Millimeters across to points
Type a value in mm to get it in pt instantly.
49.93pt
That's about the same as a half-carat diamond. A well-cut round brilliant 5.12 mm across weighs about 0.4993 ct.
Convert the other way: pt to mm
What it means
How big is that stone?
For well-cut round brilliants. Deep stones weigh more for their spread and shallow ones less; other shapes and gems differ.
The math
How to convert mm to pt
For a round brilliant: carats ≈ 0.00372 × diameter³ (diameter in mm), so diameter ≈ ∛(carats ÷ 0.00372).
Example: 5.12 mm = 49.929 pt.
Every unit
That diamond in every unit
Tables
mm to pt conversion table
| mm | pt |
|---|---|
| 3 mm | 10.044 pt |
| 3.77 mm | 19.9327 pt |
| 4.07 mm | 25.0799 pt |
| 4.32 mm | 29.9912 pt |
| 4.76 mm | 40.1203 pt |
| 5.12 mm | 49.929 pt |
| 5.86 mm | 74.8576 pt |
| 6.45 mm | 99.821 pt |
| 6.95 mm | 124.881 pt |
| 7.39 mm | 150.133 pt |
| 8.13 mm | 199.901 pt |
| 8.76 mm | 250.066 pt |
| 9.31 mm | 300.187 pt |
| 10.2 mm | 394.769 pt |
| 11 mm | 495.132 pt |
pt to mm conversion table
| pt | mm |
|---|---|
| 0.1 pt | 0.645385 mm |
| 0.2 pt | 0.813134 mm |
| 0.25 pt | 0.875923 mm |
| 0.3 pt | 0.930807 mm |
| 0.4 pt | 1.02449 mm |
| 0.5 pt | 1.10359 mm |
| 0.75 pt | 1.2633 mm |
| 1 pt | 1.39044 mm |
| 1.25 pt | 1.49781 mm |
| 1.5 pt | 1.59166 mm |
| 2 pt | 1.75185 mm |
| 2.5 pt | 1.88712 mm |
| 3 pt | 2.00536 mm |
| 4 pt | 2.20719 mm |
| 5 pt | 2.37762 mm |
Quick answers
Quick answers
- How many pt is 1 mm?
- 1 mm is 0.372 pt.
- How many pt is 10 mm?
- 10 mm is 372 pt.
- How many pt is 5.12 mm?
- 5.12 mm is 49.929 pt.
The units
About these units
Millimeters across (mm)
The diameter of a round brilliant, girdle to girdle.
Points (pt)
Hundredths of a carat: a 50 pointer is half a carat.
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