Round Diamond Carat Size Chart (MM to CT)

Opulent Diam

Find the approximate carat weight of a round diamond from its diameter in millimetres.

Round diamond MM size to carat weight
MM Size Size Preview Carat
0.08 0.002
1.00 0.01
1.12 0.01
1.15 0.01
1.25 0.01
1.30 0.01
1.50 0.02
1.75 0.02
1.80 0.03
2.00 0.03
2.25 0.05
2.50 0.06
2.75 0.08
3.00 0.11
3.25 0.14
3.50 0.17
3.75 0.21
4.00 0.25
4.25 0.28
4.50 0.36
4.75 0.42
5.00 0.49
5.25 0.56
5.50 0.66
5.75 0.76
6.00 0.84
6.25 0.93
6.50 1.03
6.75 1.24
7.00 1.28
7.25 1.49
7.50 1.67
7.75 1.75
8.00 2.04
8.25 2.11
8.50 2.43
8.75 2.55
9.00 2.75
9.25 3.05
9.50 3.35
9.75 3.61
10.00 3.87
10.25 4.16
10.50 4.41
10.75 4.57
11.00 4.91
11.25 5.49
11.50 5.85
12.00 6.84
12.25 7.26
12.50 7.36
12.75 7.52
13.00 8.51
13.50 9.53
14.00 10.19
15.00 12.89
16.00 16.06

Please note: carat weights are approximate and may vary with cut, depth and proportions. The size preview circles are drawn proportionally to the MM size for comparison only.