How many grains are in one pound?

One avoirdupois pound contains exactly 7,000 grains. This is a defined relationship, not an approximation.

The number 7,000 was established through centuries of English commercial practice. It divides conveniently: 7,000 / 16 = 437.5 grains per ounce, 7,000 / 256 = 27.34375 grains per dram. While these sub-ratios are not whole numbers, 7,000 itself was chosen for its compatibility with the ounce and pound structure.

Is the troy pound different?

Yes. The troy pound contains 5,760 grains (compared to 7,000 avoirdupois grains). The troy pound is lighter because it has only 12 ounces of 480 grains each, versus the avoirdupois pound's 16 ounces of 437.5 grains each.

Grains to Pounds (gr to lbs) Converter

1 gr = 0.0001 lbs

1 Grain equals 0.0001 Pounds (1 gr = 0.0001 lbs). Convert Grains to Pounds with formula, table, and examples.

One grain equals exactly 1/7,000 of an avoirdupois pound, or approximately 0.0001429 pounds. The 7,000 grains-per-pound ratio is one of the fundamental definitions of the avoirdupois system. This exact number - not rounded, not approximated - has been standard since the system was codified in the 14th century. It connects the smallest avoirdupois unit directly to the system's most familiar one.

How to Convert Grains to Pounds

lbs = gr ÷ 7,000

Divide the value in Grains by 7,000

Take your value in Grains
Divide by 7,000
Read the result in Pounds

Common Grains to Pounds Conversions

Grains (gr)	Pounds (lbs)	Status
1 gr	0.00014286 lbs
10 gr	0.00142857 lbs
50 gr	0.00714286 lbs
100 gr	0.01428571 lbs
500 gr	0.07142857 lbs
1,000 gr	0.14285714 lbs
3,500 gr	0.5 lbs
5,000 gr	0.71428571 lbs
7,000 gr	1 lbs
10,000 gr	1.42857143 lbs
14,000 gr	2 lbs
50,000 gr	7.14285714 lbs
100,000 gr	14.28571429 lbs

Good to Know About Grains to Pounds Conversion

The grain is remarkable for being the only unit identical across all three traditional English weight systems (troy, avoirdupois, and apothecary). This universality made it the natural foundation for the entire English measurement tradition. While ounces and pounds changed definition depending on whether you were weighing gold, groceries, or medicine, the grain remained constant: always 64.80 milligrams, everywhere, for everyone.

Grains to Pounds: What You Need to Know

A 1-pound box of ammunition contains roughly 7,000 grains worth of material (bullets, cases, primers, powder). A 150-grain bullet weighs 0.0214 pounds. When ammunition manufacturers calculate packaging weights for shipping, the grains-to-pounds conversion translates individual component weights to the pounds that logistics companies charge by.

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 Pound? lbs

An imperial and US customary unit of mass equal to approximately 453.6 grams or 16 ounces. Widely used in the US and UK for body weight and commerce.

Imperial Us-customary body weight (US/UK) food (US) commerce

Learn more about Pound →

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

Grains to Pounds FAQ

One avoirdupois pound contains exactly 7,000 grains. This is a defined relationship, not an approximation.
The number 7,000 was established through centuries of English commercial practice. It divides conveniently: 7,000 / 16 = 437.5 grains per ounce, 7,000 / 256 = 27.34375 grains per dram. While these sub-ratios are not whole numbers, 7,000 itself was chosen for its compatibility with the ounce and pound structure.
Yes. The troy pound contains 5,760 grains (compared to 7,000 avoirdupois grains). The troy pound is lighter because it has only 12 ounces of 480 grains each, versus the avoirdupois pound's 16 ounces of 437.5 grains each.

Non-Frequently Asked Questions About Grains to Pounds

Questions nobody should ask - but someone did.

It is certainly the roundest. Compare it to 437.5 grains per ounce or 27.34375 grains per dram. The 7,000-grain pound is the one level where the avoirdupois system produced a satisfying whole number. This is not coincidental - the pound was the anchor unit, and 7,000 was chosen deliberately.
An active competition shooter might fire 10,000 rounds per year with an average powder charge of 25 grains. That is 250,000 grains or about 35.7 pounds (16.2 kg) of smokeless powder annually. At roughly 25 dollars per pound, that is about 900 dollars in powder alone - a significant cost measured in both grains and dollars.
Marginally. 10,000 / 16 = 625 grains per ounce (a whole number). But redefining the pound would change the weight of every product in America, invalidate every scale calibration, and require Congressional action. The improvement in arithmetic would not justify the disruption. The 7,000-grain pound is here to stay.