Carats to Grams Converter
Enter the weight in carats below to convert it to grams.
Convert Carats to Grams
Enter a value in carats (ct) to convert to grams (g).
Metric Carat to Gram Conversion Table
Table showing various metric carat measurements converted to grams. Click any preset value or arrow to load it into the converter.
How to Convert Carats to Grams
To convert carats to grams, multiply the weight by the following conversion ratio: 0.2 grams/metric carat.
Since one metric carat is equal to 0.2 grams, you can use this simple formula to convert:
The weight in grams is equal to the weight in carats multiplied by 0.2.
For example, here's how to convert 5 carats to grams using the formula above.
How Many Grams Are in a Metric Carat?
There are 0.2 grams in a metric carat, which is why we use this value in the formula above.
Our metric carat to gram calculator automatically converts your weight measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Carats and grams are both units used to measure weight. Keep reading to learn more about each unit.
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). [1]
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.
What Is a Gram?
A gram is a unit of weight equal to 1/1,000 of a kilogram (0.001 kg). Metric unit equal to one-thousandth of a kilogram (0.001 kg). [2]
The gram is classified as a metric and SI-compatible unit of weight. Grams can be abbreviated as g; for example, 1 gram can be written as 1 g.
When working with grams (g) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, grams (g) 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 carats (ct) and grams (g), keep full floating-point precision (1 ct = 0.2 g; 1 g = 5 ct) during intermediate calculations and round only the final gram figure to match your instrument tolerance.
More Carat & Gram Conversions
Need to calculate in the opposite direction? Use our grams to carats calculator to switch your starting unit immediately. You can also explore related tools such as converting grams to carats, converting ounces to grams, or converting kilograms to grams.
Convert from Carats
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Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Mass)·Mass & Weight Metrology Standard — Carats (ct) to Grams (g)
- [2]NIST HB 44 SpecificationNIST HB 44 (NIST Handbook 44 (Current Ed.))·Unit Specifications: Metric Carat (ct) & Gram (g)
- [3]BIPM ReferenceBIPM (SI Base Unit: Kilogram (kg))·Conversion Factors & Mathematical Basis (ct to g)