Convert

CARAT TO MM

Carat weight to Millimeter Converter is a professional tool that helps to approximately determine the diamond size on a finger.

See below the equivalent carat to mm size table for Round Brilliant Cut, Cushion Cut, Pear shape, Emerald Cut, Oval Cut, Princess Cut, Hear shape, Marquise cut, Asscher cut and Radiant cut.

Round Brilliant cut
MM Size
Carat Weight
0.8 mm.
0.0025 ct.
1 mm.
0.005 ct.
1.15 mm.
0.0067 ct.
1.12 mm.
0.0075 ct.
1.25 mm.
0.01 ct.
1.3 mm.
0.01 ct.
1.5 mm.
0.015 ct.
1.75 mm.
0.02 ct.
1.8 mm.
0.025 ct.
2 mm.
0.03 ct.
2.25 mm.
0.04 ct.
2.5 mm.
0.06 ct.
2.75 mm.
0.08 ct.
3 mm.
0.11 ct.
3.25 mm.
0.14 ct.
3.5 mm.
0.17 ct.
3.75 mm.
0.21 ct.
4 mm.
0.25 ct.
4.25 mm.
0.28 ct.
4.5 mm.
0.36 ct.
4.75 mm.
0.44 ct.
5.0 mm.
0.50 ct.
5.25 mm.
0.56 ct.
5.5 mm.
0.66 ct.
5.75 mm.
0.75 ct.
6 mm.
0.84 ct.
6.25 mm.
0.93 ct.
6.5 mm.
1.00 ct.
6.8 mm.
1.25 ct.
MM Size
Carat Weight
7 mm.
1.30 ct.
7.3 mm.
1.50 ct.
7.5 mm.
1.67 ct.
7.75 mm.
1.75 ct.
8 mm.
2.00 ct.
8.25 mm.
2.11 ct.
8.5 mm.
2.43 ct.
8.7 mm.
2.50 ct.
9 mm.
2.75 ct.
9.1 mm.
3.00 ct.
9.5 mm.
3.35 ct.
9.75 mm.
3.61 ct.
10 mm.
3.87 ct.
10.25 mm.
4.16 ct.
10.5 mm.
4.41 ct.
10.75 mm.
4.57 ct.
11 mm.
4.91 ct.
11.25 mm.
5.49 ct.
11.5 mm.
5.85 ct.
12 mm.
6.84 ct.
12.25 mm.
7.26 ct.
12.5 mm.
7.36 ct.
12.75 mm.
7.52 ct.
13 mm.
8.51 ct.
13.5 mm.
9.53 ct.
14 mm.
10.49 ct.
15 mm.
12.89 ct.
16 mm.
16.06 ct.
Cushion cut
MM Size
Carat Weight
4.2 mm.
0.40 ct.
4.9 mm.
0.50 ct.
5.25 mm.
0.75 ct.
5.5 mm.
1.00 ct.
6 mm.
1.25 ct.
6.5 mm.
1.50 ct.
7 mm.
2.00 ct.
7.5 mm.
2.50 ct.
MM Size
Carat Weight
8 mm.
3.00 ct.
8.5 mm.
3.50 ct.
9 mm.
4.12 ct.
9.5 mm.
5.09 ct.
10 mm.
5.62 ct.
11 mm.
7.44 ct.
12 mm.
9.52 ct.
13 mm.
12.66 ct.
Pear Shape
MM Size
Carat Weight
3×2 mm.
0.13 ct.
4×2.5 mm.
0.18 ct.
4×3 mm.
0.21 ct.
5×3 mm.
0.25 ct.
5×4 mm.
0.35 ct.
6×4 mm.
0.50 ct.
6.5×4.5 mm.
0.60 ct.
7×5 mm.
0.75 ct.
7.5×5.5 mm.
0.85 ct.
7.7×5.7 mm.
1.00 ct.
8×6 mm.
1.25 ct.
8.5×6.5 mm.
1.50 ct.
10×6 mm.
1.71 ct.
8.7×6.7 mm.
1.80 ct.
9×7 mm.
2.00 ct.
10×8 mm.
2.50 ct.
11×7.50 mm.
2.61 ct.
13×8 mm.
2.98 ct.
11×8 mm.
3.00 ct.
MM Size
Carat Weight
12×8 mm.
3.00 ct.
12×7 mm.
3.12 ct.
12×9 mm.
3.44 ct.
14×8 mm.
3.47 ct.
13×9 mm.
4.11 ct.
14×9 mm.
4.25 ct.
15×9 mm.
5.06 ct.
14×10 mm.
5.41 ct.
13×11 mm.
5.65 ct.
15×10 mm.
5.75 ct.
16×9 mm.
5.86 ct.
16×10 mm.
6.27 ct.
17×10 mm.
6.46 ct.
15×11 mm.
7.36 ct.
18×11 mm.
8.14 ct.
16×12 mm.
8.99 ct.
18×12 mm.
9.35 ct.
18×13 mm.
10.21 ct.
Emerald cut
MM Size
Carat Weight
3×2 mm.
0.10 ct.
3.5×2 mm.
0.12 ct.
4×2 mm.
0.15 ct.
4×3 mm.
0.20 ct.
5×3 mm.
0.29 ct.
5.5×3.5 mm.
0.46 ct.
6×4 mm.
0.50 ct.
6.5×4.5 mm.
0.75 ct.
6.7×4.5 mm.
0.88 ct.
7×5 mm.
1.00 ct.
7.3×5.3 mm.
1.25 ct.
7.5×5.5 mm.
1.50 ct.
8×6 mm.
1.75 ct.
8.5×6.5 mm.
2.00 ct.
MM Size
Carat Weight
9×7 mm.
2.50 ct.
10×7.5 mm.
3.00 ct.
9.5×7.5 mm.
3.21 ct.
10×8 mm.
3.79 ct.
11×9 mm.
5.21 ct.
12×8 mm.
5.34 ct.
12×10 mm.
6.00 ct.
14×8 mm.
6.25 ct.
13×9 mm.
6.38 ct.
14×10 mm.
8.48 ct.
13×11 mm.
9.13 ct.
14×12 mm.
11.26 ct.
16×12 mm.
14.22 ct.

