Milligrams to Carats Converter
Enter the weight in milligrams below to convert it to carats.
Convert Milligrams to Carats
Enter a value in milligrams (mg) to convert to carats (ct).
Milligram to Metric Carat Conversion Table
Table showing various milligram measurements converted to carats. Click any preset value or arrow to load it into the converter.
How to Convert Milligrams to Carats
To convert milligrams to carats, multiply the weight by the following conversion ratio: 0.005 carats/milligram.
Since one milligram is equal to 0.005 carats, you can use this simple formula to convert:
The weight in carats is equal to the weight in milligrams multiplied by 0.005.
For example, here's how to convert 5 milligrams to carats using the formula above.
How Many Carats Are in a Milligram?
There are 0.005 carats in a milligram, which is why we use this value in the formula above.
Our milligram to metric carat calculator automatically converts your weight measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Milligrams and carats are both units used to measure weight. Keep reading to learn more about each unit.
What Is a Milligram?
A milligram is a unit of weight equal to 1/1,000,000 of a kilogram (0.000001 kg). One-thousandth of a gram (10⁻⁶ kg). [1]
The milligram is classified as a metric and SI-compatible unit of weight. Milligrams can be abbreviated as mg; for example, 1 milligram can be written as 1 mg.
In the metric system, "milli" is the standard SI prefix for thousandths, or 10⁻³. This makes the milligram (mg) a convenient decimal multiple of the gram (g).
In practice, milligrams (mg) are widely used across fine-tolerance laboratory, analytical, and micro-scale weight measurements within SI metric workflows, engineering documentation, and technical data sheets.
What Is a Metric Carat?
A metric carat is a unit of weight equal to 1/5,000 of a kilogram (0.0002 kg). Gemstone mass unit equal to 0.2 grams (200 mg). [2]
The metric carat is classified as a metric and SI-compatible unit of weight. Carats can be abbreviated as ct; for example, 1 metric carat can be written as 1 ct.
When working with carats (ct) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, carats (ct) are widely used across fine-tolerance laboratory, analytical, and micro-scale weight measurements within SI metric workflows, engineering documentation, and technical data sheets.
When converting weight between milligrams (mg) and carats (ct), keep full floating-point precision (1 mg = 0.005 ct; 1 ct = 200 mg) during intermediate calculations and round only the final metric carat figure to match your instrument tolerance.
More Milligram & Carat Conversions
Need to calculate in the opposite direction? Use our carats to milligrams calculator to switch your starting unit immediately. You can also explore related tools such as converting carats to milligrams, converting milligrams to grams, or converting milligrams to micrograms.
Convert from Milligrams
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Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Mass)·Mass & Weight Metrology Standard — Milligrams (mg) to Carats (ct)
- [2]NIST HB 44 SpecificationNIST HB 44 (NIST Handbook 44 (Current Ed.))·Unit Specifications: Milligram (mg) & Metric Carat (ct)
- [3]BIPM ReferenceBIPM (SI Base Unit: Kilogram (kg))·Conversion Factors & Mathematical Basis (mg to ct)