Points to millimeters across
Type a value in pt to get it in mm instantly.
1.104mm
Nothing on our list is smaller: a pavé (melee) stone is 1.26× bigger. A well-cut round brilliant 1.104 mm across weighs about 0.005 ct.
Convert the other way: mm to pt
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 pt to mm
For a round brilliant: carats ≈ 0.00372 × diameter³ (diameter in mm), so diameter ≈ ∛(carats ÷ 0.00372).
Example: 0.5 pt = 1.10359 mm.
Every unit
That diamond in every unit
Tables
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 |
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 |
Quick answers
Quick answers
- How many mm is 1 pt?
- 1 pt is 1.39044 mm.
- How many mm is 10 pt?
- 10 pt is 2.99561 mm.
- How many mm is 0.5 pt?
- 0.5 pt is 1.10359 mm.
The units
About these units
Points (pt)
Hundredths of a carat: a 50 pointer is half a carat.
Millimeters across (mm)
The diameter of a round brilliant, girdle to girdle.
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