MM To Carat Conversion Calculator


In the world of gemstones, accurate measurement conversions are essential for jewelers and gemologists. One crucial conversion is from millimeters (mm) to carats, as it helps determine a gemstone’s weight. To simplify this process, we introduce the MM to Carat Conversion Calculator.

How to Use

  1. Enter the measurement in millimeters (mm) of the gemstone.
  2. Click the “Calculate” button to get the equivalent weight in carats.


The formula for converting millimeters (mm) to carats is straightforward:

Example Solve

Suppose we have a gemstone with dimensions:

  • Length: 7 mm
  • Width: 5 mm
  • Height: 3 mm

Using the formula:


Q: Why is the constant 1650 used in the formula?
A: The constant 1650 is the average density of gemstones, ensuring a standardized conversion across various types.

Q: Can this calculator be used for irregularly shaped gemstones?
A: No, this calculator assumes the gemstone has a regular shape for accurate results.

Q: What if I input measurements in inches instead of millimeters?
A: For accurate results, ensure all measurements are in millimeters.


The MM to Carat Conversion Calculator offers a convenient tool for jewelers and gemologists to swiftly determine gemstone weights. By inputting millimeter measurements, users can obtain carat equivalents, aiding in precise gemstone assessments and transactions.

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