Buyer's Guide

MM to Carat Diamond Conversion Chart

August 17, 2024

This article provides a guide to converting carat weights into dimensions in millimeters for various diamond cuts. It explains how different cuts, such as round, princess, baguette, and others, have unique carat-to-dimension ratios. The article aims to help readers understand how to estimate the size of a diamond in millimeters based on its carat weight, making it easier to select the right diamond for jewelry or other purposes. This resource is useful for those looking to understand diamond sizing across different shapes and cuts.

Additionally, if you’re interested in understanding how different diamond cuts compare in terms of size, surface area, and visual perception, then the linked article (“Which Cut is Bigger?”) is for you. In this comprehensive guide, you’ll discover how various cuts influence the perceived size and brilliance of a diamond, even when the carat weight remains constant. The article explores key factors like crown area, length-to-width ratios, and the visual impact of cuts such as Marquise, Oval, Round, and Princess. You’ll also find a detailed comparison table that illustrates how different carat weights are needed across cuts to match the visual size of a 1-carat Marquise cut. This resource is invaluable for making informed decisions about diamond cuts, helping you choose a diamond that maximizes both visual appeal and value.

Round Cut

MM SizeCarat Weight
0.80.0025 ct
10.005 ct
1.10.0075 ct
1.150.0067 ct
1.250.01 ct
1.30.01 ct
1.50.015 ct
1.750.02 ct
1.80.025 ct
20.03 ct
2.250.04 ct
2.50.06 ct
2.750.08 ct
30.11 ct
3.250.14 ct
3.50.17 ct
3.750.21 ct
40.25 ct
4.250.28 ct
4.50.36 ct
4.750.44 ct
50.46 ct
5.250.56 ct
5.50.66 ct
5.750.76 ct
60.84 ct
6.250.93 ct
6.51.03 ct
6.751.24 ct
71.28 ct
7.251.49 ct
7.51.67 ct
7.751.75 ct
82.04 ct
8.252.11 ct
8.52.43 ct
8.752.55 ct
92.75 ct
9.253.05 ct
9.53.35 ct
9.753.61 ct
103.87 ct
10.254.16 ct
10.54.41 ct
10.754.57 ct
114.91 ct
11.255.49 ct
11.55.85 ct
126.84 ct
12.257.26 ct
12.57.36 ct
12.757.52 ct
138.51 ct
13.59.53 ct
1410.49 ct
1512.89 ct
1616.06 ct

Oval Cut

MM SizeCarat Weight
4.5 x 3.50.21 ct
5 x 30.21 ct
5 x 40.35 ct
5.5 x 3.50.33 ct
6 x 40.43 ct
6.5 x 4.50.65 ct
6 x 50.61 ct
7 x 50.76 ct
7.5 x 5.50.98 ct
8 x 61.21 ct
8.5 x 6.51.46 ct
9 x 61.41 ct
9 x 71.86 ct
10 x 82.54 ct
10.5 x 8.52.88 ct
11 x 93.85 ct
12 x 82.99 ct
12 x 105.05 ct
14 x 105.81 ct
13 x 116.05 ct
14 x 128.21 ct
15 x 128.76 ct
16 x 129.32 ct
16 x 1411.88 ct
18 x 1312.86 ct
20 x 1514.96 ct

Princess Cut

MM SizeCarat Weight
1.50.015 ct
1.750.03 ct
20.06 ct
2.250.08 ct
2.50.10 ct
2.750.13 ct
30.18 ct
3.250.26 ct
3.50.29 ct
3.750.31 ct
40.39 ct
4.250.44 ct
4.50.56 ct
4.750.64 ct
50.71 ct
5.250.75 ct
5.50.99 ct
5.751.11 ct
61.24 ct
6.251.39 ct
6.51.59 ct
6.751.75 ct
71.96 ct
7.252.01 ct
7.52.40 ct
7.752.74 ct
83.01 ct
8.253.24 ct
8.53.67 ct
8.754.10 ct
94.12 ct
9.55.09 ct
9.755.36 ct
105.62 ct
10.255.76 ct
10.55.99 ct
117.44 ct
11.59.44 ct
129.52 ct

