Is this mm to Carat Conversion Calculator free to use?

Yes, mm to Carat Conversion Calculator is 100% free to use online with no installation or account required.

How do I use the mm to Carat Conversion Calculator?

Simply enter your values into the required input fields and click calculate to view the results instantly.

Yes, the calculator is fully responsive and compatible with Android, iOS, Windows, macOS, and Linux web browsers.

MM to Carat Conversion Calculator — Free Online Tool

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Estimate gemstone carat weight from millimeter diameter

Instructions: Enter the stone diameter in millimeters (mm) and select the gemstone cut type below.

Gemstone Parameters

Diameter / Size (mm)

Gemstone Cut / Type

⚠️ For jewelry estimation, gemology study, and reference purposes only. Actual weight may vary based on depth and cut proportions.

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