Milligrams to carats
Type a value in milligrams to see it in carats straight away, or type in the second box to convert back.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Type the value in the milligrams box.
- Read the result in carats as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
ct = mg × 0.005
Multiply the value in milligrams by 0.005 to get carats.
Example
To convert 25 mg to carats: 25 × 0.005 = 0.125 ct.
Conversion table
| Milligrams (mg) | Carats (ct) |
|---|---|
| 1 | 0.005 |
| 2 | 0.01 |
| 3 | 0.015 |
| 5 | 0.025 |
| 10 | 0.05 |
| 20 | 0.1 |
| 25 | 0.125 |
| 50 | 0.25 |
| 100 | 0.5 |
| 250 | 1.25 |
| 500 | 2.5 |
| 1,000 | 5 |
About the units
- Milligram
- One thousandth of a gram, used for medicine and supplement doses.
- Carat
- The metric carat for gemstones and diamonds, exactly 200 milligrams. It is unrelated to gold purity in karats.
Limits and caveats
- Results are rounded for display and computed with the browser's floating point precision (about 15 significant digits).
- Both unit factors are exact by their official definitions.
Questions about this tool
How many carats are in one milligram?
1 mg = 0.005 ct exactly.
How do I convert milligrams to carats?
Use ct = mg × 0.005. For example, 25 mg = 0.125 ct.
How many milligrams are in one carat?
1 ct = 200 mg.
Are mass and weight the same thing?
Strictly no: mass is the amount of matter, in kilograms, while weight is the force of gravity on it, in newtons. Scales display mass, so everyday language uses the two words interchangeably.
What is the difference between an ounce and a troy ounce?
An ordinary ounce is 28.349523125 grams and is used for food and goods, while a troy ounce is 31.1034768 grams and is used to price gold and silver.