Ounce to Grain

An Ounce to Grain Converter is a precise digital tool that helps you convert weight from ounces (oz) to grains (gr). Both are units in the imperial and U.S. customary systems, with ounces used for general weight measurement and grains used in specialized fields like pharmacy, ammunition reloading, jewelry, and laboratory science. Since grains are extremely small units, converting ounces to grains is helpful when high precision is required.

The conversion formula is:

1 ounce = 437.5 grains

To convert ounces to grains, multiply the number of ounces by 437.5.

Common Uses for Ounce to Grain Conversion:

• Pharmaceuticals: Preparing medicines where precision dosing is crucial.
• Ammunition Reloading: Calculating powder charges or bullet weights.
• Jewelry Weighing: Converting weights of gold, silver, or gemstones.
• Scientific Research: Measuring chemical samples in highly sensitive experiments.
• Food Supplements: Determining exact micro-ingredient portions.

Key Features of Ounce to Grain Converter:

• High Accuracy: Converts weights from ounces to grains with full precision.
• Instant Results: Outputs real-time conversions for quick calculations.
• User-Friendly Interface: Simple to operate for both professionals and beginners.
• Error-Free: Avoids mistakes in sensitive measurement tasks.
• Widely Applicable: Beneficial for pharmacists, reloaders, lab techs, and jewelers.
• Mobile Responsive: Works efficiently on desktops, tablets, and smartphones.

The Ounce to Grain Converter is an essential utility when small-scale precision is needed for scientific, technical, or commercial applications.

Here’s how to use the Ounce to Grain Converter:



Select the Unit You Want to Convert From (Ounces)

Choose Ounces (oz) as the base unit.

Select the Unit You Want to Convert To (Grains)

Choose Grains (gr) as the output unit.

Enter the Amount

Input the number of ounces you want to convert (e.g., "2.5 oz").

Get Instant Results

The tool instantly displays the equivalent weight in grains.

Apply in Real-World Use

Use the result in reloading, research labs, gold weighing, or supplement formulation

Here’s how to convert Ounces to Grains:

1 ounce = 437.5 grains

Example 1: Converting 2 ounces to grains

2 × 437.5 = 875 grains

Example 2: Converting 3.5 ounces to grains

3.5 × 437.5 = 1,531.25 grains

To convert ounces to grains, multiply the ounce value by 437.5.

Ounce to Grain Converter Reference Table

From Unit

To Unit

Conversion Value

Example Calculation

1 oz

Grains

437.5 gr

1 × 437.5 = 437.5 gr

2 oz

Grains

875 gr

2 × 437.5 = 875 gr

3 oz

Grains

1,312.5 gr

3 × 437.5 = 1,312.5 gr

4 oz

Grains

1,750 gr

4 × 437.5 = 1,750 gr

5 oz

Grains

2,187.5 gr

5 × 437.5 = 2,187.5 gr

Steps to Convert Ounces to Grains:

• Multiply the number of ounces by 437.5

Formula:



Grains = Ounces × 437.5