A grain is exactly 64.79891 milligrams.
Grains to Carats
Convert grains (gr) to carats (ct) instantly. Free online weight converter with formulas, tables and examples.
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Convert metric, imperial, and nautical distance units.
Context values
Some unit families need one extra value for a physically accurate result.
A metric carat is exactly 200 milligrams.
ct = gr × 0.32399455
Results update instantly for Grains to Carats conversions.
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Formula
ct = gr × 0.32399455
gr = ct ÷ 0.32399455
Conversion table
| 1 gr | 0.323995 ct |
| 5 gr | 1.619973 ct |
| 10 gr | 3.239945 ct |
| 20 gr | 6.479891 ct |
| 50 gr | 16.199727 ct |
| 100 gr | 32.399455 ct |
| 500 gr | 161.997275 ct |
| 1000 gr | 323.994550 ct |
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Frequently asked questions
What is the source unit in this conversion?
The source unit is the grain (gr). A grain is exactly 64.79891 milligrams.
What is the destination unit in this conversion?
The destination unit is the carat (ct). A metric carat is exactly 200 milligrams.
How do I convert grains to carats?
Multiply the number of grains by 0.32399455 to get the equivalent value in carats. For example, 5 gr × 0.32399455 = 1.619973 ct.
Is the grain to carat conversion exact?
Yes. This converter uses a fixed factor of 0.32399455, so results are precise and consistent every time you use it.
Where is this conversion commonly used?
It's used in everyday measurement, shipping and logistics, scientific and industrial work, and any context where you need to switch between grain and carat values.
Can I convert carats back to grains?
Yes. Multiply the carats value by 3.08647167059, or divide it by 0.32399455, to convert back to grains.
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About this conversion
This page converts grains (gr) into carats (ct) using the Universal Converter's mass conversion engine.
Grain-to-Carat conversions are useful for everyday calculations, scientific work, shipping, and any task that mixes different weight or mass units.
The formula is ct = gr × 0.32399455, based on the standard definitions of grain and carat.
Because the conversion factor is fixed, results stay consistent and repeatable no matter how many times you calculate them.
Grain: A grain is exactly 64.79891 milligrams. Carat: A metric carat is exactly 200 milligrams.