Convert Carat to Milligram
Use this free converter to change carats (ct) into milligrams (mg). Carat and milligram both measure weight & mass. As a quick reference, 1 ct equals 200 mg, and 1 mg equals 0.005 ct.
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Milligram (mg)
200
1 ct = 200 mg
Weight & Mass conversion table
| Carat | Milligram |
|---|---|
| 0.01 | 2 |
| 0.1 | 20 |
| 0.5 | 100 |
| 1 | 200 |
| 2 | 400 |
| 3 | 600 |
| 5 | 1000 |
| 10 | 2000 |
| 20 | 4000 |
| 25 | 5000 |
| 50 | 10000 |
| 100 | 20000 |
| 1,000 | 200000 |
How to convert Carat to Milligram
Multiply the carat value by 200 to get milligrams.
- Enter the number of carats you want to convert.
- The converter instantly shows the equivalent value in milligrams.
- Worked example: 15 ct × 200 = 3000 mg.
- Use the swap button to reverse the conversion (milligram to carat).
About these units
Carat (ct)
- Definition
- A carat (ct) is a unit of mass for gemstones equal to exactly 200 milligrams.
- History
- It takes its name from the carob seed, once used as a counterweight, and was standardised at 0.2 g in 1907.
- Current use
- Carats express the weight of diamonds and other precious stones in the jewellery trade.
Milligram (mg)
- Definition
- A milligram (mg) is one thousandth of a gram, used for very small masses such as medication doses.
- History
- It is a standard metric subdivision using the prefix "milli-" (one thousandth).
- Current use
- Milligrams express drug dosages, vitamin content, and quantities in chemistry and pharmacology.
Frequently asked questions
How many milligrams are in a carat?
There are 200 mg in 1 ct. To convert, multiply the number of carats by 200.
How do I convert carats to milligrams?
Multiply the carat value by 200 to get milligrams. For example, 10 ct = 2000 mg.
Is this carat-to-milligram converter free?
Yes. This converter is completely free, runs entirely in your browser, and requires no sign-up. Your inputs never leave your device.
Convert Carat to other weight & mass units
| Unit | 1 Carat equals |
|---|---|
| Kilogram (kg) | 0.0002 kg |
| Gram (g) | 0.2 g |
| Milligram (mg) | 200 mg |
| Microgram (µg) | 200000 µg |
| Metric Ton (t) | 2.0000e-7 t |
| Pound (lb) | 0.00044092452 lb |
| Ounce (oz) | 0.0070547924 oz |
| Stone (st) | 0.000031494609 st |
| US Ton (ton) | 2.2046e-7 ton |
| Imperial Ton (long ton) | 1.9684e-7 long ton |