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Diamond Weight Calculator

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Estimates the carat weight of a diamond based on its shape and measurements.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Diamond Shape, Length (mm), Width (mm), and Depth (mm) in the units shown.

Step 2

Read Estimated Volume (mm³) and Estimated Weight (carats) in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

Example calculations

See the inputs and their calculated results.

Round Diamond Example

Diamond Shape: Round; Length (mm): 6.5 mm; Width (mm): 6.5 mm; Depth (mm): 4 mm

Estimated Volume (mm³): 169 mm³; Estimated Weight (carats): 25.37537538 carats

Princess Diamond Example

Diamond Shape: Princess; Length (mm): 6 mm; Width (mm): 6 mm; Depth (mm): 4 mm

Estimated Volume (mm³): 144 mm³; Estimated Weight (carats): 16.55172414 carats

Oval Diamond Example

Diamond Shape: Oval; Length (mm): 7 mm; Width (mm): 5 mm; Depth (mm): 3 mm

Estimated Volume (mm³): 105 mm³; Estimated Weight (carats): 13.7254902 carats

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