Millimeters to Carat Conversion Chart

Round Diamond

Do you want to know the millimeter or carat size of a gemstone such as a diamond or sapphire? The Millimeters to Carat Conversion Chart below converts a gemstones from millimeters (mm) to carat weight size.  

 

 Millimeter Size (mm) Carat Weight Size
1mm .005 carat
1.25
.009 carat
1.5
.015 carat
2mm .03 carat
2.5mm
.06 carat
3mm
.10 carat
3.5mm
.16 carat
4mm .25 carat
4.5mm
.33 carat
5mm
.50 carat
5.5mm .65 carat
6mm
.75 carat
6.5mm
1.0 carat
7
1.25 carat
8
2.0 carat
9
2.75 carat
10
3.5 carat
11
4.6 carat
12
6.0 carat
13 7.75 carat
14 9.65 carat
15 12.89 carat