What is the difference between avoirdupois and troy ounces?

The avoirdupois ounce is defined as exactly 28.349523125 grams and is used for general purposes, while the troy ounce is 31.1034768 grams, used mainly for precious metals. This tool uses the avoirdupois ounce for conversion.

Why is grain used for small mass measurements?

Grain is defined as 1/7000 of an avoirdupois pound and equals exactly 64.79891 milligrams, making it suitable for very small mass measures like bullets, arrows, or pharmaceutical dosages.

Can this conversion be used for large weight calculations?

No, grain units are best for small masses; for larger weights, other units are more practical and accurate.

How to Convert from Ounce [oz] to Grain [gr]?

Learn how to convert weight measurements from ounce (oz) to grain (gr) with this easy-to-use online converter tool, ideal for ballistics, archery, and apothecary uses.

Ounce [oz]

Grain [gr]

Please check your input. It must be a valid numeric value.

Ounce [oz] to Grain [gr] Conversion Table

Ounce [oz]	Grain [gr]

Custom Unit Conversion Table Generator – Instant Printable Conversion Tables

Start Value

Enter the starting number (positive decimal or integer ≥ 0). Example: 0.1, 1, 5.

End Value

Enter the ending number (positive decimal or integer > Start Value). Example: 10, 50, 100.

Interval

Enter the step size (positive decimal > 0 and < End Value – Start Value). Example: 1.0, 2.5.

Ounce [oz] to Grain [gr] Conversion Table
Ounce [oz]	Grain [gr]

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What Is This Tool?

This tool converts weight units from ounce (oz) to grain (gr), enabling users to measure very small masses with precision. It is useful in fields such as ballistics, archery, and pharmaceutical dosage determinations.

How to Use This Tool?

Enter the weight value in ounces (oz) you want to convert.
Select ounce as the input unit and grain as the output unit.
Click the convert button to view the equivalent weight in grains (gr).

Key Features

Converts avoirdupois ounce units to grains accurately.
Supports measurements relevant to ballistics, archery, and apothecary contexts.
Easy to use with clear input and output format.
Browser-based and accessible without installation.

Examples

2 Ounce [oz] equals 875 Grain [gr].
0.5 Ounce [oz] converts to 218.75 Grain [gr].

Common Use Cases

Measuring bullet and propellant weights in firearms.
Determining total arrow weight in archery expressed in grains.
Specifying precise pharmaceutical or apothecary dosages.

Tips & Best Practices

Ensure you are converting from the avoirdupois ounce variant for accuracy.
Use grain units for very small mass measurements only.
Avoid rounding the conversion factor prematurely to maintain precision.

Limitations

The ounce unit varies; this tool uses the avoirdupois ounce for conversion.
The grain unit is not suitable for measuring large weights.
Precision errors can occur if the conversion rate is rounded or truncated.

Frequently Asked Questions

What is the difference between avoirdupois and troy ounces?: The avoirdupois ounce is defined as exactly 28.349523125 grams and is used for general purposes, while the troy ounce is 31.1034768 grams, used mainly for precious metals. This tool uses the avoirdupois ounce for conversion.
Why is grain used for small mass measurements?: Grain is defined as 1/7000 of an avoirdupois pound and equals exactly 64.79891 milligrams, making it suitable for very small mass measures like bullets, arrows, or pharmaceutical dosages.
Can this conversion be used for large weight calculations?: No, grain units are best for small masses; for larger weights, other units are more practical and accurate.

Key Terminology

Ounce (oz): A unit of mass in customary systems; the avoirdupois ounce equals exactly 28.349523125 grams.
Grain (gr): A traditional unit of mass equal to exactly 64.79891 milligrams, used for very small masses.
Avoirdupois ounce: A type of ounce used for general weight measurements and defined precisely in grams.

Quick Knowledge Check

Which ounce variant is used in this conversion tool?

Troy ounce

Avoirdupois ounce

Metric ounce

What is one grain equal to?

64.79891 milligrams

28.349523125 grams

437.5 grains

In which field is grain commonly used as a unit of mass?

Ballistics

Automotive industry

Textile manufacturing

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