Grain to Ounce

A Grain to Ounce Converter is a specialized tool that helps convert weight from grains (gr) to ounces (oz). Both grains and ounces are part of the imperial and U.S. customary systems, though grains are typically used for measuring extremely small weights, especially in pharmacology, ammunition, and jewelry, while ounces are used for general weight measurement.

The conversion formula is:

1 grain = 0.00228571 ounces

To convert grains to ounces, multiply the number of grains by 0.00228571.

Common Uses for Grain to Ounce Conversion:

• Pharmaceuticals: Dosing medications in exact weights.
• Ballistics & Ammunition: Measuring bullet and powder weights.
• Jewelry Making: Weighing small quantities of precious metals or gems.
• Nutritional Supplements: Measuring active ingredients in small quantities.
• Laboratory Testing: Converting precision samples into standardized weights.

Key Features of Grain to Ounce Converter:

• High Accuracy: Converts even the smallest units of mass correctly.
• Fast Results: Instant conversion to support quick decision-making.
• User-Friendly: Designed for ease of use across different industries.
• Reliable & Precise: Minimizes human error in delicate weight measurements.
• Multi-Use Tool: Useful for pharmacists, reloaders, chemists, and jewelers.
• Cross-Device Compatibility: Works smoothly on all devices—desktop or mobile.



The Grain to Ounce Converter is essential for converting microscopic weights to standard ounces, enabling clarity and consistency in sensitive fields.

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



Select the Unit You Want to Convert From (Grains)

Choose Grains (gr) as your input unit.

Select the Unit You Want to Convert To (Ounces)

Choose Ounces (oz) as the target unit.

Enter the Amount

Input the number of grains (e.g., "250 gr").

Get Instant Results

The converter will display the equivalent weight in ounces.

Apply the Results

Useful for reloading, compounding medicines, lab analysis, or making jewellery.

Here’s how to convert Grains to Ounces:

1 grain = 0.00228571 ounces

Example 1: Converting 100 grains to ounces

100 × 0.00228571 = 0.228571 oz

Example 2: Converting 437.5 grains to ounces

437.5 × 0.00228571 ≈ 1 ounce (since 437.5 grains = 1 oz exactly)

To convert grains to ounces, multiply the grain value by 0.00228571.

Grain to Ounce Converter Reference Table

From Unit

To Unit

Conversion Value

Example Calculation

1 gr

Ounces

0.00228571 oz

1 × 0.00228571 = 0.00228571 oz

100 gr

Ounces

0.228571 oz

100 × 0.00228571 = 0.228571 oz

250 gr

Ounces

0.571428 oz

250 × 0.00228571 = 0.571428 oz

437.5 gr

Ounces

1 oz

437.5 × 0.00228571 ≈ 1 oz

500 gr

Ounces

1.14286 oz

500 × 0.00228571 = 1.14286 oz

Steps to Convert Grains to Ounces:

• Multiply the number of grains by 0.00228571

Formula:

Ounces = Grains × 0.00228571