Pear Cut

MM SizeCarat Weight
3 x 20.13 ct
4 x 2.50.18 ct
4 x 30.21 ct
5 x 30.25 ct
5 x 40.35 ct
6 x 40.39 ct
6.5 x 4.50.57 ct
7 x 50.71 ct
8 x 50.81 ct
8.5 x 5.51.08 ct
8 x 61.25 ct
9 x 61.33 ct
9 x 71.75 ct
10 x 61.71 ct
10 x 71.80 ct
10 x 82.46 ct
11 x 7.52.61 ct
11 x 83.00 ct
12 x 73.12 ct
12 x 83.00 ct
12 x 93.44 ct
13 x 82.98 ct
14 x 83.47 ct
13 x 94.11 ct
14 x 94.25 ct
15 x 95.06 ct
14 x 105.41 ct
13 x 115.65 ct
15 x 105.75 ct
15 x 117.36 ct
16 x 95.86 ct
16 x 106.27 ct
16 x 128.99 ct
17 x 106.46 ct
18 x 118.14 ct
18 x 129.35 ct
18 x 1310.21 ct

Marquise Cut

MM SizeCarat Weight
3 x 1.50.025 ct
3.5 x 1.750.065 ct
3.5 x 20.07 ct
3.75 x 1.750.11 ct
4 x 20.10 ct
4.25 x 2.250.12 ct
5 x 2.50.14 ct
5 x 30.20 ct
5.5 x 2.750.16 ct
5.5 x 30.18 ct
6 x 30.25 ct
6.5 x 30.23 ct
7 x 30.30 ct
7 x 3.50.35 ct
7 x 43.40 ct
7.5 x 3.50.33 ct
8 x 40.47 ct
9 x 4.50.71 ct
9 x 50.76 ct
9.5 x 50.85 ct
10 x 50.95 ct
11 x 5.51.25 ct
11.5 x 61.33 ct
12 x 61.62 ct
12 x 6.51.71 ct
13 x 6.52.11 ct
14 x 72.48 ct
15 x 7.53.09 ct
14 x 83.00 ct
15 x 73.12 ct
15 x 83.44 ct
16 x 83.86 ct
17 x 8.54.88 ct
17.5 x 105.50 ct
20 x 87.08 ct
20 x 107.94 ct
20 x 119.50 ct

Cushion Cut

MM SizeCarat Weight
40.25 ct
4.50.36 ct
50.46 ct
5.250.56 ct
5.50.66 ct
5.750.76 ct
60.84 ct
6.250.93 ct
6.51.03 ct
6.751.24 ct
71.28 ct
7.51.67 ct
82.04 ct
8.52.43 ct
92.75 ct
9.53.35 ct
103.87 ct
10.54.41 ct
114.91 ct
11.55.85 ct
126.84 ct
138.51 ct
1410.49 ct
1512.89 ct

Heart Cut

MM SizeCarat Weight
3.50.18 ct
40.25 ct
4.250.28 ct
4.50.34 ct
4.750.38 ct
50.44 ct
5.50.61 ct
60.74 ct
6.250.83 ct
6.50.93 ct
71.13 ct
7.51.59 ct
81.71 ct
92.41 ct
9.52.90 ct
103.16 ct
114.41 ct
125.66 ct
137.88 ct
149.38 ct
1510.79 ct
1613.27 ct
1815.33 ct

Emerald Cut

MM SizeCarat Weight
3 x 20.10 ct
3.5 x 20.12 ct
4 x 20.15 ct
4 x 30.20 ct
5 x 30.29 ct
5.5 x 3.50.46 ct
5.5 x 40.48 ct
6 x 40.66 ct
6.5 x 4.50.88 ct
7 x 51.06 ct
7.25 x 5.251.24 ct
7.5 x 5.51.45 ct
8 x 61.74 ct
8.5 x 6.52.17 ct
9 x 72.62 ct
9.5 x 7.53.21 ct
10 x 73.01 ct
10 x 83.79 ct
11 x 95.21 ct
12 x 85.34 ct
12 x 106.00 ct
13 x 96.38 ct
14 x 86.25 ct
14 x 108.48 ct
13 x 119.13 ct
14 x 1211.26 ct
16 x 1214.22 ct

Radiant Cut

MM SizeCarat Weight
4.5 x 3.50.34 ct
5 x 30.31 ct
6 x 30.41 ct
6 x 40.60 ct
6.5 x 4.50.83 ct
7 x 51.14 ct
7.25 x 5.251.24 ct
7.5 x 5.51.47 ct
8 x 61.74 ct
8.5 x 6.52.25 ct
9 x 72.62 ct
9.5 x 7.53.18 ct
10 x 73.31 ct
10 x 83.49 ct
11 x 95.05 ct
11.5 x 106.45 ct
12 x 96.06 ct
12 x 106.79 ct
13 x 96.54 ct
13 x 119.33 ct
13.5 x 11.510.19 ct
14 x 108.47 ct
14 x 1212.14 ct
15 x 1111.48 ct
16 x 1214.22 ct

