Grain to Ounce Converter
Weight · unit-converter
Convert Grain to Ounce with a fixed input and output unit, step-by-step formula line, and reference tables. All calculations use gram-based factors (international avoirdupois pound and metric definitions). The full Weight Converter also includes carat, grain, and US/UK hundredweight.
Calculator
From: Grain (gr)
To: Ounce (oz)
About Grain
The grain is 1/7000 of a pound (exactly 64.79891 mg). It is used in ballistics, pharmacy, and precious-metal contexts.
About Ounce
The avoirdupois ounce is 1/16 of an avoirdupois pound (about 28.35 g). Cooking and postal weights often use ounces.
How to convert grains to ounces
1 grain is equal to 0.00228571428571 ounce:
1 gr = (0.06479891 g ÷ 28.349523125 g) oz = 0.00228571428571 oz
Each grain is defined as 0.06479891 g and each ounce as 28.349523125 g, so one gr equals 0.06479891 ÷ 28.349523125 oz = 0.00228571428571 oz.
Let w(gr) be the numeric value of the same mass measured in Grain (gr), and w(oz) the value in Ounce (oz). Then:
w(oz) = w(gr) × (0.06479891 / 28.349523125)
Equivalently, divide by how many gr fit into one oz (grams per oz divided by grams per gr):
w(oz) = w(gr) ÷ 437.5
Or: ounce = grain ÷ 437.5
Examples
Example #1: Convert 20 gr to ounce
20 gr = 20 gr × (0.06479891/28.349523125) oz = 0.0457142857 oz
20 gr = 20 gr ÷ 437.5 = 0.0457142857 oz
Example #2: Convert 50 gr to ounce
50 gr = 50 gr × (0.06479891/28.349523125) oz = 0.1142857143 oz
50 gr = 50 gr ÷ 437.5 = 0.1142857143 oz
Summary
To convert Grain to Ounce, multiply the value in gr by the ratio of grams per gr divided by grams per oz. Equivalently: value_oz = value_gr × (0.06479891 / 28.349523125). Numerically, 1 gr equals 0.002285714285714286 oz.
Relationship context
Both units belong to imperial / UK (stone, long ton, pound, ounce). Relationships such as 16 oz per lb and 14 lb per stone are exact in the avoirdupois system; tons use fixed pound counts. This tool uses international definitions tied to the kilogram.
Conversion tables
| Grain (gr) | Ounce (oz) |
|---|---|
| 0.1 | 0.0002285714 |
| 1 | 0.0022857143 |
| 2 | 0.0045714286 |
| 3 | 0.0068571429 |
| 4 | 0.0091428571 |
| 5 | 0.0114285714 |
| 6 | 0.0137142857 |
| 7 | 0.016 |
| 8 | 0.0182857143 |
| 9 | 0.0205714286 |
| Grain (gr) | Ounce (oz) |
|---|---|
| 10 | 0.0228571429 |
| 20 | 0.0457142857 |
| 30 | 0.0685714286 |
| 40 | 0.0914285714 |
| 50 | 0.1142857143 |
| 60 | 0.1371428571 |
| 70 | 0.16 |
| 80 | 0.1828571429 |
| 90 | 0.2057142857 |
| 100 | 0.2285714286 |