Gram to Carat Converter

Enter the value that you want to convert gram (g) to carat or carat to gram.

1 gram = 5.0000000 carat

Formula: carat = gram value × 5.0000000

gram to carat

Value

Result

50.00000car, ct

10 gram = 50.00000 carat

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Gram vs Carat

Understanding the Gram

Gram (g) is a unit of weight measurement. 1 gram is equal to 5.0000000 carat.

The Carat Explained

Carat (car, ct) is a unit of weight measurement. 1 carat is equal to 0.2000000 gram.

Understanding Weight Conversions

Weight unit conversions are among the most frequently performed in daily life. International commerce ships in metric tonnes and kilograms, while US domestic logistics uses pounds and ounces. Recipes from different countries use different systems — a European cake recipe in grams versus an American one in cups and ounces. Pharmacists convert between milligrams and grains for medication dosing. Athletes track body weight across metric and imperial systems depending on their country and sport federation requirements.

gram to carat metric conversion table

0.01 g	=	0.05000 car, ct
0.1 g	=	0.50000 car, ct
1 g	=	5.00000 car, ct
2 g	=	10.00000 car, ct
3 g	=	15.00000 car, ct
4 g	=	20.00000 car, ct
5 g	=	25.00000 car, ct
6 g	=	30.00000 car, ct
7 g	=	35.00000 car, ct
8 g	=	40.00000 car, ct
9 g	=	45.00000 car, ct
10 g	=	50.00000 car, ct
11 g	=	55.00000 car, ct
12 g	=	60.00000 car, ct
13 g	=	65.00000 car, ct
14 g	=	70.00000 car, ct
15 g	=	75.00000 car, ct
16 g	=	80.00000 car, ct
17 g	=	85.00000 car, ct
18 g	=	90.00000 car, ct

19 g	=	95.00000 car, ct
20 g	=	100.00000 car, ct
30 g	=	150.00000 car, ct
40 g	=	200.00000 car, ct
50 g	=	250.00000 car, ct
60 g	=	300.00000 car, ct
70 g	=	350.00000 car, ct
80 g	=	400.00000 car, ct
90 g	=	450.00000 car, ct
100 g	=	500.00000 car, ct
200 g	=	1000.00000 car, ct
300 g	=	1500.00000 car, ct
400 g	=	2000.00000 car, ct
500 g	=	2500.00000 car, ct
600 g	=	3000.00000 car, ct
700 g	=	3500.00000 car, ct
800 g	=	4000.00000 car, ct
900 g	=	4500.00000 car, ct
1000 g	=	5000.00000 car, ct

How to Convert Gram to Carat?

We can convert gram to carat by using an example.

Example:

Convert 20 Gram to Carat?

We know 1 Gram = 5.0000000 carat; 1 Carat = 0.2000000 gram.

20 gram = ___car, ct

20 × 5.0000000 = 100.00000 car, ct (we know 1 gram = 5.0000000 carat)

Answer:

20 gram = 100.00000 carat

How to Convert Grams to Carats (Step-by-Step)

Converting grams to carats is the most common calculation in gemology and jewelry. The metric carat is defined as exactly 0.2 grams, making the conversion simple: multiply by 5.

Identify the weight in grams (g) to convert.
Multiply the gram value by 5 to get carats.
Alternatively, divide grams by 0.2 for the same result.
Express with 2 decimal places for standard gemological precision.

💡 Tip: The conversion is beautifully simple: 1 g = 5 ct. So 0.4 g = 2 ct, 0.6 g = 3 ct, 1 g = 5 ct. Just multiply by 5.

Common Grams to Carat Conversions (Diamond & Gemstone Weights)

Typical gemstone weights in grams converted to carats for jewelry and gemological certification.

Gram	Carat	Note
0.04 g	0.2 ct	Small accent diamond
0.1 g	0.5 ct	Medium engagement diamond
0.2 g	1.0 ct	Classic 1 carat diamond
0.4 g	2.0 ct	Large engagement ring
0.6 g	3.0 ct	Significant gemstone
1.0 g	5.0 ct	Large sapphire/emerald
2.0 g	10.0 ct	Statement cocktail ring
5.0 g	25.0 ct	Museum-quality gem

Solved Examples: Grams to Carats

Question 1: A lab-grown diamond weighs 0.35 g on the scale. What is its carat weight for grading?