Oval cut

MM Size
Carat Weight
4.5×3.5 mm.
0.21 ct.
5×3 mm.
0.21 ct.
5.5×3.5 mm.
0.33 ct.
5×4 mm.
0.35 ct.
6×4 mm.
0.50 ct.
6×5 mm.
0.61 ct.
6.5×4.5 mm.
0.65 ct.
7×5 mm.
0.75 ct.
7.7×5.7 mm.
1.00 ct.
8×6 mm.
1.25 ct.
9×6 mm.
1.41 ct.
8.5×6.5 mm.
1.50 ct.
9×7 mm.
2.00 ct.
MM Size
Carat Weight
10×8 mm.
2.50 ct.
10.5×8.5 mm.
2.88 ct.
12×8 mm.
3.00 ct.
11×9 mm.
3.85 ct.
12×10 mm.
5.05 ct.
14×10 mm.
5.81 ct.
13×11 mm.
6.05 ct.
14×12 mm.
8.21 ct.
15×12 mm.
8.76 ct.
16×12 mm.
9.32 ct.
16×14 mm.
11.88 ct.
18×13 mm.
12.86 ct.
20×15 mm.
14.96 ct.

Princess cut

MM Size
Carat Weight
1.5 mm.
0.015 ct.
1.75 mm.
0.03 ct.
2 mm.
0.06 ct.
2.25 mm.
0.08 ct.
2.5 mm.
0.10 ct.
2.75 mm.
0.13 ct.
3 mm.
0.18 ct.
3.25 mm.
0.26 ct.
3.5 mm.
0.29 ct.
3.75 mm.
0.31 ct.
4 mm.
0.39 ct.
4.25 mm.
0.44 ct.
4.5 mm.
0.50 ct.
4.75 mm.
0.64 ct.
5 mm.
0.75 ct.
5.25 mm.
0.90 ct.
5.5 mm.
1.00 ct.
5.75 mm.
1.11 ct.
6 mm.
1.25 ct.
6.25 mm.
1.39 ct.
MM Size
Carat Weight
6.5 mm.
1.50 ct.
6.75 mm.
1.75 ct.
7 mm.
2.00 ct.
7.25 mm.
2.01 ct.
7.5 mm.
2.50 ct.
7.75 mm.
2.74 ct.
8 mm.
3.00 ct.
8.25 mm.
3.24 ct.
8.5 mm.
3.67 ct.
8.75 mm.
4.10 ct.
9 mm.
4.12 ct.
9.5 mm.
5.09 ct.
9.75 mm.
5.36 ct.
10 mm.
5.62 ct.
10.25 mm.
5.76 ct.
10.5 mm.
5.99 ct.
11 mm.
7.44 ct.
11.5 mm.
9.44 ct.
12 mm.
9.52 ct.
Asscher cut
MM Size
Carat Weight
4 mm.
0.39 ct.
4.5 mm.
0.50 ct.
5 mm.
0.75 ct.
5.5 mm.
1.00 ct.
6 mm.
1.25 ct.
6.5 mm.
1.50 ct.
7 mm.
2.00 ct.
7.5 mm.
2.50 ct.
MM Size
Carat Weight
8 mm.
3.00 ct.
8.5 mm.
3.50 ct.
9 mm.
4.12 ct.
9.5 mm.
5.09 ct.
10 mm.
5.62 ct.
11 mm.
7.44 ct.
12 mm.
9.52 ct.
13 mm.
12.66 ct.
Radiant cut
MM Size
Carat Weight
5×3 mm.
0.31 ct.
4.5×3.5 mm.
0.34 ct.
