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Grain (gr) - Unit Information & Conversion

Symbol:gr
Plural:grains
Category:Weight

What is a Grain?

Definition

The grain (gr) is a unit of mass in the traditional English weight systems (Avoirdupois, Troy, and Apothecaries'). It was originally based on the weight of a single grain of barley. It is defined as exactly 64.79891 milligrams (or 1/7000 of an avoirdupois pound).

History

The grain is one of the oldest units of mass, dating back to antiquity, using seeds (like barley or wheat) as weight standards. It formed the legal basis for English weight systems and remains defined in terms of metric units today.

Common Uses

  • Ammunition: Measuring the mass of bullets and gunpowder charges.
  • Archery: Measuring the mass of arrows and arrowheads.
  • Medicine & Pharmacy: Historically used in the apothecaries' system; sometimes still used for measuring dosage of certain older medications (e.g., aspirin).
  • Jewelry: Used in the troy system (24 grains = 1 pennyweight).
  • Reloading: Handloading ammunition requires precise measurement in grains.

Unit FAQs

How many grains are in an ounce (avoirdupois)?

There are 437.5 grains (gr) in 1 avoirdupois ounce (oz).

How many grains are in a pound (avoirdupois)?

There are 7,000 grains (gr) in 1 avoirdupois pound (lb).

How many milligrams are in a grain?

There are exactly 64.79891 milligrams (mg) in 1 grain (gr).

Grain Conversion Formulas

To Kilogram:

1 gr = 0.000065 kg
Example: 5 grains = 0.000324 kilograms

To Gram:

1 gr = 0.064799 g
Example: 5 grains = 0.323995 grams

To Milligram:

1 gr = 64.79891 mg
Example: 5 grains = 323.99455 milligrams

To Pound:

1 gr = 0.000143 lb
Example: 5 grains = 0.000714 pounds

To Ounce:

1 gr = 0.002286 oz
Example: 5 grains = 0.011429 ounces

To Stone:

1 gr = 0.00001 st
Example: 5 grains = 0.000051 stones

To Ton (metric):

1 gr = 6.4799e-8 t
Example: 5 grains = 3.2399e-7 tons

To Ton (US):

1 gr = 7.1429e-8 ton
Example: 5 grains = 3.5714e-7 US tons

To Ton (UK):

1 gr = 6.3776e-8 long ton
Example: 5 grains = 3.1888e-7 long tons

To Microgram:

1 gr = 64798.91 µg
Example: 5 grains = 323994.55 micrograms

To Carat:

1 gr = 0.323995 ct
Example: 5 grains = 1.619973 carats

To Slug:

1 gr = 0.000004 sl
Example: 5 grains = 0.000022 slugs

To Troy Ounce:

1 gr = 0.002083 oz t
Example: 5 grains = 0.010417 troy ounces

To Pennyweight:

1 gr = 0.041667 dwt
Example: 5 grains = 0.208333 pennyweights

To Dram:

1 gr = 0.036571 dr
Example: 5 grains = 0.182857 drams

To Quintal:

1 gr = 6.4799e-7 q
Example: 5 grains = 0.000003 quintals

To Atomic Mass Unit:

1 gr = 3.902281572494261e+22 u
Example: 5 grains = 1.95114078624713e+23 atomic mass units

To Pavan (India):

1 gr = 0.0081 pavan
Example: 5 grains = 0.040499 pavan

To Kati (India):

1 gr = 0.005555 kati
Example: 5 grains = 0.027777 kati

To Masha (India):

1 gr = 0.071098 masha
Example: 5 grains = 0.355491 masha

To Dina (India):

1 gr = 1000 dina
Example: 5 grains = 5000 dina

To Pras (India):

1 gr = 23223.750986 pras
Example: 5 grains = 116118.754928 pras

To Lota (India):

1 gr = 37172389857.7329 lota
Example: 5 grains = 185861949288.6645 lota

Convert Grain

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Grain Quick Info

gr
Symbol:gr
Category:Weight
System:Various
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