⚖️ Grain Conversion Calculator
Convert the grain (a traditional unit of mass used in reloading, archery, and pharmacology) to and from grams, ounces, pounds, and more.
What the grain unit is
The grain is one of the oldest units of mass, historically based on the weight of a single grain of barley. Today it is standardized as exactly 1/7000 of an avoirdupois pound, equal to 64.79891 milligrams. It remains in everyday use for measuring gunpowder and bullet charges, arrow and archery equipment weight, and some pharmaceutical dosing references.
How this converter works
Every unit is first converted to grams using its exact standard conversion factor (for example, 1 ounce = 28.349523125 g and 1 pound = 453.59237 g), then converted from grams into your chosen target unit. This two-step approach through a common base unit keeps every conversion mathematically precise and consistent, whether you are converting grains to grams or ounces to carats.
Enter an amount, choose the unit you’re converting from and the unit you want to convert to, and the calculator instantly returns the converted value along with equivalents in grains and grams for quick reference. This tool is intended for general reference and educational purposes.