Carat to Milligram Converter
Enter the value that you want to convert carat to milligram (mg) or milligram to carat.
1 carat = 200.0000000 milligram
Formula: milligram = carat value × 200.0000000
carat to milligram
10 carat = 2000.00000 milligram
Popular Weight Converters:
Carat vs Milligram
The Carat Explained
Carat (car, ct) is a unit of weight measurement. 1 carat is equal to 200.0000000 milligram.
What is Milligram?
Milligram (mg) is a unit of weight measurement. 1 milligram is equal to 0.0050000 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 milligram metric conversion table
| 0.01 car, ct | = | 2.00000 mg |
| 0.1 car, ct | = | 20.00000 mg |
| 1 car, ct | = | 200.00000 mg |
| 2 car, ct | = | 400.00000 mg |
| 3 car, ct | = | 600.00000 mg |
| 4 car, ct | = | 800.00000 mg |
| 5 car, ct | = | 1000.00000 mg |
| 6 car, ct | = | 1200.00000 mg |
| 7 car, ct | = | 1400.00000 mg |
| 8 car, ct | = | 1600.00000 mg |
| 9 car, ct | = | 1800.00000 mg |
| 10 car, ct | = | 2000.00000 mg |
| 11 car, ct | = | 2200.00000 mg |
| 12 car, ct | = | 2400.00000 mg |
| 13 car, ct | = | 2600.00000 mg |
| 14 car, ct | = | 2800.00000 mg |
| 15 car, ct | = | 3000.00000 mg |
| 16 car, ct | = | 3200.00000 mg |
| 17 car, ct | = | 3400.00000 mg |
| 18 car, ct | = | 3600.00000 mg |
| 19 car, ct | = | 3800.00000 mg |
| 20 car, ct | = | 4000.00000 mg |
| 30 car, ct | = | 6000.00000 mg |
| 40 car, ct | = | 8000.00000 mg |
| 50 car, ct | = | 10000.00000 mg |
| 60 car, ct | = | 12000.00000 mg |
| 70 car, ct | = | 14000.00000 mg |
| 80 car, ct | = | 16000.00000 mg |
| 90 car, ct | = | 18000.00000 mg |
| 100 car, ct | = | 20000.00000 mg |
| 200 car, ct | = | 40000.00000 mg |
| 300 car, ct | = | 60000.00000 mg |
| 400 car, ct | = | 80000.00000 mg |
| 500 car, ct | = | 100000.00000 mg |
| 600 car, ct | = | 120000.00000 mg |
| 700 car, ct | = | 140000.00000 mg |
| 800 car, ct | = | 160000.00000 mg |
| 900 car, ct | = | 180000.00000 mg |
| 1000 car, ct | = | 200000.00000 mg |
How to Convert Carat to Milligram?
We can convert carat to milligram by using an example.
Example:
Convert 20 Carat to Milligram?
We know 1 Carat = 200.0000000 milligram; 1 Milligram = 0.0050000 carat.
20 carat = ___mg
20 × 200.0000000 = 4000.00000 mg (we know 1 carat = 200.0000000 milligram)
Answer:
20 carat = 4000.00000 milligram
How to Convert Carats to Milligrams (Step-by-Step)
One carat equals exactly 200 milligrams. This is the definition of the metric carat. This conversion is used in gemstone grading, laboratory gem identification, and precision jewelry manufacturing.
- Identify the weight in carats (ct) you want to convert.
- Multiply by 200 to get the value in milligrams.
- This is an exact conversion — 1 carat = 200 mg by definition.
Common Carat to Milligram Conversions
Reference values for gem grading and precision measurement.
| Carat | Milligram |
|---|---|
| 0.25 ct | 50 mg |
| 0.5 ct | 100 mg |
| 0.75 ct | 150 mg |
| 1 ct | 200 mg |
| 1.5 ct | 300 mg |
| 2 ct | 400 mg |
| 5 ct | 1,000 mg |
| 10 ct | 2,000 mg |
Solved Examples: Carats to Milligrams
Question 1: A jeweler needs to verify a 1.25-carat diamond on a milligram scale. What should it read?
Solution:
Weight in mg = 1.25 × 200
= 250 mg
Answer: A 1.25 ct diamond should weigh exactly 250 mg on a precision scale.
Question 2: A gem lab measures a stone at 180 mg. What is its carat weight?
Solution:
Weight in carats = 180 ÷ 200
= 0.90 ct
Answer: 180 mg = 0.90 carats.
Question 3: Convert 0.33 ct (a popular "one-third carat" diamond) to milligrams.
Solution:
Weight in mg = 0.33 × 200
= 66 mg
Answer: A 0.33-carat diamond weighs 66 milligrams.
Practice Questions: Carats to Milligrams
Try solving these on your own to test your understanding:
- Convert 3 carats to milligrams. (Answer: 600 mg)
- A gem is 0.15 ct. How many mg? (Answer: 30 mg)
- Express 7.5 ct in milligrams. (Answer: 1,500 mg)
- A stone weighs 425 mg. How many carats? (Answer: 2.125 ct)
- Convert 0.01 ct to milligrams. (Answer: 2 mg)
Precision Scales in Gemology
Gem labs use analytical balances accurate to 0.001 ct (0.2 mg). GIA (Gemological Institute of America) rounds carat weight to the nearest hundredth (two decimal places). A diamond reported as 1.00 ct has been measured between 0.995 and 1.004 ct (199.0-200.8 mg). This precision matters enormously for pricing — a 0.99 ct diamond costs significantly less than a 1.00 ct diamond due to psychological pricing thresholds.
Diamond Pricing and the Carat Threshold
Diamond prices jump at carat thresholds (0.5 ct, 1 ct, 2 ct). A 0.99 ct diamond (198 mg) may cost 10-20% less than a 1.00 ct diamond (200 mg) despite being only 2 mg lighter. Savvy buyers exploit this by purchasing just below thresholds — the visual difference is undetectable but the savings are substantial. This creates incentive for cutters to maximize carat weight, sometimes at the expense of ideal proportions.
Key Takeaways
- 1 carat = 200 milligrams exactly (by definition).
- Simply multiply carats by 200 to get mg.
- Gem labs measure to 0.001 ct precision (0.2 mg).
- Diamond prices jump at carat thresholds (0.5, 1.0, 1.5, 2.0 ct).
- 5 carats = 1,000 mg = 1 gram.
- The metric carat was standardized in 1907 at exactly 200 mg.
Carat to Milligram Conversion Formula
milligram = carat × 200.0000000
1 carat = 200.0000000 milligram
1 milligram = 0.0050000 carat
Reverse: carat = milligram × 0.0050000
Frequently Asked Questions
How many milligram are in 1 carat?
There are 200.0000000 milligram in 1 carat. To convert carat to milligram, multiply the value by 200.0000000.
How do I convert carat to milligram?
Multiply your carat value by 200.0000000 to get the equivalent in milligram. For example, 5 carat = 5 × 200.0000000 = 1000.00000 milligram.
How do I convert milligram to carat?
Multiply your milligram value by 0.0050000 to get the equivalent in carat. Alternatively, divide by 200.0000000.
What is 10 carat in milligram?
10 carat is equal to 2000.00000 milligram.
What is 100 carat in milligram?
100 carat is equal to 20000.00000 milligram.