How many grains are in one gram?

One gram contains approximately 15.432 grains. The exact relationship since 1959 is 1 grain = 0.06479891 grams, making 1 gram = 15.43236 grains.

Is this conversion commonly needed?

Yes - frequently. Ammunition reloaders, archers, and anyone working with grain-specified materials need to convert to grams when using metric scales. It is one of the most practically important conversions in this entire table.

Why is the grain still used when grams are universal?

Historical infrastructure. Decades of ammunition reloading manuals, bullet specifications, and powder charge data use grains. Converting everything to grams would invalidate this accumulated knowledge base. The grain also produces cleaner whole numbers at ammunition scales (e.g., 150 grains vs. 9.72 grams).

Grains to Grams (gr to g) Converter

1 gr = 0.0648 g

1 Grain equals 0.0648 Grams (1 gr = 0.0648 g). Convert Grains to Grams with formula, table, and examples.

One grain equals approximately 0.06480 grams. The gram, the everyday metric mass unit, is about 15.43 times heavier than the grain. This conversion is the most frequently used grain conversion in practice: ammunition handloaders, pharmacists, and archers all need to translate between grain specifications and gram-based laboratory or digital scales. The exact definition since 1959 is 1 grain = 0.06479891 grams.

How to Convert Grains to Grams

g = gr × 0.06479891

Multiply the value in Grains by 0.06479891

Take your value in Grains
Multiply by 0.06479891
Read the result in Grams

Common Grains to Grams Conversions

Grains (gr)	Grams (g)	Status
1 gr	0.064799 g
5 gr	0.323995 g
10 gr	0.647989 g
15 gr	0.971984 g
20 gr	1.295978 g
50 gr	3.239946 g
55 gr	3.56394 g
62 gr	4.017532 g
77 gr	4.989516 g
100 gr	6.479891 g
115 gr	7.451875 g
124 gr	8.035065 g
147 gr	9.52544 g
168 gr	10.886217 g
200 gr	12.959782 g
230 gr	14.903749 g
300 gr	19.439673 g
437.5 gr	28.349523 g
480 gr	31.103477 g
500 gr	32.399455 g
1,000 gr	64.79891 g
5,000 gr	323.99455 g
7,000 gr	453.59237 g

Good to Know About Grains to Grams Conversion

The grain-to-gram conversion of approximately 0.0648 grams per grain (or 15.43 grains per gram) is arguably the single most important bridge between imperial and metric mass measurement in active professional use. While most metric-imperial conversions are needed only occasionally, the grain-gram conversion is used thousands of times daily by handloaders worldwide, making it a living, working conversion rather than a historical curiosity.

Grains to Grams: What You Need to Know

A 55-grain .223 Remington bullet weighs 3.56 grams. A 230-grain .45 ACP bullet weighs 14.90 grams. Powder charges of 25 grains weigh 1.62 grams. Digital reloading scales often display both units simultaneously, making real-time grain-to-gram conversion part of every handloader's routine. The conversion factor of 15.43 grains per gram is one of the most frequently used in practical measurement.

What is a Grain? gr

A grain is a unit of mass equal to exactly 64.79891 milligrams. It is the same in the avoirdupois, troy, and apothecaries' systems, derived from the 1959 international agreement defining the pound as exactly 0.45359237 kilograms.

Imperial Troy Apothecaries ammunition weight bullet measurement historical pharmacy

Learn more about Grain →

What is a Gram? g

A metric unit of mass equal to one thousandth of a kilogram. Widely used in cooking, nutrition labeling, and science.

Metric cooking nutrition labels postal weight

Learn more about Gram →

Going the other way? Use our Grams to Grains converter.

Grains to Grams FAQ

One gram contains approximately 15.432 grains. The exact relationship since 1959 is 1 grain = 0.06479891 grams, making 1 gram = 15.43236 grains.
Yes - frequently. Ammunition reloaders, archers, and anyone working with grain-specified materials need to convert to grams when using metric scales. It is one of the most practically important conversions in this entire table.
Historical infrastructure. Decades of ammunition reloading manuals, bullet specifications, and powder charge data use grains. Converting everything to grams would invalidate this accumulated knowledge base. The grain also produces cleaner whole numbers at ammunition scales (e.g., 150 grains vs. 9.72 grams).

Non-Frequently Asked Questions About Grains to Grams

Questions nobody should ask - but someone did.

Because the shooting world thinks in grains but the hardware world (electronics, sensors, calibration weights) works in grams. A dual-display scale bridges both communities. When a reloader places a bullet on the scale, they read '168.0 gr' and the scale simultaneously shows '10.886 g.' Both numbers describe the same bullet; the grain number is what goes in the reloading manual.
Many experienced handloaders have this number roughly in their heads, even if they do not recite it precisely. They know that 1 gram is 'about 15.4 grains' and use this for quick checks. A powder charge of 3.0 grams is 'about 46 grains,' which they confirm on their scale. The conversion becomes intuitive through daily use.
A 150-grain bullet would become a 9.72-gram bullet. A 42.0-grain powder charge would become 2.72 grams. The numbers work but lack the clean whole-number appeal that grains provide. More critically, every reloading manual, every load recipe, and every ballistic table would need rewriting. The cost of switching exceeds any benefit, so grains endure.