Points to carats
Type a value in pt to get it in ct instantly.
0.005ct
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: ct 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 ct
For a round brilliant: carats ≈ 0.00372 × diameter³ (diameter in mm), so diameter ≈ ∛(carats ÷ 0.00372).
Example: 0.5 pt = 0.005 ct.
Every unit
That diamond in every unit
Tables
pt to ct conversion table
| pt | ct |
|---|---|
| 0.1 pt | 0.001 ct |
| 0.2 pt | 0.002 ct |
| 0.25 pt | 0.0025 ct |
| 0.3 pt | 0.003 ct |
| 0.4 pt | 0.004 ct |
| 0.5 pt | 0.005 ct |
| 0.75 pt | 0.0075 ct |
| 1 pt | 0.01 ct |
| 1.25 pt | 0.0125 ct |
| 1.5 pt | 0.015 ct |
| 2 pt | 0.02 ct |
| 2.5 pt | 0.025 ct |
| 3 pt | 0.03 ct |
| 4 pt | 0.04 ct |
| 5 pt | 0.05 ct |
ct to pt conversion table
| ct | pt |
|---|---|
| 0.1 ct | 10 pt |
| 0.2 ct | 20 pt |
| 0.25 ct | 25 pt |
| 0.3 ct | 30 pt |
| 0.4 ct | 40 pt |
| 0.5 ct | 50 pt |
| 0.75 ct | 75 pt |
| 1 ct | 100 pt |
| 1.25 ct | 125 pt |
| 1.5 ct | 150 pt |
| 2 ct | 200 pt |
| 2.5 ct | 250 pt |
| 3 ct | 300 pt |
| 4 ct | 400 pt |
| 5 ct | 500 pt |
Quick answers
Quick answers
- How many ct is 1 pt?
- 1 pt is 0.01 ct.
- How many ct is 10 pt?
- 10 pt is 0.1 ct.
- How many ct is 0.5 pt?
- 0.5 pt is 0.005 ct.
The units
About these units
Points (pt)
Hundredths of a carat: a 50 pointer is half a carat.
Carats (ct)
The weight of the stone: 0.2 g per carat.
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