Diamond Weight Calculator
Use our free diamond weight calculator to determine the approximate weight of your diamond based on its dimensions.
The diamond weight calculator is fairly simple to use. All you need to do is:
- Select the shape of the diamond from the drop-down
- Enter the diamond dimensions (the diameter or length, width, and depth) in mm.
- You can also select the girdle thickness from the drop-down list and enter the weight correction factor, if needed
Finally, in the last step, click on the "Calculate" button to determine an estimated carat weight of your diamond.
Depth Percentage:
Length to Width Ratio:
Diamond weight estimation formulae
The Diamond Carat Weight Calculator uses the following weight estimation formulae:
- Round Brilliant: Approximate Estimated Carat Weight = Diameter ^{ 2 } × Depth × 0.0061 × GTF
- Oval: Approximate Estimated Carat Weight = Length × Width × Depth × 0.0062 × GTF × WCF
- Princess Cut: Approximate Estimated Carat Weight = Length × Width × Depth × 0.0083 × GTF × WCF
- Asscher Cut: Approximate Estimated Carat Weight = Length × Width × Depth × 0.0080 × GTF × WCF
- Cushion Cut: Approximate Estimated Carat Weight = Length × Width × Depth × 0.00815 × GTF × WCF
- Heart: Approximate Estimated Carat Weight = Length × Width × Depth × 0.0059 × GTF × WCF
- Baguette: Approximate Estimated Carat Weight = Length × Width × Depth × 0.00915 × GTF × WCF
- Trillion Cut: Approximate Estimated Carat Weight = Length × Width × Depth × 0.0057 × GTF × WCF
- Emerald Cut: Approximate Estimated Carat Weight = Length × Width × Depth × Adjustment Factor × GTF × WCF
- Length to Width Ratio = 1.00 : 1.00, Adjustment Factor = 0.0080
- Length to Width Ratio = 1.50 : 1.00, Adjustment Factor = 0.0092
- Length to Width Ratio = 2.00 : 1.00, Adjustment Factor = 0.0100
- Length to Width Ratio = 2.50 : 1.00, Adjustment Factor = 0.0106
- Radiant Cut: Approximate Estimated Carat Weight = Length × Width × Depth × Adjustment Factor × GTF × WCF
- Length to Width Ratio = 1.00 : 1.00, Adjustment Factor = 0.0081
- Length to Width Ratio = 1.50 : 1.00, Adjustment Factor = 0.0084
- Marquise Cut: Approximate Estimated Carat Weight = Length × Width × Depth × Adjustment Factor × GTF × WCF
- Length to Width Ratio = 1.50 : 1.00, Adjustment Factor = 0.00565
- Length to Width Ratio = 2.00 : 1.00, Adjustment Factor = 0.00580
- Length to Width Ratio = 2.50 : 1.00, Adjustment Factor = 0.00585
- Length to Width Ratio = 3.00 : 1.00 , Adjustment Factor = 0.00595
- Pear: Approximate Estimated Carat Weight = Length × Width × Depth × Adjustment Factor × GTF × WCF
- Length to Width Ratio = 1.25 : 1.00, Adjustment Factor = 0.00615
- Length to Width Ratio = 1.50 : 1.00, Adjustment Factor = 0.00600
- Length to Width Ratio = 1.66 : 1.00, Adjustment Factor = 0.00590
- Length to Width Ratio = 2.00 : 1.00, Adjustment Factor = 0.00575
Where, GTF = Girdle Thickness Factor, WCF = Weight Correction Factor.