Carat to Microgram Converter
Convert Carat (ct) to Microgram (µg) instantly. 1 ct = 200,000 µg.
Mass Converter
26 units available
1 ct = 200,000 µg
Formula:
µg = ct × 200,000With your value: 1 ct = 200,000 µg
How big is that?
Everyday references on a logarithmic scale, all expressed in carat so you can sanity-check the result.
Other Carat to Microgram conversions
Carat to Microgram Conversion Table
| Carat (ct) | Microgram (µg) |
|---|---|
| 0.5 | 100,000 |
| 1 | 200,000 |
| 2 | 400,000 |
| 5 | 1,000,000 |
| 10 | 2,000,000 |
| 15 | 3,000,000 |
| 20 | 4,000,000 |
| 25 | 5,000,000 |
| 50 | 10,000,000 |
| 100 | 20,000,000 |
| 250 | 50,000,000 |
| 500 | 100,000,000 |
| 1000 | 200,000,000 |
Microgram to Carat Conversion Table
| Microgram (µg) | Carat (ct) |
|---|---|
| 0.5 | 2.500000e-6 |
| 1 | 5.000000e-6 |
| 2 | 1.000000e-5 |
| 5 | 2.500000e-5 |
| 10 | 5.000000e-5 |
| 15 | 7.500000e-5 |
| 20 | 1.000000e-4 |
| 25 | 0.000125 |
| 50 | 0.00025 |
| 100 | 0.0005 |
| 250 | 0.00125 |
| 500 | 0.0025 |
| 1000 | 0.005 |
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.
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
Microgram (µg)
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
How to Convert Carat to Microgram
To convert from Carat (ct) to Microgram (µg), multiply the value by 200,000.
Formula: µg = ct × 200,000
Reverse: ct = µg × 0.000005
Step-by-Step Example
- Start with your value in Carat. For example: 5 ct
- Multiply by the conversion factor: 5 x 200,000
- The result is: 1,000,000 µg
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.
About Microgram
The microgram (µg) equals one millionth of a gram. Vitamins, hormones and trace contaminants are dosed at this scale.
Fun Fact: Clinical writing spells out "microgram" rather than using µg to avoid dosing errors.
Common uses: pharmacology, vitamin dosing, toxicology.
Frequently Asked Questions
How many Microgram are in 1 Carat?
There are exactly 200,000 Microgram in 1 Carat. This means the conversion factor from Carat to Microgram is 200,000.
What is the formula to convert Carat to Microgram?
The formula to convert Carat to Microgram is: µg = ct × 200,000. For example, to convert 10 Carat to Microgram, you would multiply 10 by 200,000.
What is a Carat?
The carat equals 200 milligrams and is the standard unit for measuring gemstone weight.
What is a Microgram?
The microgram (µg) equals one millionth of a gram. Vitamins, hormones and trace contaminants are dosed at this scale.
What are the common uses of Carat?
The Carat is commonly used in gemstones, diamonds, jewelry.
Related Mass Conversions
Cite this page
UnitConvertLab. (2026). Carat to Microgram converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/carat-to-microgram