6×3 mm.
0.41 ct.
6×4 mm.
0.50 ct.
6.5×4.5 mm.
0.75 ct.
7×5 mm.
1.00 ct.
7.3×5.5 mm.
1.25 ct.
7.5×5.8 mm.
1.50 ct.
8×6 mm.
2.00 ct.
8.5×6.5 mm.
2.25 ct.
9×7 mm.
2.50 ct.
9.5×7.5 mm.
3.00 ct.
10×7 mm.
3.31 ct.
MM Size
Carat Weight
10×8 mm.
3.50 ct.
11×9 mm.
5.05 ct.
12×9 mm.
6.06 ct.
11.5×10 mm.
6.45 ct.
13×9 mm.
6.54 ct.
12×10 mm.
6.79 ct.
14×10 mm.
8.47 ct.
13×11 mm.
9.33 ct.
13.5×11.5 mm.
10.19 ct.
15×11 mm.
11.48 ct.
14×12 mm.
12.14 ct.
16×12 mm.
14.22 ct.
Heart Shape
MM Size
Carat Weight
3.5 mm.
0.18 ct.
4 mm.
0.25 ct.
4.25 mm.
0.28 ct.
4.5 mm.
0.34 ct.
4.75 mm.
0.38 ct.
5 mm.
0.50 ct.
5.5 mm.
0.61 ct.
6 mm.
0.75 ct.
6.25 mm.
0.83 ct.
6.5 mm.
1.00 ct.
7 mm.
1.25 ct.
7.5 mm.
1.50 ct.
MM Size
Carat Weight
8 mm.
2.00 ct.
8.5 mm.
2.50 ct.
9 mm.
3.00 ct.
10 mm.
3.50 ct.
11 mm.
4.41 ct.
12 mm.
5.66 ct.
13 mm.
7.88 ct.
14 mm.
9.38 ct.
15 mm.
10.79 ct.
16 mm.
13.27 ct.
18 mm.
15.33 ct.
Marquise cut
MM Size
Carat Weight
3×1.5 mm.
0.025 ct.
3.5×1.75 mm.
0.065 ct.
3.5×2 mm.
0.07 ct.
4×2 mm.
0.10 ct.
3.75×1.75 mm.
0.11 ct.
4.25×2.25 mm.
0.12 ct.
5×2.5 mm.
0.14 ct.
5.5×2.75 mm.
0.16 ct.
5.5×3 mm.
0.18 ct.
5×3 mm.
0.20 ct.
6.5×3 mm.
0.23 ct.
6×3 mm.
0.25 ct.
7×3 mm.
0.30 ct.
7.5×3.5 mm.
0.33 ct.
7×4 mm.
0.34 ct.
8×4 mm.
0.50 ct.
8.75×4.25 mm.
0.70 ct.
9×4.5 mm.
0.75 ct.
MM Size
Carat Weight
9.5×4.7 mm.
0.85 ct.
10×5 mm.
1.00 ct.
11×5.5 mm.
1.25 ct.
11.5×6 mm.
1.33 ct.
12×6 mm.
1.50 ct.
13×6.5 mm.
2.00 ct.
14×7 mm.
2.50 ct.
15×7 mm.
3.00 ct.
14×8 mm.
3.00 ct.
15×7.5 mm.
3.25 ct.
15×8 mm.
3.44 ct.
16×8 mm.
3.86 ct.
16.5×8.25 mm.
4.00 ct.
17×8.5 mm.
4.88 ct.
17.5×10 mm.
5.50 ct.
20×8 mm.
7.08 ct.
20×10 mm.
7.94 ct.
20×11 mm.
9.50 ct.