A diameter of 17.3 millimeters corresponds to a US size 7, while 18.2 millimeters is a US size 8. Once you have the diameter from our tool, you can easily convert it to US, UK, European, or Asian ring sizes using standard conversion charts.

The Coin Reference Trick for Accurate Measurements

The key to accurate ring sizing from a photo is including a reference object with known dimensions. A US quarter is 24.26 millimeters in diameter, a Euro coin is 23.25 millimeters, and a UK pound coin is 23.43 millimeters. Place one of these next to your ring for the most precise diameter measurement.

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Measure Ring Size from Photo FAQ