Diamond carat weight estimator – Watch & Jewelry Exchange

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Round Cut Millimeters [mm]to carat weight

Stone Size In Mm

Carat weight

MM Size	Carat weight
0.8	0.0025
1	0.005
1.10	0.0075
1.15	0.0067
1.25	0.01
1.3	0.01
1.5	0.015
1.75	0.02
1.8	0.025
2	0.03
2.25	0.04
2.5	0.06
2.75	0.08
3	0.11
3.25	0.14
3.5	0.17
3.75	0.21
4	0.25
4.25	0.28
4.5	0.36
4.75	0.44
5	0.46
5.25	0.56
5.5	0.66
5.75	0.76
6	0.84
6.25	0.93
6.5	1.03
6.75	1.24

MM Size	Carat weight
7	1.28
7.25	1.49
7.5	1.67
7.75	1.75
8	2.04
8.25	2.11
8.5	2.43
8.75	2.55
9	2.75
9.25	3.05
9.5	3.35
9.75	3.61
10	3.87
10.25	4.16
10.5	4.41
10.75	4.57
11	4.91
11.25	5.49
11.5	5.85
12	6.84
12.25	7.26
12.5	7.36
12.75	7.52
13	8.51
13.5	9.53
14	10.49
15	12.89
16	16.06

MM Size	Carat weight
1.5	0.015
1.75	0.03
2	0.06
2.25	0.08
2.5	0.1
2.75	0.13
3	0.18
3.25	0.26
3.5	0.29
3.75	0.31
4	0.39
4.25	0.44
4.5	0.56
4.75	0.64
5	0.71
5.25	0.75
5.5	0.99
5.75	1.11
6	1.24
6.25	1.39

MM Size	Carat weight
6.5	1.59
6.75	1.75
7	1.96
7.25	2.01
7.5	2.4
7.75	2.74
8	3.01
8.25	3.24
8.5	3.67
8.75	4.1
9	4.12
9.5	5.09
9.75	5.36
10	5.62
10.25	5.76
10.5	5.99
11	7.44
11.5	9.44
12	9.52

MM Size	Carat weight
4	0.39
4.5	0.56
5	0.71
5.5	0.99
6	1.24
6.5	1.59
7	1.96
7.5	2.4

MM Size	Carat weight
8	3.01
8.5	3.67
9	4.12
9.5	5.09
10	5.62
11	7.44
12	9.52
13	12.66

MM Size	Carat weight
4	0.25
4.5	0.36
5	0.46
5.25	0.56
5.5	0.66
5.75	0.76
6	0.84
6.25	0.93
6.5	1.03
6.75	1.24
7	1.28
7.5	1.67

MM Size	Carat weight
8	2.04
8.5	2.43
9	2.75
9.5	3.35
10	3.87
10.5	4.41
11	4.91
11.5	5.85
12	6.84
13	8.51
14	10.49
15	12.89

MM Size	Carat weight
4.5 x 3.5	0.21
5 x 3	0.21
5 x 4	0.35
5.5 x 3.5	0.33
6 x 4	0.43
6.5 x 4.5	0.65
6 x 5	0.61
7 x 5	0.76
7.5 x 5.5	0.98
8 x 6	1.21
8.5 x 6.5	1.46
9 x 6	1.41
9 x 7	1.86

MM Size	Carat weight
10 x 8	2.54
10.5 x 8.5	2.88
11 x 9	3.85
12 x 8	2.99
12 x 10	5.05
14 x 10	5.81
13 x 11	6.05
14 x 12	8.21
15 x 12	8.76
16 x 12	9.32
16 x 14	11.88
18 x 13	12.86
20 x 15	14.96

MM Size	Carat weight
4.5 x 3.5	0.34
5 x 3	0.31
6 x 3	0.41
6 x 4	0.60
6.5 x 4.5	0.83
7 x 5	1.14
7.25 x 5.25	1.24
7.5 x 5.5	1.47
8 x 6	1.74
8.5 x 6.5	2.25
9 x 7	2.62
9.5 x 7.5	3.18
10 x 7	3.31

MM Size	Carat weight
10 x 8	3.49
11 x 9	5.05
11.5 x 10	6.45
12 x 9	6.06
12 x 10	6.79
13 x 9	6.54
13 x 11	9.33
13.5 x 11.5	10.19
14 x 10	8.47
14 x 12	12.14
15 x 11	11.48
16 x 12	14.22

