Convert grains to ounces

1 gr=0.002286oz

Use the converter below to change any grains value into ounces instantly — with formula, conversion table, and real-world examples.

You have

Equals

0.0022857

Conversion formula

Forward

ounces = grains × 0.002286

Reverse

grains = ounces × 437.5

Example: 10 gr × 0.002286 = 0.02286 oz.

About both units

From

Grain

The grain equals 64.79891 milligrams exactly, one of the oldest units of mass. Originally defined as the weight of a single grain of barley. Today used almost exclusively in firearms (bullet and gunpowder weights) and pharmaceuticals.

Real-world: A 9 mm bullet typically weighs 115–124 grains (7.45–8.03 g). Aspirin grain dosing: "5 grain aspirin" = 325 mg.

Read full grain reference →

Ounce

The ounce equals 28.35 grams and is 1/16 of a pound. It is common in American and British cooking for small ingredient weights. The fluid ounce (29.57 ml in the US, 28.41 ml in the UK) is a volume unit and is completely different from the mass ounce.

Real-world: A US tin of tuna is 5 oz (142 g). A Starbucks grande coffee is 16 fl oz (473 ml). Gold is traded in troy ounces (31.10 g).

Read full ounce reference →

Grain to Ounce conversion table

Common grains to ounces values for quick reference.

Grain (gr)	Ounce (oz)
1 gr	0.002286 oz
5 gr	0.01143 oz
10 gr	0.02286 oz
25 gr	0.05714 oz
50 gr	0.1143 oz
100 gr	0.2286 oz
250 gr	0.5714 oz
500 gr	1.14286 oz
1,000 gr	2.28571 oz
5,000 gr	11.4286 oz

Tips & common mistakes

Quick tips

1 grain = 64.79891 mg exactly. 7000 grains = 1 pound.
Ballistics is one of the few modern contexts where grains are essential.
Some older pharmacology dosing survives in grain units — 5 gr ≈ 325 mg.

Avoid these

Confusing the grain (mass) with the troy grain in older precious-metal contexts — they are identical (64.8 mg).
Assuming "grain" refers to an amount of cereal — in firearms it is always a weight.
Reading "5 gr" as 5 grams — it is 5 grains (324 mg).

Frequently asked questions

How many ounces in a grain?

One grain equals 0.002286 ounces.

How do I convert grains to ounces?

Multiply the grain value by 0.002286 to get the equivalent in ounces.

What is 100 grains in ounces?

100 grains equals 0.2286 ounces.

Is a grain bigger than a ounce?

No. 1 grain equals 0.002286 ounces, so one grain is smaller.

How to convert grains to ounces without a calculator?

Multiply by 0 for a quick estimate; use a calculator for precise results.

Related weight conversions

📊 See full comparison matrix →

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