How many grains are in one pound?

Exactly 7000 grains equal 1 avoirdupois pound. This is a defined, exact value — there is no rounding involved.

Are grains still used today?

Yes. Grains are the standard unit for bullet and powder weights in ammunition reloading, arrow weights in archery, and gemstone weights in some markets. They also appear in older pharmaceutical and apothecary measurements.

What is the difference between a grain and a gram?

A grain (gr) equals approximately 0.06479891 grams. It is much smaller than a gram — about 15.43 grains make one gram.

Can I convert fractional pounds?

Yes. Enter any decimal value such as 0.5 or 2.75 and the tool will compute the exact grain equivalent.

Is this the avoirdupois pound or the troy pound?

This converter uses the avoirdupois pound (the standard pound used in everyday commerce in the US and UK), where 1 lb = 7000 grains. The troy pound equals 5760 grains — use a separate troy converter for precious metals weighed in troy pounds.

Pounds to Grains Converter

Enter a value in pounds and instantly get the equivalent in grains — exact conversion using 1 lb = 7000 gr.

Pounds to Grains

Pounds (lb)

Result in Grains (gr)

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Grains to Pounds (Reverse)

Grains (gr)

Result in Pounds (lb)

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Common Pound to Grain Reference

Pounds (lb)	Grains (gr)	Common Use
0.01	70	Light pistol powder charge
0.025	175	Standard 9mm bullet weight
0.1	700	Heavy rifle bullet weight range
0.5	3,500	Half-pound measurement
1	7,000	One avoirdupois pound (exact)
5	35,000	Bulk powder measure

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Summary

This tool converts a mass expressed in pounds (lb) to grains (gr) using the exact, internationally defined factor of 7000 grains per pound. The grain is one of the oldest units of mass still in everyday use, common in ammunition reloading, archery arrow weights, gemstone trading, and pharmaceutical compounding. Because the conversion factor is a whole number, results are always exact — no rounding errors for whole-pound inputs.

How it works

Type a value in pounds into the input field.
The tool multiplies the value by 7000 (the exact conversion factor).
The equivalent in grains appears instantly below.
Use the reverse field to convert grains back to pounds.
Click "Copy" to copy either result to your clipboard.

Use cases

Calculate bullet or powder charge weights for ammunition reloading.
Convert arrow spine specifications from pounds to grains for archery.
Convert gemstone or precious-metal weights for trading.
Pharmaceutical and apothecary compounding unit conversions.
Cross-check historical recipe measurements that use grains.
Academic or laboratory mass unit exercises.

Frequently Asked Questions

Last updated: 2026-06-04 · Reviewed by Nham Vu