Diamond Size to Carat Conversion Chart

Use this chart to convert the size of your diamond in millimeters (mm) to carats (ct).

Size (mm)	Size (ct.)
1.30 - 1.35 mm	0.010
1.35 - 1.40 mm	0.011
1.40 - 1.45 mm	0.012
1.45 - 1.50 mm	0.014
1.55 - 1.60 mm	0.016
1.60 - 1.70 mm	0.018
1.70 - 1.80 mm	0.021
1.80 - 1.90 mm	0.025
1.90 - 2.00 mm	0.029
2.00 - 2.10 mm	0.035
2.10 - 2.20 mm	0.039
2.20 - 2.30 mm	0.044
2.30 - 2.40 mm	0.052
2.40 - 2.50 mm	0.058
2.50 - 2.60 mm	0.069
2.60 - 2.70 mm	0.074
2.70 - 2.80 mm	0.078
2.80 - 2.90 mm	0.086
2.90 - 3.00 mm	0.095
3.00 - 3.10 mm	0.108
3.10 - 3.20 mm	0.116
3.20 - 3.30 mm	0.130
3.30 - 3.40 mm	0.145
3.40 - 3.50 mm	0.155
3.50 - 3.60 mm	0.165
3.60 - 3.70 mm	0.190
3.70 - 3.80 mm	0.200
3.80 - 3.90 mm	0.215
3.90 - 4.00 mm	0.235
4.00 - 4.10 mm	0.255
4.10 - 4.20 mm	0.265
4.20 - 4.30 mm	0.275
4.30 - 4.40 mm	0.285