Carat to gram converter: 1 carat is 0.2 grams

By HeyGema™ · Updated

In short

1 carat = 0.2 grams. 1 gram = 5 carats. The carat is exactly 200 milligrams (0.2 grams).

Carat converter

1 carats = 0.2 grams

1 carat is exactly 200 milligrams (0.2 grams). A point is one hundredth of a carat.

Carats to grams

A carat is exactly 200 milligrams, which is 0.2 grams, so multiply carats by 0.2 for grams or divide grams by 0.2 (multiply by 5) for carats. The carat for gems is not the karat for gold: karat, with a k, measures gold purity out of 24.

0.01 carats
Grams: 0.002 grams
0.1 carats
Grams: 0.02 grams
0.25 carats
Grams: 0.05 grams
0.5 carats
Grams: 0.1 grams
0.75 carats
Grams: 0.15 grams
1 carat
Grams: 0.2 grams
1.5 carats
Grams: 0.3 grams
2 carats
Grams: 0.4 grams
3 carats
Grams: 0.6 grams
5 carats
Grams: 1 gram
10 carats
Grams: 2 grams
20 carats
Grams: 4 grams
50 carats
Grams: 10 grams
100 carats
Grams: 20 grams
500 carats
Grams: 100 grams
1,000 carats
Grams: 200 grams

Weight and size of common diamonds

For a sense of scale, this is what common round diamond weights come to in grams and milligrams, and how wide each stone is.

0.25 ct
In grams: 0.050 g
In milligrams: 50 mg
Round diamond size: 4.1 mm
0.5 ct
In grams: 0.10 g
In milligrams: 100 mg
Round diamond size: 5.1 mm
1 ct
In grams: 0.20 g
In milligrams: 200 mg
Round diamond size: 6.5 mm
2 ct
In grams: 0.40 g
In milligrams: 400 mg
Round diamond size: 8.1 mm
3 ct
In grams: 0.60 g
In milligrams: 600 mg
Round diamond size: 9.3 mm
5 ct
In grams: 1.00 g
In milligrams: 1000 mg
Round diamond size: 11.0 mm
10 ct
In grams: 2.00 g
In milligrams: 2000 mg
Round diamond size: 13.9 mm

Grams to carats

1 gram = 5 carats. For all weight units at once use the carat converter. For size instead of weight, see the carat to mm calculator.

Questions

1 carat is exactly 0.2 grams (200 milligrams).
A 2 carat diamond weighs 0.4 grams.
Carat (ct) is a unit of weight for gemstones, 0.2 grams. Karat (kt, k) measures the purity of gold: 24 karat is pure gold.

More size charts