MM Size	Carat weight
3 x 2	0.13
4 x 2.5	0.18
4 x 3	0.21
5 x 3	0.25
5 x 4	0.35
6 x 4	0.39
6.5 x 4.5	0.57
7 x 5	0.71
8 x 5	0.81
8.5 x 5.5	1.08
8 x 6	1.25
9 x 6	1.33
9 x 7	1.75
10 x 6	1.71
10 x 7	1.8
10 x 8	2.46
11 x 7.50	2.61
11 x 8	3
12 x 7	3.12

MM Size	Carat weight
12 x 8	3
12 x 9	3.44
13 x 8	2.98
14 x 8	3.47
13 x 9	4.11
14 x 9	4.25
15 x 9	5.06
14 x 10	5.41
13 x 11	5.65
15 x 10	5.75
15 x 11	7.36
16 x 9	5.86
16 x 10	6.27
16 x 12	8.99
17 x 10	6.46
18 x 11	8.14
18 x 12	9.35
18 x 13	10.21

MM Size	Carat weight
3.5	0.18
4	0.25
4.25	0.28
4.5	0.34
4.75	0.38
5	0.44
5.5	0.61
6	0.74
6.25	0.83
6.5	0.93
7	1.13
7.5	1.59

MM Size	Carat weight
8	1.71
9	2.41
9.5	2.9
10	3.16
11	4.41
12	5.66
13	7.88
14	9.38
15	10.79
16	13.27
18	15.33

MM Size	Carat weight
3 x 1.5	0.025
3.5 x 1.75	0.065
3.5 x 2	0.07
3.75 x 1.75	0.11
4 x 2	0.1
4.25 x 2.25	0.12
5 x 2.5	0.14
5 x 3	0.2
5.5 x 2.75	0.16
5.5 x 3	0.18
6 x 3	0.25
6.5 x 3	0.23
7 x 3	0.3
7 x 3.5	0.35
7 x 4	0.34
7.5 x 3.5	0.33
8 x 4	0.47
9 x 4.5	0.71
9 x 5	0.76

MM Size	Carat weight
9.5 x 5	0.85
10 x 5	0.95
11 x 5.5	1.25
11.5 x 6	1.33
12 x 6	1.62
12 x 6.5	1.71
13 x 6.5	2.11
14 x 7	2.48
15 x 7.5	3.09
14 x 8	3
15 x 7	3.12
15 x 8	3.44
16 x 8	3.86
17 x 8.5	4.88
17.5 x 10	5.5
20 x 8	7.08
20 x 10	7.94
20 x 11	9.5

MM Size	Carat weight
2.5	0.08
3	0.12
3.5	0.18
4	0.25
4.25	0.32
4.5	0.37
4.75	0.42
5	0.45
5.25	0.53
5.5	0.66
5.75	0.71
6	0.76
6.25	0.86
6.5	0.94
6.75	1.02

MM Size	Carat weight
7	1.11
7.25	1.32
7.5	1.45
7.75	1.69
8	1.79
8.25	1.86
9	2.15
9.25	2.54
9.75	3.25
10	3.52
11	4.74
12	6.03
13	8.12
14	9.83

MM Size	Carat weight
3	0.12
3.5	0.16
3.75	0.19
4	0.23
4.25	0.27
4.5	0.31
4.75	0.37
5	0.42
5.25	0.49
5.5	0.55
5.75	0.64
6	0.7

MM Size	Carat weight
6.25	0.75
6.5	0.91
6.75	0.98
7	1.1
7.5	1.21
8	1.75
9	2.35
11	3.66
12	4.9
13	6.42
15	9

MM Size	Carat weight
2 x 1	0.02
2 x 1.5	0.04
2 x 1.75	0.04
2.25 x 1.75	0.04
2.25 x 2	0.045
2.5 x 1	0.045
2.5 x 1.25	0.047
2.5 x 1.5	0.05
2.5 x 1.75	0.055
2.5 x 2	0.055
2.75 x 1.5	0.055
2.75 x 1.75	0.06
2.75 x 2	0.06
2.75 x 2.5	0.065
3 x 1	0.05
3 x 1.25	0.055
3 x 1.5	0.06
3 x 1.75	0.08
3 x 2	0.1
3 x 2.5	0.13
3.25 x 1.25	0.06
3.25 x 1.5	0.065
3.25 x 1.75	0.08
3.25 x 2.5	0.14
3.5 x 1	0.065
3.5 x 1.25	0.07
3.5 x 1.5	0.07
3.5 x 1.75	0.08
3.5 x 2	0.13
3.5 x 2.5	0.15
3.5 x 3	0.15

