Carats to Grams
Convert gemstone and diamond carats to grams using the standard metric carat, not gold karat purity.
How to convert ct to g
To convert a value from carats (ct) to grams (g), enter the number in the converter above. Use the swap control if you need the reverse direction.
x is the source value in ct; y is the result in g.
Popular conversions
Quick answers for common ct to g values are available from the related conversion pages.
Use the related tools section for fixed-value conversions and the reverse direction.
Common conversion table
Quick reference table for common ct to g values:
| ct | g |
|---|---|
| 1 | 0.2 |
| 5 | 1 |
| 10 | 2 |
| 50 | 10 |
| 100 | 20 |
| 1,000 | 200 |
About carats
Carat (ct) — One metric carat is exactly 0.2 grams. In this converter, carat means gemstone weight, not gold karat purity.
Common uses: Carats are used for diamond and gemstone weight in jewelry, gemology, grading reports, and auction listings.
About grams
Gram (g) — One gram is one thousandth of a kilogram.
Common uses: Grams are common for recipes, nutrition labels, small parcels, lab measurements, and gemstone conversions.
Frequently Asked Questions
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