Milligram to Carat Converter
Enter the value that you want to convert milligram (mg) to carat or carat to milligram.
1 milligram = 0.0050000 carat
Formula: carat = milligram value × 0.0050000
milligram to carat
10 milligram = 0.05000 carat
Popular Weight Converters:
How Milligram Relates to Carat
What is Milligram?
Milligram (mg) is a unit of weight measurement. 1 milligram is equal to 0.0050000 carat.
The Carat Explained
Carat (car, ct) is a unit of weight measurement. 1 carat is equal to 200.0000000 milligram.
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.
milligram to carat metric conversion table
| 0.01 mg | = | 0.00005 car, ct |
| 0.1 mg | = | 0.00050 car, ct |
| 1 mg | = | 0.00500 car, ct |
| 2 mg | = | 0.01000 car, ct |
| 3 mg | = | 0.01500 car, ct |
| 4 mg | = | 0.02000 car, ct |
| 5 mg | = | 0.02500 car, ct |
| 6 mg | = | 0.03000 car, ct |
| 7 mg | = | 0.03500 car, ct |
| 8 mg | = | 0.04000 car, ct |
| 9 mg | = | 0.04500 car, ct |
| 10 mg | = | 0.05000 car, ct |
| 11 mg | = | 0.05500 car, ct |
| 12 mg | = | 0.06000 car, ct |
| 13 mg | = | 0.06500 car, ct |
| 14 mg | = | 0.07000 car, ct |
| 15 mg | = | 0.07500 car, ct |
| 16 mg | = | 0.08000 car, ct |
| 17 mg | = | 0.08500 car, ct |
| 18 mg | = | 0.09000 car, ct |
| 19 mg | = | 0.09500 car, ct |
| 20 mg | = | 0.10000 car, ct |
| 30 mg | = | 0.15000 car, ct |
| 40 mg | = | 0.20000 car, ct |
| 50 mg | = | 0.25000 car, ct |
| 60 mg | = | 0.30000 car, ct |
| 70 mg | = | 0.35000 car, ct |
| 80 mg | = | 0.40000 car, ct |
| 90 mg | = | 0.45000 car, ct |
| 100 mg | = | 0.50000 car, ct |
| 200 mg | = | 1.00000 car, ct |
| 300 mg | = | 1.50000 car, ct |
| 400 mg | = | 2.00000 car, ct |
| 500 mg | = | 2.50000 car, ct |
| 600 mg | = | 3.00000 car, ct |
| 700 mg | = | 3.50000 car, ct |
| 800 mg | = | 4.00000 car, ct |
| 900 mg | = | 4.50000 car, ct |
| 1000 mg | = | 5.00000 car, ct |
How to Convert Milligram to Carat?
We can convert milligram to carat by using an example.
Example:
Convert 20 Milligram to Carat?
We know 1 Milligram = 0.0050000 carat; 1 Carat = 200.0000000 milligram.
20 milligram = ___car, ct
20 × 0.0050000 = 0.10000 car, ct (we know 1 milligram = 0.0050000 carat)
Answer:
20 milligram = 0.10000 carat
How to Convert Milligrams to Carats (Step-by-Step)
Converting milligrams to carats is essential in precision gemology for small stones, diamond melee (accent stones), and laboratory-grown gems. Since 1 carat = 200 mg, the conversion is: divide mg by 200.
- Identify the weight in milligrams (mg) to convert.
- Divide the mg value by 200 to get carats.
- Alternatively, multiply mg by 0.005.
- Express with 2-3 decimal places for gemological precision.
Common mg to Carat Conversions (Precision Gemology)
Small gemstone weights in milligrams converted to carats for grading, certification, and pricing of melee and accent stones.
| Milligram | Carat |
|---|---|
| 5 mg | 0.025 ct |
| 10 mg | 0.05 ct |
| 20 mg | 0.10 ct |
| 50 mg | 0.25 ct |
| 100 mg | 0.50 ct |
| 200 mg | 1.00 ct |
| 300 mg | 1.50 ct |
| 500 mg | 2.50 ct |
Solved Examples: mg to Carats
Question 1: A precision scale shows a diamond weighing 142 mg. What is its carat weight for the GIA report?
