Convert grains to kilograms for ammunition reloading, pharmaceutical dosing, and jewelry. Precise conversion factor: 1 grain = 0.00006479891 kg. Accurate calculator with industry examples.
1 grain equals 0.00006479873512869029 kilogram
Formula: kg = gr × 0.0000647989
The grain, an ancient unit of mass still widely used in ammunition reloading, pharmaceuticals, and precious metals, converts to kilograms at a precise rate of 1 grain = 0.00006479891 kilograms. This conversion is critical for professionals who must work across imperial and metric systems, where even small errors can affect ballistic performance, medication dosages, or gemstone valuations.
In ammunition reloading, a 1-grain error in powder charge can reduce velocity by 10-20 feet per second or create dangerous pressure spikes. In pharmaceuticals, grain-to-kilogram conversions ensure proper medication dosages for patients; historical medical records often specify doses in grains. For jewelers and precious metals dealers, accurate grain-to-kilogram conversion directly impacts pricing, with gold valued at approximately $65 per gram ($2,030 per kilogram), making precision essential for transactions worth thousands of dollars.
Reloaders must precisely measure gunpowder charges in grains, then convert to kilograms for record-keeping, load development documentation, and international ammunition specifications. Modern ballistic software often requires metric inputs, necessitating accurate grain-to-kilogram conversion. A single-grain variance in powder charge can affect accuracy, velocity, and safety. Professional reloaders maintain detailed logs in both systems for consistency and regulatory compliance.
Historical pharmaceutical literature extensively documents medication dosages in grains, particularly for older drugs and traditional preparations. Modern pharmacists must convert grain measurements from legacy prescriptions and historical medical records to kilograms for contemporary dispensing. Many medications—including aspirin, digitalis, and quinine—were historically dosed in grains. Accurate conversion ensures patient safety and proper historical research interpretation. Some traditional preparations and alternative medicine products still reference grain measurements.
| grains | kilograms |
|---|---|
| 10 gr | 0.000648 kg |
| 50 gr | 0.00324 kg |
| 100 gr | 0.00648 kg |
| 500 gr | 0.032399 kg |
| 1000 gr | 0.064799 kg |
Formula: kg = gr × conversion factor
The grain is a widely used unit for measuring weight. It is commonly used in various applications and industries worldwide.
The kilogram is a widely used unit for measuring weight. It is commonly used in various applications and industries worldwide.
This grain to kilogram 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 kilogram equals 15,432.358 grains (the inverse of 1 grain = 0.00006479891 kg). This is calculated by dividing 1 kg by the conversion factor. For practical purposes, reloaders remember that approximately 15,400 grains = 1 kg. This relationship is important when purchasing bulk gunpowder—a 1 kg container holds roughly 15,400 grains of powder, allowing reloaders to calculate how many rounds they can load from a given quantity.
Ammunition reloading relies on grain measurements because reloading scales have been calibrated in grains for over a century, and all published load data, cartridge specifications, and industry standards use grains. A single grain represents a manageable increment for powder charge adjustments (0.1 grain = 6.48 milligrams). Switching to kilograms would require expressing charges as 0.002916 kg—impractical for fine adjustments. Additionally, all reloading manuals, software, and international ammunition specifications reference grains, making it the universal language of the reloading community.
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