MM Size	Carat weight
3.75 x 1.5	0.14
3.75 x 2	0.145
4 x 1.25	0.075
4 x 1.5	0.08
4 x 1.75	0.11
4 x 2	0.14
4 x 3	0.2
4.5 x 1.5	0.1
4.5 x 1.75	0.14
4.5 x 2	0.17
4.5 x 2.5	0.2
4.5 x 3	0.285
4.5 x 3.5	0.3
4.75 x 1.5	0.27
4.75 x 2	0.28
5 x 1.5	0.14
5 x 1.75	0.15
5 x 2	0.19
5 x 2.5	0.24
5 x 3	0.3
5 x 3.5	0.33
5 x 4	0.4
5.5 x 1.75	0.16
5.5 x 2	0.18
5.5 x 2.5	0.23
5.5 x 3	0.3
5.5 x 3.5	0.33
6 x 1.75	0.28
6 x 2	0.3
6 x 2.5	0.33
6 x 3	0.4

MM Size	Carat weight
2 x 1.5 x 1	0.025
2.5 x 1.5 x 1	0.035
2.5 x 1.75 x 1	0.04
3 x 1.5 x 1	0.05
3 x 1.75 x 1.25	0.055
3 x 1.75 x 1.3	0.055
3 x 1.75 x 1.5	0.055
3 x 2 x 1	0.06
3 x 2 x 1.25	0.065
3 x 2 x 1.5	0.07
3 x 2 x 1.75	0.075
3 x 2.5 x 2	0.08
3.25 x 1.75 x 1	0.07
3.25 x 1.75 x 1.25	0.05
3.5 x 1.25 x 1	0.04
3.5 x 1.5 x 1	0.05
3.5 x 1.5 x 1.25	0.055
3.5 x 1.7 x 1.3	0.055
3.5 x 1.75 x 1	0.06
3.5 x 1.75 x 1.25	0.07
3.5 x 1.75 x 1.3	0.065
3.5 x 2 x 1.25	0.08
3.5 x 2 x 1.5	0.09
3.5 x 2.5 x 2	0.09
3.75 x 2 x 1.25	0.08
4 x 1.5 x 1	0.07
4 x 1.5 x 1.2	0.08
4 x 1.75 x 1.25	0.08
4 x 2 x 1.5	0.1
4 x 2.5 x 1.5	0.12
4 x 2.5 x 2	0.21
4 x 3 x 2	0.21
4.25 x 2 x 1.25	0.11

MM Size	Carat weight
4.25 x 2 x 1.5	0.13
4.25 x 2.5 x 1.25	0.13
4.25 x 2.5 x 1.5	0.135
4.5 x 1.75 x 1.25	0.15
4.5 x 2 x 1.5	0.12
4.5 x 2.3 x 1.8	0.16
4.5 x 2.5 x 2	0.15
4.5 x 2.75 x 1.75	0.15
4.5 x 3 x 2	0.16
4.5 x 3 x 2.5	0.16
4.75 x 2.5 x 1.5	0.15
4.75 x 3 x 2	0.18
5 x 2 x 1	0.14
5 x 2 x 1.25	0.15
5 x 2 x 1.5	0.15
5 x 2.3 x 1.8	0.16
5 x 2.5 x 1.5	0.2
5 x 2.5 x 2	0.21
5 x 2.75 x 2	0.21
5 x 3 x 2	0.25
5 x 3.5 x 2	0.26
5 x 4 x 3.5	0.28
5.5 x 2 x 1.5	0.18
5.5 x 2.5 x 1.75	0.23
5.5 x 2.5 x 2	0.23
5.5 x 3 x 2	0.26
5.5 x 3 x 2.25	0.26
5.5 x 4 x 2.5	0.28
6 x 2 x 1.5	0.3
6 x 2.5 x 1.5	0.3
6 x 3 x 2	0.3
6.5 x 2.5 x 2	0.3
6.5 x 3 x 2	0.32

MM Size	Carat weight
3 x 2	0.1
3.5 x 2	0.12
4 x 2	0.15
4 x 3	0.2
5 x 3	0.29
5.5 x 3.5	0.46
5.5 x 4	0.48
6 x 4	0.66
6.5 x 4.5	0.88
7 x 5	1.06
7.25 x 5.25	1.24
7.5 x 5.5	1.45
8 x 6	1.74
8.5 x 6.5	2.17

MM Size	Carat weight
9 x 7	2.62
9.5 x 7.5	3.21
10 x 7	3.01
10 x 8	3.79
11 x 9	5.21
12 x 8	5.34
12 x 10	6
13 x 9	6.38
14 x 8	6.25
14 x 10	8.48
13 x 11	9.13
14 x 12	11.26
16 x 12	14.22

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