Convert grains to grams for precious metals, jewelry, and ammunition weighing. Accurate calculator with 1 grain = 64.79891 milligrams. Essential for jewelers, metallurgists, and shooters.
1 grain equals 0.06479873512869029 gram
Formula: g = gr × 0.0647989
The grain-to-gram conversion is essential for professionals working with precious metals, gemstones, and ammunition. With 1 grain equaling precisely 64.79891 milligrams (0.06479891 grams), accuracy is critical in applications where even fractions of a gram affect value, purity calculations, and ballistic performance. Understanding this conversion bridges historical imperial measurements with modern metric standards used globally in jewelry, metallurgy, and firearms industries.
In precious metals trading, a single grain difference can represent hundreds of dollars in gold or silver transactions. Jewelers must convert grain measurements from antique specifications to modern metric standards for accurate pricing and production. Ammunition manufacturers rely on precise grain-to-gram conversions for powder charges, where variations of just a few grains significantly impact ballistic consistency, velocity, and safety. Legal compliance in international precious metals commerce requires metric documentation.
Jewelers and precious metals traders use grain-to-gram conversions when working with antique pieces, historical specifications, and international markets. Gold and silver are traditionally weighed in grains in English-speaking countries, but European and Asian markets use grams exclusively. Accurate conversion ensures correct pricing, purity calculations, and compliance with international hallmarking standards. A 1-carat diamond weighs approximately 3.086 grains, requiring precise conversion for gemstone and metal weight documentation.
Ammunition manufacturers and reloaders measure gunpowder charges in grains with extreme precision. Powder charge weight directly affects bullet velocity, accuracy, and pressure levels. Converting grain specifications to grams ensures consistency across different measurement systems and allows cross-reference with international ballistic data. Typical rifle cartridges use powder charges ranging from 20 to 65 grains, requiring accurate gram conversions for quality control and safety documentation.
| grains | grams |
|---|---|
| 10 gr | 0.647987 g |
| 50 gr | 3.239937 g |
| 100 gr | 6.479874 g |
| 500 gr | 32.399368 g |
| 1000 gr | 64.798735 g |
Formula: g = gr × conversion factor
The grain is a widely used unit for measuring weight. It is commonly used in various applications and industries worldwide.
The gram is a widely used unit for measuring weight. It is commonly used in various applications and industries worldwide.
This grain to gram 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 64.79891 milligrams, or 0.06479891 grams. This conversion applies to all grain measurements - troy grains, avoirdupois grains, and apothecaries' grains are all identical in weight. For practical purposes in precious metals work, 1 grain ≈ 0.0648 grams. In ammunition reloading, precision scales display both measurements simultaneously, allowing shooters to verify their powder charges in either unit.
Historical tradition in English-speaking countries established grains as the standard for precious metals weighing centuries before the metric system existed. The troy ounce (480 grains = 31.1035 grams) became the international standard for gold, silver, and gemstones because it provided convenient subdivision for hand-scale weighing. Today, despite global metric adoption, precious metals markets maintain grain and troy ounce pricing for historical continuity and market stability. Conversion to grams is straightforward: multiply grains by 0.06479891, or divide grams by 0.06479891 to get grains.
Browse our collection of 6 Weight converters. Each converter provides instant, accurate results for professional and academic use.