Solution:
Carats = 142 ÷ 200
= 0.71 ct
Answer: 142 mg = 0.71 carats.
Question 2: A jeweler has 50 melee diamonds totaling 350 mg. What is the average carat weight per stone?
Solution:
Total carats = 350 ÷ 200 = 1.75 ct
Average per stone = 1.75 ÷ 50 = 0.035 ct
Answer: Total: 1.75 ct. Average: 0.035 ct (3.5 points) per melee stone.
Question 3: A lab-grown diamond weighs 485 mg. Express in carats. Is it a "2 carat" stone?
Solution:
Carats = 485 ÷ 200 = 2.425 ct
Compare: 2.425 > 2.0
Answer: 485 mg = 2.425 ct — yes, this exceeds the 2-carat threshold.
Question 4: A sapphire lost 28 mg during polishing. How many carats were removed?
Solution:
Carats removed = 28 ÷ 200
= 0.14 ct
Answer: 28 mg = 0.14 carats lost during polishing.
Practice Questions: mg to Carats
Try solving these on your own to test your understanding:
- Convert 160 mg to carats. (Answer: 0.80 ct)
- A diamond weighs 75 mg. Express in carats. (Answer: 0.375 ct)
- Convert 420 mg to carats. (Answer: 2.10 ct)
- A melee stone is 8 mg. What is its carat weight? (Answer: 0.04 ct)
- Convert 250 mg to carats. (Answer: 1.25 ct)
Points and Carats: Understanding Gemological Subdivisions
1 carat = 100 "points" in gemology. A 0.25 ct diamond is called a "25 pointer." Since 1 ct = 200 mg, 1 point = 2 mg. Melee diamonds (under 0.20 ct) are typically sold by total carat weight rather than individually. A halo setting might use 20 stones at 4 mg each (0.02 ct / 2 points each) for a total melee weight of 80 mg = 0.40 ct. The mg-to-carat conversion is essential for pricing these tiny stones collectively.
Gemological Scales: Measuring to 0.01 ct Precision
Professional gemological scales measure to 0.1 mg precision (0.0005 ct). GIA rounds carat weight to 2 decimal places, with the third decimal determining rounding: 149 mg = 0.745 ct → reported as 0.74 ct (rounds down). 150 mg = 0.75 ct → reported as 0.75 ct. This matters enormously: a 0.99 ct diamond sells for much less per carat than a 1.00 ct diamond, and the difference is just 2 mg (0.01 ct).
Lab-Grown Diamonds: Precision Weighing at the mg Level
Lab-grown diamonds (CVD or HPHT method) are weighed at every production stage in mg. Rough lab-grown crystals typically lose 50-60% of weight during cutting. A 600 mg rough crystal might yield a 240-300 mg (1.2-1.5 ct) finished stone. Manufacturers target specific mg weights to produce stones just over carat thresholds (201+ mg for "1 carat", 401+ mg for "2 carat") to maximize value.
Key Takeaways
- Divide mg by 200 to get carats (1 ct = 200 mg exactly).
- 1 "point" = 0.01 ct = 2 mg in gemological terminology.
- GIA measures to 0.1 mg precision and rounds to 2 decimal places (ct).
- The 1.00 ct threshold (200 mg) dramatically affects diamond pricing.
- Melee diamonds (< 40 mg each) are sold by total carat weight.
- Lab-grown diamond manufacturers target weights just above carat thresholds (201+ mg).
Milligram to Carat Conversion Formula
carat = milligram × 0.0050000
1 milligram = 0.0050000 carat
1 carat = 200.0000000 milligram
Reverse: milligram = carat × 200.0000000
Frequently Asked Questions
How many carat are in 1 milligram?
There are 0.0050000 carat in 1 milligram. To convert milligram to carat, multiply the value by 0.0050000.
How do I convert milligram to carat?
Multiply your milligram value by 0.0050000 to get the equivalent in carat. For example, 5 milligram = 5 × 0.0050000 = 0.02500 carat.
How do I convert carat to milligram?
Multiply your carat value by 200.0000000 to get the equivalent in milligram. Alternatively, divide by 0.0050000.
What is 10 milligram in carat?
10 milligram is equal to 0.05000 carat.
What is 100 milligram in carat?
100 milligram is equal to 0.50000 carat.