Below is Vandan’s Diamond MM to Carat Chart showing you the carat size in relation to each millimeter size.

MM Size Carat Weight
(Round Diamond Millimeter Size) (Round Diamond Carat Weights)
0.7 mm 0.002 carats
0.8 mm 0.002 carats
0.9 mm 0.0042 carats
1 mm 0.005 carats
1.1 mm 0.0068 carats
1.2 mm 0.0085 carats
1.25 mm 0.0095 carats
1.3 mm 0.01 carats
1.4 mm 0.0125 carats
1.5 mm 0.015 carats
1.6 mm 0.0175 carats
1.7 mm 0.0185 carats
1.8 mm 0.025 carats
MM Size Carat Weight
(Round Diamond Millimeter Size) (Round Diamond Carat Weights)
1.9 mm 0.0275 carats
2 mm 0.03 carats
2.1 mm 0.035 carats
2.2 mm 0.04 carats
2.3 mm 0.045 carats
2.4 mm 0.055 carats
2.5 mm 0.06 carats
2.6 mm 0.065 carats
2.7 mm 0.075 carats
2.8 mm 0.085 carats
2.9 mm 0.093 carats
3 mm 0.1 carats
MM Size Carat Weight
(Round Diamond Millimeter Size) (Round Diamond Carat Weights)
3.1 mm 0.11 carats
3.2 mm 0.13 carats
3.3 mm 0.145 carats
3.4 mm 0.155 carats
3.5 mm 0.17 carats
3.6 mm 0.19 carats
3.7 mm 0.205 carats
3.8 mm 0.22 carats
3.9 mm 0.235 carats
4 mm 0.25 carats
4.1 mm 0.26 carats
4.2 mm 0.28 carats
4.3 mm 0.30 carats
MM Size Carat Weight
(Round Diamond Millimeter Size) (Round Diamond Carat Weights)
4.4 mm 0.33 carats
4.5 mm 0.36 carats
4.6 mm 0.40 carats
4.7 mm 0.43 carats
4.8 mm 0.45 carats
4.9 mm 0.48 carats
5 mm 0.5 carats
5.1 mm 0.53 carats
5.2 mm 0.56 carats
5.3 mm 0.58 carats
5.4 mm 0.625 carats
5.5 mm 0.66 carats