Milligram to Carat Converter
Convert Milligram (mg) to Carat (ct) instantly. 1 mg = 0.005 ct.
Mass Converter
26 units available
1 mg = 0.005 ct
Formula:
ct = mg × 0.005With your value: 1 mg = 0.005 ct
How big is that?
Everyday references on a logarithmic scale, all expressed in milligram so you can sanity-check the result.
Other Milligram to Carat conversions
Milligram to Carat Conversion Table
| Milligram (mg) | Carat (ct) |
|---|---|
| 0.5 | 0.0025 |
| 1 | 0.005 |
| 2 | 0.01 |
| 5 | 0.025 |
| 10 | 0.05 |
| 15 | 0.075 |
| 20 | 0.1 |
| 25 | 0.125 |
| 50 | 0.25 |
| 100 | 0.5 |
| 250 | 1.25 |
| 500 | 2.5 |
| 1000 | 5 |
Carat to Milligram Conversion Table
| Carat (ct) | Milligram (mg) |
|---|---|
| 0.5 | 100 |
| 1 | 200 |
| 2 | 400 |
| 5 | 1,000 |
| 10 | 2,000 |
| 15 | 3,000 |
| 20 | 4,000 |
| 25 | 5,000 |
| 50 | 10,000 |
| 100 | 20,000 |
| 250 | 50,000 |
| 500 | 100,000 |
| 1000 | 200,000 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Milligram (mg)
Mass
Traceable to the kilogram, defined by fixing the Planck constant at 6.626 070 15 × 10⁻³⁴ J·s. Avoirdupois masses derive from the 1959 international pound (0.453 592 37 kg exactly).
Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)
Bureau International des Poids et Mesures · Reviewed 2026-07-01
Carat (ct)
Mass
The metric carat is exactly 200 mg, agreed internationally in 1907.
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
How to Convert Milligram to Carat
To convert from Milligram (mg) to Carat (ct), multiply the value by 0.005.
Formula: ct = mg × 0.005
Reverse: mg = ct × 200
Step-by-Step Example
- Start with your value in Milligram. For example: 5 mg
- Multiply by the conversion factor: 5 x 0.005
- The result is: 0.025 ct
About Milligram
The milligram equals one thousandth of a gram and is the standard unit for drug dosage and nutrient quantities.
Common uses: medication dosage, nutrition labels, laboratory work.
About Carat
The carat equals 200 milligrams and is the standard unit for measuring gemstone weight.
Fun Fact: The word "carat" comes from the carob seed, which was used as a balance weight in ancient gem trading.
Common uses: gemstones, diamonds, jewelry.
Frequently Asked Questions
How many Carat are in 1 Milligram?
There are exactly 0.005 Carat in 1 Milligram. This means the conversion factor from Milligram to Carat is 0.005.
What is the formula to convert Milligram to Carat?
The formula to convert Milligram to Carat is: ct = mg × 0.005. For example, to convert 10 Milligram to Carat, you would multiply 10 by 0.005.
What is a Milligram?
The milligram equals one thousandth of a gram and is the standard unit for drug dosage and nutrient quantities.
What is a Carat?
The carat equals 200 milligrams and is the standard unit for measuring gemstone weight.
What are the common uses of Milligram?
The Milligram is commonly used in medication dosage, nutrition labels, laboratory work.
Related Mass Conversions
Cite this page
UnitConvertLab. (2026). Milligram to Carat converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/milligram-to-carat