Convert grains to carats accurately for gemstone valuation, pharmaceutical dosing, and precious metal weighing. Precise calculator with professional examples.
1 grain equals 0.32399367564345144 carat
Formula: ct = gr × 0.323995
The grain and carat are both precise weight measurements used in specialized industries, with 1 grain equaling approximately 3.086 carats. Understanding this conversion is essential for jewelers, pharmacists, and gemologists who work with high-value materials where accuracy determines financial outcomes and patient safety.
In jewelry and gemology, a single carat difference can represent hundreds or thousands of dollars in value. Pharmaceutical dosing errors involving grain-to-carat conversions can result in incorrect medication strengths. Precious metal traders must maintain precision to avoid significant financial losses. The 1:3.086 ratio means small conversion errors compound into substantial discrepancies.
Jewelers and gemologists use both grains and carats when sourcing, valuing, and trading diamonds and precious stones. The carat is the international standard for gemstone weight, while grains appear in historical documentation and some specialty applications. Precise conversion ensures accurate pricing, certification, and customer communication across international markets.
Pharmaceutical formulations historically used grains as a dosage unit, particularly for older medications and prescriptions. Modern pharmacists must convert grain measurements to carats (or more commonly, to metric units like milligrams) for accurate dispensing. This conversion is critical for patient safety and regulatory compliance, especially with controlled substances.
| grains | carats |
|---|---|
| 10 gr | 3.239937 ct |
| 50 gr | 16.199684 ct |
| 100 gr | 32.399368 ct |
| 500 gr | 161.996838 ct |
| 1000 gr | 323.993676 ct |
Formula: ct = gr × conversion factor
The grain is a widely used unit for measuring weight. It is commonly used in various applications and industries worldwide.
The carat is a widely used unit for measuring weight. It is commonly used in various applications and industries worldwide.
This grain to carat converter uses high-precision conversion factors to ensure accurate results for professional and academic use.
Our calculator provides results with up to 10 decimal places for maximum accuracy.
One grain equals exactly 3.08647 carats. This precise relationship comes from the metric definitions: 1 grain = 64.79891 milligrams, and 1 carat = 200 milligrams (64.79891 ÷ 200 = 3.08647). For quick estimates, remember that 1 grain ≈ 3.1 carats, but always use the full precision for professional valuations and pharmaceutical dosing.
Grains appear in historical gemstone records, antique jewelry documentation, and legacy pharmaceutical formulations. Jewelry appraisers and gemologists must interpret old certificates and historical sales records that may list weights in grains. Additionally, understanding both units provides context for the international standardization of the carat and demonstrates professional knowledge of measurement history in the industry.
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