Milligram is 0.001 gram units.
Milligrams to Carats Converter — mg to ct
Convert Milligram (mg) to Carat (ct) using the exact conversion factor (1 milligram = 0.005 carat). See the formula, worked examples, and conversion table.
Milligrams to Carats converter
Converter
Mass/Weight Converter
Convert SI mass, imperial weight, jewelry, atomic, and astronomy mass units.
Context values
Some unit families need one extra value for a physically accurate result.
A metric carat is exactly 200 milligrams.
Result = input x 1e-6 / 0.0002.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Milligrams to Carats
Weight conversions between Milligram and Carat come up constantly in everyday commerce, shipping, and cooking, since US packaging is usually labeled in pounds while most of the rest of the world uses kilograms. Specifically: Milligram is 0.001 gram units, and a metric carat is exactly 200 milligrams.
Formula
carats = milligrams × 0.005
This factor comes from each unit's defined relationship to the category's base unit: 1 milligram equals 0.000001 base units, and 1 carat equals 0.0002 base units, so dividing one by the other gives the direct milligram-to-carat factor of 0.005.
Simple example
1 mg × 0.005 = 0.005 ct
1 milligram = 0.005 carats.
Real-world example
50 mg × 0.005 = 0.25 ct
50 milligrams = 0.25 carats.
Conversion table
| Milligram (mg) | Carat (ct) |
|---|---|
| 1 mg | 0.005 ct |
| 5 mg | 0.025 ct |
| 10 mg | 0.05 ct |
| 25 mg | 0.125 ct |
| 50 mg | 0.25 ct |
| 100 mg | 0.5 ct |
Reverse conversion: Carat to Milligram
0.005 ct × 200 = 1 mg
0.005 carats = 1 milligrams.
milligrams = carats × 200
For a page dedicated to this direction, see Carat to Milligram.
Understanding the Milligram (mg)
Milligram is 0.001 gram units.
Understanding the Carat (ct)
A metric carat is exactly 200 milligrams.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many carats are in 1 milligram?
1 milligram equals 0.005 carats, using the exact defined conversion factor rather than an estimate.
How do I convert milligram to carat?
Multiply the milligram value by 0.005. The converter above does this instantly to whatever precision you set.
How do I convert carat back to milligram?
Use the reverse factor: 1 carat equals 200 milligrams. You can also use the swap control in the converter above to flip the direction instantly.
What is a milligram?
Milligram (mg) is a unit of mass/weight.
What is a carat?
Carat (ct) is a unit of mass/weight.
Is the milligram to carat conversion exact?
Yes. Both milligram and carat are defined by fixed standards rather than physical artifacts, so the factor of 0.005 used above is exact to as many digits as you choose to display.