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Home » Diamond Education Center » Carat to MM weight conversion values

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.

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