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Diamond Conversion Chart

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Round Diamonds Carats to Millimeters (Plus or Minus 10%)

Use these charts to convert your MM Size in Diamonds to Carats. Some of our digital micrometers will convert this automatically.


MM CT   MM CT
1.0 .005   7.0 1.25
1.2 .0075   7.2 1.33
1.3 .01   7.4 1.50
1.5 .015   7.6 1.60
1.7 .02   7.8 1.75
1.8 .025   8.0 1.90
2.0 .03   8.2 2.00
2.1 .035   8.4 2.15
2.2 .04   8.6 2.25
2.4 .05   8.8 2.50
2.5 .06   9.0 2.65
2.7 .07   9.2 2.85
2.8 .08   9.4 3.00
2.9 .09   9.6 3.15
3.0 .10   9.8 3.35
3.1 .11   10.0 3.50
3.2 .12   10.2 3.75
3.3 .14   10.4 4.00
3.4 .15   10.6 4.25
3.5 .16   10.8 4.45
3.6 .17   11.0 4.75
3.7 .18   11.2 5.00
3.8 .20   11.4 5.25
3.9 .22   11.6 5.50
4.0 .23   11.75 5.75
4.1 .25   11.8 5.81
4.2 .30   11.9 6.00
4.0 .33   12.1 6.25
4.5 .35   12.5 7.00
4.6 .38   12.85 7.50
4.8 .40   13.0 7.75
4.9 .43   13.1 8.00
5.0 .47   13.25 8.23
5.2 .50   13.4 8.50
5.4 .60   13.5 8.75
5.5 .63   13.65 9.00
5.6 .65   13.75 9.20
5.8 .75   14.0 9.75
6.0 .80   14.5 10.34
6.2 .85   15.0 12.00
6.4 .95   15.4 12.92
6.5 1.00   15.5 13.17
6.6 1.10   16.0 14.50
6.8 1.17      


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