Carat to Gram Converter
Enter the value that you want to convert carat to gram (g) or gram to carat.
1 carat = 0.2000000 gram
Formula: gram = carat value × 0.2000000
carat to gram
10 carat = 2.00000 gram
Popular Weight Converters:
Converting Carat to Gram
The Carat Explained
Carat (car, ct) is a unit of weight measurement. 1 carat is equal to 0.2000000 gram.
Understanding the Gram
Gram (g) is a unit of weight measurement. 1 gram is equal to 5.0000000 carat.
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.
carat to gram metric conversion table
| 0.01 car, ct | = | 0.00200 g |
| 0.1 car, ct | = | 0.02000 g |
| 1 car, ct | = | 0.20000 g |
| 2 car, ct | = | 0.40000 g |
| 3 car, ct | = | 0.60000 g |
| 4 car, ct | = | 0.80000 g |
| 5 car, ct | = | 1.00000 g |
| 6 car, ct | = | 1.20000 g |
| 7 car, ct | = | 1.40000 g |
| 8 car, ct | = | 1.60000 g |
| 9 car, ct | = | 1.80000 g |
| 10 car, ct | = | 2.00000 g |
| 11 car, ct | = | 2.20000 g |
| 12 car, ct | = | 2.40000 g |
| 13 car, ct | = | 2.60000 g |
| 14 car, ct | = | 2.80000 g |
| 15 car, ct | = | 3.00000 g |
| 16 car, ct | = | 3.20000 g |
| 17 car, ct | = | 3.40000 g |
| 18 car, ct | = | 3.60000 g |
| 19 car, ct | = | 3.80000 g |
| 20 car, ct | = | 4.00000 g |
| 30 car, ct | = | 6.00000 g |
| 40 car, ct | = | 8.00000 g |
| 50 car, ct | = | 10.00000 g |
| 60 car, ct | = | 12.00000 g |
| 70 car, ct | = | 14.00000 g |
| 80 car, ct | = | 16.00000 g |
| 90 car, ct | = | 18.00000 g |
| 100 car, ct | = | 20.00000 g |
| 200 car, ct | = | 40.00000 g |
| 300 car, ct | = | 60.00000 g |
| 400 car, ct | = | 80.00000 g |
| 500 car, ct | = | 100.00000 g |
| 600 car, ct | = | 120.00000 g |
| 700 car, ct | = | 140.00000 g |
| 800 car, ct | = | 160.00000 g |
| 900 car, ct | = | 180.00000 g |
| 1000 car, ct | = | 200.00000 g |
How to Convert Carat to Gram?
We can convert carat to gram by using an example.
Example:
Convert 20 Carat to Gram?
We know 1 Carat = 0.2000000 gram; 1 Gram = 5.0000000 carat.
20 carat = ___g
20 × 0.2000000 = 4.00000 g (we know 1 carat = 0.2000000 gram)
Answer:
20 carat = 4.00000 gram
How to Convert Carats to Grams (Step-by-Step)
One carat equals exactly 0.2 grams (200 milligrams). This is the most direct carat conversion since the modern carat was defined as exactly 200 mg. Used in gem grading, jewelry manufacturing, and precious stone trading.
- Identify the weight in carats (ct) you want to convert.
- Multiply by 0.2 to get the value in grams.
- Alternatively, divide the carat value by 5.
Common Carat to Gram Conversions
Reference values for jewelry professionals and gem enthusiasts.
| Carat | Gram |
|---|---|
| 0.5 ct | 0.1 g |
| 1 ct | 0.2 g |
| 2 ct | 0.4 g |
| 5 ct | 1 g |
| 10 ct | 2 g |
| 50 ct | 10 g |
| 100 ct | 20 g |
Solved Examples: Carats to Grams
Question 1: A sapphire weighs 3.5 carats. What is its weight in grams?
Solution:
Weight in grams = 3.5 × 0.2
= 0.7 g
Answer: A 3.5-carat sapphire weighs 0.7 grams.
Question 2: A gem dealer has 250 carats of mixed stones. Total weight in grams?
Solution:
Weight in grams = 250 × 0.2
= 50 g
Answer: 250 carats = 50 grams.
Question 3: The Hope Diamond is 45.52 carats. Express in grams.
Solution:
Weight in grams = 45.52 × 0.2
= 9.104 g
Answer: The Hope Diamond weighs 9.1 grams.
Practice Questions: Carats to Grams
Try solving these on your own to test your understanding:
- Convert 7.5 carats to grams. (Answer: 1.5 g)
- A diamond is 0.25 ct. How many grams? (Answer: 0.05 g)
- Express 1,000 carats in grams. (Answer: 200 g)
- An emerald is 12 ct. Convert to grams. (Answer: 2.4 g)
- How many carats in 5 grams? (Answer: 25 ct)
History of the Metric Carat
The word "carat" comes from the carob seed, which ancient gem traders used as counterweights because carob seeds are remarkably uniform in weight (~200 mg each). In 1907, the Fourth General Conference on Weights and Measures standardized the metric carat at exactly 200 mg. Before this, the carat varied by region (190-210 mg), causing trade disputes.
Carat vs. Karat: Understanding the Difference
Carat (ct) measures gem weight: 1 ct = 0.2 g. Karat (K or kt) measures gold purity: 24K = pure gold, 18K = 75% gold. The words share an etymology (carob seed) but are entirely different measurements. A "2-carat 18-karat gold ring" has a 0.4 g gemstone set in 75% pure gold alloy. Never confuse them in documentation or jewelry specifications.
Key Takeaways
- 1 carat = 0.2 grams exactly (200 milligrams).
- 5 carats = 1 gram (easy mental math).
- Defined by the 1907 CGPM standard from carob seed weight.
- Carat (ct) = gem weight; Karat (K) = gold purity — different things.
- The Hope Diamond (45.52 ct) weighs only 9.1 grams.
- Multiply carats by 0.2, or divide by 5, to get grams.
Carat to Gram Conversion Formula
gram = carat × 0.2000000
1 carat = 0.2000000 gram
1 gram = 5.0000000 carat
Reverse: carat = gram × 5.0000000
Frequently Asked Questions
How many gram are in 1 carat?
There are 0.2000000 gram in 1 carat. To convert carat to gram, multiply the value by 0.2000000.
How do I convert carat to gram?
Multiply your carat value by 0.2000000 to get the equivalent in gram. For example, 5 carat = 5 × 0.2000000 = 1.00000 gram.
How do I convert gram to carat?
Multiply your gram value by 5.0000000 to get the equivalent in carat. Alternatively, divide by 0.2000000.
What is 10 carat in gram?
10 carat is equal to 2.00000 gram.
What is 100 carat in gram?
100 carat is equal to 20.00000 gram.