How to Convert Carats to Micrograms (ct to µg)
Weight units matter at the wet market, where older stalls and Chinese medical halls still quote prices per kati or tael, and when following American recipes in ounces and pounds. This guide shows how to convert carats into micrograms by hand, with examples and a quick-reference table.
The conversion
To convert carats to micrograms, multiply the value by 200,000. To go the other way, divide by the same number (or multiply by 5.000000e-06). For a quick estimate, multiply by about 200,000.
Micrograms = carats × 200,000
Worked examples
- 3 ct = 600,000 µg
- 12.5 ct = 2,500,000 µg
- 75 ct = 15,000,000 µg
Carats to Micrograms table
| Carats | Micrograms |
|---|---|
| 1 ct | 200,000 µg |
| 2 ct | 400,000 µg |
| 5 ct | 1,000,000 µg |
| 10 ct | 2,000,000 µg |
| 20 ct | 4,000,000 µg |
| 25 ct | 5,000,000 µg |
| 50 ct | 10,000,000 µg |
| 100 ct | 20,000,000 µg |
| 250 ct | 50,000,000 µg |
| 500 ct | 100,000,000 µg |
| 1,000 ct | 200,000,000 µg |
Common questions
Is ct to µg exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the Micrograms to Carats converter.
Mistakes to avoid
Dropping the units
A bare number without a unit is easy to misread later. Always write the unit with the result.
Rounding the factor too early
Using 3 instead of 3.28 for feet per metre introduces an error of almost 9% before you have started.
Multiplying when you should divide
Converting to a smaller unit gives a bigger number, and converting to a larger unit gives a smaller one. If your answer moves the wrong way, you have inverted the factor.
Background
Unit conversion is simply multiplication by a fixed ratio. The ratio between two units of the same quantity never changes, so once you know it you can convert any value in either direction.
For everyday use, three or four significant figures are usually enough. Engineering, science and trade documents may need more, and rounding should happen only at the end of a calculation.
Singapore adopted the metric system in the 1970s, replacing imperial units and traditional Chinese measures in most official uses. Metric units are now standard in schools, trade and government, but older units survive in property, markets and imported goods.
For any value, use the Carats to Micrograms Converter or browse all weight converters.
Run your own numbers: Carats to Micrograms Converter