Solution:

Carats = 0.35 × 5

= 1.75 ct

Answer: 0.35 g = 1.75 carats — a significant lab-grown diamond.

Question 2: A jeweler has 8 g of small diamonds (melee). How many total carats?

Solution:

Carats = 8 × 5

= 40 ct total

Answer: 8 g of melee diamonds = 40 carats total weight.

Question 3: A sapphire weighs 1.2 g. Express in carats. If it's valued at $800/ct, what is it worth?

Solution:

Carats = 1.2 × 5 = 6 ct

Value = 6 × $800 = $4,800

Answer: 1.2 g = 6 carats, valued at $4,800.

Question 4: An emerald rough stone is 3.7 g. After cutting (losing ~60%), what carat weight remains?

Solution:

Total carats = 3.7 × 5 = 18.5 ct rough

After cutting: 18.5 × 0.40 = 7.4 ct finished

Answer: 3.7 g rough = 18.5 ct; after 60% loss = 7.4 ct finished emerald.

Practice Questions: Grams to Carats

Try solving these on your own to test your understanding:

Convert 0.5 g to carats. (Answer: 2.5 ct)
A ruby weighs 0.8 g. How many carats? (Answer: 4 ct)
Convert 2.5 g to carats. (Answer: 12.5 ct)
A diamond is 0.14 g. Express in carats. (Answer: 0.7 ct)
Convert 0.06 g to carats. (Answer: 0.3 ct)

Diamond Sizing: What Carat Weights Look Like

Carat weight doesn't directly translate to visual size because density varies. A 1 ct diamond (0.2 g) measures ~6.4mm diameter in round brilliant cut. A 2 ct diamond (0.4 g) is ~8.2mm — not twice the diameter because weight scales with volume (cubed). A 1 ct sapphire appears smaller than a 1 ct diamond because sapphires are denser. Always consider density when estimating appearance from weight.

Gemological Scales: Precision Requirements

Gemological scales must be accurate to 0.001 g (0.005 ct) for certification purposes. GIA (Gemological Institute of America) rounds carat weight to 2 decimal places, rounding down at the third decimal (a 1.499 ct stone is reported as 1.49 ct). This precision matters enormously because a 1.00 ct diamond sells for significantly more than a 0.99 ct diamond — the "magic number" effect in pricing.

Carat vs Karat: A Common Source of Confusion

Carat (ct) measures gemstone weight: 1 ct = 0.2 g. Karat (K or kt) measures gold purity: 24K = 99.9% pure gold. A "2 carat diamond in an 18 karat gold ring" means the stone weighs 0.4 g and the gold is 75% pure. In British English, both are sometimes spelled "carat," requiring context to distinguish. Abbreviations help: ct for weight, K/kt for gold purity.

Key Takeaways

Multiply grams by 5 to get carats (1 g = 5 ct).
1 carat = 0.2 g exactly — defined by international standard since 1907.
A 1 ct round diamond is ~6.4mm diameter; 2 ct is ~8.2mm (not double).
Gemological scales measure to 0.001 g precision (0.005 ct).
Carat (weight) ≠ karat (gold purity) — different measurements entirely.
Diamond prices per carat jump at "magic numbers" (0.5, 1.0, 1.5, 2.0 ct).

Gram to Carat Conversion Formula

carat = gram × 5.0000000

1 gram = 5.0000000 carat

1 carat = 0.2000000 gram

Reverse: gram = carat × 0.2000000

Frequently Asked Questions

How many carat are in 1 gram?

There are 5.0000000 carat in 1 gram. To convert gram to carat, multiply the value by 5.0000000.

How do I convert gram to carat?

Multiply your gram value by 5.0000000 to get the equivalent in carat. For example, 5 gram = 5 × 5.0000000 = 25.00000 carat.

How do I convert carat to gram?

Multiply your carat value by 0.2000000 to get the equivalent in gram. Alternatively, divide by 5.0000000.

What is 10 gram in carat?

10 gram is equal to 50.00000 carat.

What is 100 gram in carat?

100 gram is equal to 500.00000 carat.