Grams to carats
Type a value in g to get it in ct instantly.
2.5ct
That's 1.08× as big as a two-carat diamond, while a five-carat diamond is 1.26× bigger. A well-cut round brilliant 8.759 mm across weighs about 2.5 ct.
Convert the other way: ct to g
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 g to ct
For a round brilliant: carats ≈ 0.00372 × diameter³ (diameter in mm), so diameter ≈ ∛(carats ÷ 0.00372).
Example: 0.5 g = 2.5 ct.
Every unit
That diamond in every unit
Tables
g to ct conversion table
| g | ct |
|---|---|
| 0.1 g | 0.5 ct |
| 0.2 g | 1 ct |
| 0.25 g | 1.25 ct |
| 0.3 g | 1.5 ct |
| 0.4 g | 2 ct |
| 0.5 g | 2.5 ct |
| 0.75 g | 3.75 ct |
| 1 g | 5 ct |
| 1.25 g | 6.25 ct |
| 1.5 g | 7.5 ct |
| 2 g | 10 ct |
| 2.5 g | 12.5 ct |
| 3 g | 15 ct |
| 4 g | 20 ct |
| 5 g | 25 ct |
ct to g conversion table
| ct | g |
|---|---|
| 0.1 ct | 0.02 g |
| 0.2 ct | 0.04 g |
| 0.25 ct | 0.05 g |
| 0.3 ct | 0.06 g |
| 0.4 ct | 0.08 g |
| 0.5 ct | 0.1 g |
| 0.75 ct | 0.15 g |
| 1 ct | 0.2 g |
| 1.25 ct | 0.25 g |
| 1.5 ct | 0.3 g |
| 2 ct | 0.4 g |
| 2.5 ct | 0.5 g |
| 3 ct | 0.6 g |
| 4 ct | 0.8 g |
| 5 ct | 1 g |
Quick answers
Quick answers
- How many ct is 1 g?
- 1 g is 5 ct.
- How many ct is 10 g?
- 10 g is 50 ct.
- How many ct is 0.5 g?
- 0.5 g is 2.5 ct.
The units
About these units
Grams (g)
The weight of the stone in grams.
Carats (ct)
The weight of the stone: 0.2 g per carat.
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