Carat Weight Calculator

Select the shape of your diamond below:

The shape of my diamond is


This will be the same number for the widest point for round diamonds.

Diamond graphic indicating the measurements

Your Diamond Carat Weight is


Download our Diamond Size Chart for free. Print the chart to see what carat weight your diamond is.

Carat Weight and Diamond Cost

The carat weight of your stone will have a direct impact its worth. The bigger the stone the more it is worth.

Of course there are many other factors that impact the value of a diamond, including color grade, clarity, cut etc. However carat weight is a great place to start.

If you are looking to buy diamonds or sell diamonds, understanding carat weight is a key first step.


How to Use our Online Carat Weight Calculator

To calculate the carat weight of your diamond:

  1. Measure length, width and height of the stone
  2. Enter these in mm in the carat weight calculator
  3. Get your results
  4. Any questions about getting a price quote for your diamond? Contact our team of GIA trained gemologist Monday-Friday and we will be happy to help.

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