Asscher Cut

MM SizeCarat Weight
40.39 ct
4.50.56 ct
50.71 ct
5.50.99 ct
61.24 ct
6.51.59 ct
71.96 ct
7.52.40 ct
83.01 ct
8.53.67 ct
94.12 ct
9.55.09 ct
105.62 ct
117.44 ct
129.52 ct
1312.66 ct

Triangle Cut

MM SizeCarat Weight
2.50.08 ct
30.12 ct
3.50.18 ct
40.25 ct
4.250.32 ct
4.50.37 ct
4.750.42 ct
50.45 ct
5.250.53 ct
5.50.66 ct
5.750.71 ct
60.76 ct
6.250.86 ct
6.50.94 ct
6.751.02 ct
71.11 ct
7.251.32 ct
7.51.45 ct
7.751.69 ct
81.79 ct
8.251.86 ct
92.15 ct
9.252.54 ct
9.753.25 ct
103.52 ct
114.74 ct
126.03 ct
138.12 ct
149.83 ct

Trillion Cut

MM SizeCarat Weight
30.12 ct
3.50.16 ct
3.750.19 ct
40.23 ct
4.250.27 ct
4.50.31 ct
4.750.37 ct
50.42 ct
5.250.49 ct
5.50.55 ct
5.750.64 ct
60.70 ct
6.250.75 ct
6.50.91 ct
6.750.98 ct
71.10 ct
7.51.21 ct
81.75 ct
92.35 ct
113.66 ct
124.90 ct
136.42 ct
159.00 ct

Baguette Cut

MM SizeCarat Weight
2 x 10.02 ct
2 x 1.50.04 ct
2 x 1.750.04 ct
2.25 x 1.750.04 ct
2.25 x 20.045 ct
2.5 x 10.045 ct
2.5 x 1.250.047 ct
2.5 x 1.50.05 ct
2.5 x 1.750.055 ct
2.5 x 20.055 ct
2.75 x 1.50.055 ct
2.75 x 1.750.06 ct
2.75 x 20.06 ct
2.75 x 2.50.065 ct
3 x 10.05 ct
3 x 1.250.055 ct
3 x 1.50.06 ct
3 x 1.750.08 ct
3 x 20.1 ct
3 x 2.50.13 ct
3.25 x 1.250.06 ct
3.25 x 1.50.065 ct
3.25 x 1.750.08 ct
3.25 x 2.50.14 ct
3.5 x 10.065 ct
3.5 x 1.250.07 ct
3.5 x 1.50.07 ct
3.5 x 1.750.08 ct
3.5 x 20.13 ct
3.5 x 2.50.15 ct
3.5 x 30.15 ct
3.75 x 1.50.14 ct
3.75 x 20.145 ct
4 x 1.250.075 ct
4 x 1.50.08 ct
4 x 1.750.11 ct
4 x 20.14 ct
4 x 30.2 ct
4.5 x 1.50.1 ct
4.5 x 1.750.14 ct
4.5 x 20.17 ct
4.5 x 2.50.2 ct
4.5 x 30.285 ct
4.5 x 3.50.3 ct
4.75 x 1.50.27 ct
4.75 x 20.28 ct
5 x 1.50.14 ct
5 x 1.750.15 ct
5 x 20.19 ct
5 x 2.50.24 ct
5 x 30.3 ct
5 x 3.50.33 ct
5 x 40.4 ct
5.5 x 1.750.16 ct
5.5 x 20.18 ct
5.5 x 2.50.23 ct
5.5 x 30.3 ct
5.5 x 3.50.33 ct
6 x 1.750.28 ct
6 x 20.3 ct
6 x 2.50.33 ct
6 x 30.4 ct

