A gram is one thousandth of a kilogram.
Grams to Grains Converter — g to gr
Convert Gram (g) to Grain (gr) using the exact conversion factor (1 gram = 15.43235835 grain). See the formula, worked examples, conversion table, history, and common uses.
Grams to Grains converter
Converter
Mass/Weight Converter
Convert SI mass, imperial weight, jewelry, atomic, and astronomy mass units.
Context values
Some unit families need one extra value for a physically accurate result.
A grain is exactly 64.79891 milligrams.
Result = input x 0.001 / 6.479891e-5.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Grams to Grains
Weight conversions between Gram and Grain come up constantly in everyday commerce, shipping, and cooking, since US packaging is usually labeled in pounds while most of the rest of the world uses kilograms. Gram is most often used for cooking and nutrition labeling worldwide (including in the us, alongside ounces).
Formula
grains = grams × 15.4323583529
This factor comes from each unit's defined relationship to the category's base unit: 1 gram equals 0.001 base units, and 1 grain equals 0.00006479891 base units, so dividing one by the other gives the direct gram-to-grain factor of 15.4323583529.
Simple example
1 g × 15.43235835 = 15.43235835 gr
1 gram = 15.43235835 grains.
Real-world example
50 g × 15.43235835 = 771.6179176 gr
50 grams = 771.6179176 grains.
Conversion table
| Gram (g) | Grain (gr) |
|---|---|
| 1 g | 15.43235835 gr |
| 5 g | 77.16179176 gr |
| 10 g | 154.3235835 gr |
| 25 g | 385.8089588 gr |
| 50 g | 771.6179176 gr |
| 100 g | 1,543.235835 gr |
Reverse conversion: Grain to Gram
15.43235835 gr × 0.06479891 = 0.9999999998 g
15.43235835 grains = 0.9999999998 grams.
grams = grains × 0.06479891
For a page dedicated to this direction, see Grain to Gram.
Understanding the Gram
Gram (g) measures mass. A gram is one-thousandth of a kilogram, the SI base unit of mass. It is classified as a SI derived (metric prefix) unit.
Where it's used: Standard small-mass unit worldwide
Uses of the Gram today
- Cooking and nutrition labeling worldwide (including in the US, alongside ounces)
- Precious metal and small-item weighing
- Scientific and laboratory measurement
History of the Gram
Originally defined in 1795 as the mass of one cubic centimeter of water, the gram follows directly from the kilogram (1/1000 of it) under the modern SI system, inheriting the kilogram's various historical and current definitions.
Historical origin. Gram was not the invention of a single named person; it developed through the process described above.
Understanding the Grain (gr)
A grain is exactly 64.79891 milligrams.
Gram — sources
- BIPM — The kilogram (SI base unit) — Basis for the gram as 1/1000 of the kilogram.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many grains are in 1 gram?
1 gram equals 15.43235835 grains, using the exact defined conversion factor rather than an estimate.
How do I convert gram to grain?
Multiply the gram value by 15.43235835. The converter above does this instantly to whatever precision you set.
How do I convert grain back to gram?
Use the reverse factor: 1 grain equals 0.06479891 grams. You can also use the swap control in the converter above to flip the direction instantly.
What is a gram?
Gram (g) measures mass. A gram is one-thousandth of a kilogram, the SI base unit of mass. It is classified as a SI derived (metric prefix) unit.
What is a grain?
Grain (gr) is a unit of mass/weight.
Is the gram to grain conversion exact?
Yes. Both gram and grain are defined by fixed standards rather than physical artifacts, so the factor of 15.43235835 used above is exact to as many digits as you choose to display.
Where is the gram still used today?
Standard small-mass unit worldwide