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
7mm
1.25 carat
8mm
2.0 carat
9mm
2.75 carat
10mm
3.5 carat
11mm
4.6 carat
12mm
6.0 carat
13mm 7.75 carat
14mm 9.65 carat
15mm 12.89 carat