Tapered Baguette Cut

MM SizeCarat Weight
2 x 1.5 x 10.025 ct
2.5 x 1.5 x 10.035 ct
2.5 x 1.75 x 10.04 ct
3 x 1.5 x 10.05 ct
3 x 1.75 x 1.250.055 ct
3 x 1.75 x 1.30.055 ct
3 x 1.75 x 1.50.055 ct
3 x 2 x 10.06 ct
3 x 2 x 1.250.065 ct
3 x 2 x 1.50.07 ct
3 x 2 x 1.750.075 ct
3 x 2.5 x 20.08 ct
3.25 x 1.75 x 10.07 ct
3.25 x 1.75 x 1.250.05 ct
3.5 x 1.25 x 10.04 ct
3.5 x 1.5 x 10.05 ct
3.5 x 1.5 x 1.250.055 ct
3.5 x 1.7 x 1.30.055 ct
3.5 x 1.75 x 10.06 ct
3.5 x 1.75 x 1.250.07 ct
3.5 x 1.75 x 1.30.065 ct
3.5 x 2 x 1.250.08 ct
3.5 x 2 x 1.50.09 ct
3.5 x 2.5 x 20.09 ct
3.75 x 2 x 1.250.08 ct
4 x 1.5 x 10.07 ct
4 x 1.5 x 1.20.08 ct
4 x 1.75 x 1.250.08 ct
4 x 2 x 1.50.1 ct
4 x 2.5 x 1.50.12 ct
4 x 2.5 x 20.21 ct
4 x 3 x 20.21 ct
4.25 x 2 x 1.250.11 ct
4.25 x 2 x 1.50.13 ct
4.25 x 2.5 x 1.250.13 ct
4.25 x 2.5 x 1.50.135 ct
4.5 x 1.75 x 1.250.15 ct
4.5 x 2 x 1.50.12 ct
4.5 x 2.3 x 1.80.16 ct
4.5 x 2.5 x 20.15 ct
4.5 x 2.75 x 1.750.15 ct
4.5 x 3 x 20.16 ct
4.5 x 3 x 2.50.16 ct
4.75 x 2.5 x 1.50.15 ct
4.75 x 3 x 20.18 ct
5 x 2 x 10.14 ct
5 x 2 x 1.250.15 ct
5 x 2 x 1.50.15 ct
5 x 2.3 x 1.80.16 ct
5 x 2.5 x 1.50.2 ct
5 x 2.5 x 20.21 ct
5 x 2.75 x 20.21 ct
5 x 3 x 20.25 ct
5 x 3.5 x 20.26 ct
5 x 4 x 3.50.28 ct
5.5 x 2 x 1.50.18 ct
5.5 x 2.5 x 1.750.23 ct
5.5 x 2.5 x 20.23 ct
5.5 x 3 x 20.26 ct
5.5 x 3 x 2.250.26 ct
5.5 x 4 x 2.50.28 ct
6 x 2 x 1.50.3 ct
6 x 2.5 x 1.50.3 ct
6 x 3 x 20.3 ct
6.5 x 2.5 x 20.3 ct
6.5 x 3 x 20.32 ct

Trapezoid Cut

Carat Weight Long Side LengthVertical HeightShort Side Length
0.14 - 0.16 ct3.60 - 3.80 mm2.60 - 2.70 mm2.60 - 2.75 mm
0.16 - 0.175 ct3.60 - 3.80 mm2.80 - 3.00 mm2.60 - 2.75 mm
0.155 - 0.17 ct3.90 - 4.10 mm2.70 - 2.80 mm2.90 - 3.00 mm
0.19 - 0.22 ct3.90 - 4.10 mm2.90 - 3.10 mm2.90 - 3.00 mm
0.16 - 0.185 ct4.10 - 4.20 mm2.70 - 2.80 mm3.10 - 3.20 mm
0.20 - 0.22 ct4.20 - 4.30 mm2.90 - 3.10 mm3.20 - 3.45 mm
0.19 - 0.22 ct4.40 - 4.50 mm2.70 - 2.80 mm3.30 - 3.50 mm
0.215 - 0.235 ct4.40 - 4.50 mm2.90 - 3.10 mm3.30 - 3.50 mm
0.20 - 0.22 ct4.60 - 4.80 mm2.70 - 2.80 mm3.60 - 3.90 mm
0.22 - 0.235 ct4.60 - 4.80 mm2.90 - 3.10 mm3.60 - 3.90 mm
0.20 - 0.225 ct4.90 - 5.20 mm2.70 - 2.80 mm3.90 - 4.10 mm
0.25 - 0.275 ct4.90 - 5.20 mm2.90 - 3.10 mm3.90 - 4.10 mm
0.29 - 0.32 ct4.90 - 5.20 mm3.20 - 3.30 mm3.95 - 4.20 mm
0.275 - 0.32 ct5.40 - 5.60 mm2.90 - 3.10 mm4.30 - 4.50 mm
0.32 - 0.375 ct5.40 - 5.60 mm3.20 - 3.40 mm4.00 - 4.40 mm
0.29 - 0.375 ct5.90 - 6.20 mm2.90 - 3.10 mm4.70 - 5.00 mm
0.375 - 0.425 ct5.90 - 6.20 mm3.30 - 3.50 mm4.90 - 5.10 mm
0.40 - 0.50 ct5.90 - 6.20 mm3.60 - 4.00 mm4.50 - 4.80 mm
0.425 - 0.55 ct6.40 - 6.60 mm3.80 - 4.20 mm4.80 - 5.20 mm
0.485 - 0.60 ct6.40 - 6.60 mm4.00 - 4.30 mm4.80 - 5.20 mm
0.55 - 0.65 ct6.80 - 7.20 mm4.00 - 4.30 mm5.00 - 5.50 mm

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