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

Round Loose Diamond
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

cushion Loose Diamond
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

Pear Shape Loose Diamond
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

Emerald Loose Diamond
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

Oval Loose Diamond
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

Princess Cut Loose Diamond
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

Asscher Cut Loose Diamond
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

radiant shape Loose Diamond
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

Heart Shape Loose Diamond
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

marquise shape Loose diamond
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.
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