Grams to Grains Converter
High-precision converter for ballistics and reloading. Converts grams to grains with 4-decimal accuracy. Includes safety warnings and reference tables.
About
In the precision sports of archery and shooting, as well as gemology, weight measurement is critical. While the Metric system (grams) is the global standard, ballistics and projectile weights in the US and UK are almost exclusively measured in "Grains" (gr). A grain is a tiny unit of mass based historically on the weight of a barley seed.
This converter bridges the gap with extreme precision. Confusion between grams and grains can be catastrophic in reloading ammunition; a load measured in grams instead of grains could be 15 times overcharged. This tool emphasizes safety with a clear, distinct UI and high-precision decimal support (up to 4 places), ensuring enthusiasts can verify their load data or arrow weights with confidence.
Formulas
The Grain is defined as exactly 64.79891 milligrams. Therefore, the conversion factor from Grams to Grains is derived as:
The conversion formula used in this tool is:
Warning: Always cross-reference multiple data sources when reloading.
Reference Data
| Common Projectile | Weight (Grains gr) | Weight (Grams g) | Caliber Class |
|---|---|---|---|
| Light Target | 55 | 3.564 | .223 / 5.56 |
| Standard 9mm | 115 | 7.452 | 9mm Luger |
| Heavy 9mm | 147 | 9.525 | 9mm Subsonic |
| Standard Rifle | 150 | 9.720 | .308 Win |
| Heavy Rifle | 180 | 11.664 | .30-06 / .308 |
| Magnum Rifle | 200 | 12.960 | .300 Win Mag |
| Heavy Pistol | 230 | 14.904 | .45 ACP |
| Archery Point | 100 | 6.480 | Field Point |
| Archery Point | 125 | 8.100 | Broadhead |