Ounces to Grains (oz to gr) Converter

How to convert ounces to grains

Formulagr = oz × 437.5

Multiply the value in ounces by 437.5. To go the other way, multiply by 0.002285714286 (or divide by 437.5).

An ounce is larger than a grain: one ounce contains 437.5 grains.

Worked examples

1 ounce1 oz × 437.5 = 437.5 gr
5 ounces5 oz × 437.5 = 2,187.5 gr
10 ounces10 oz × 437.5 = 4,375 gr
20 ounces20 oz × 437.5 = 8,750 gr
100 ounces100 oz × 437.5 = 43,750 gr

Ounces to grains conversion table

Values are calculated by the conversion engine and rounded to 8 significant figures.

Ounces to grains: 0.1–10 oz
Ounces (oz)	Grains (gr)
0.1 oz	43.75 gr
0.25 oz	109.375 gr
0.5 oz	218.75 gr
1 oz	437.5 gr
2 oz	875 gr
3 oz	1,312.5 gr
4 oz	1,750 gr
5 oz	2,187.5 gr
6 oz	2,625 gr
7 oz	3,062.5 gr
8 oz	3,500 gr
9 oz	3,937.5 gr
10 oz	4,375 gr

Ounces to grains: 12–1,000 oz
Ounces (oz)	Grains (gr)
12 oz	5,250 gr
15 oz	6,562.5 gr
20 oz	8,750 gr
25 oz	10,937.5 gr
30 oz	13,125 gr
40 oz	17,500 gr
50 oz	21,875 gr
75 oz	32,812.5 gr
100 oz	43,750 gr
250 oz	109,375 gr
500 oz	218,750 gr
1,000 oz	437,500 gr

About the units

Ounce (oz)

One sixteenth of a pound: exactly 28.349523125 g. Not to be confused with the fluid ounce (volume) or the troy ounce used for precious metals. One ounce equals 0.02834952313 kilograms (kg).

Grain (gr)

Exactly 64.79891 mg; 7,000 grains make a pound. Used for bullets, arrows and some medicines. One grain equals 0.00006479891 kilograms (kg).

Frequently asked questions

How many grains are in one ounce?

There are 437.5 grains in one ounce, and this value is exact by definition.

How do I convert ounces to grains?

Multiply the number of ounces by 437.5. For example, 10 oz × 437.5 = 4,375 gr.

How many ounces are in one grain?

One grain equals 0.002285714286 ounces. That is the reverse factor, 1 ÷ 437.5.

What is 10 ounces in grains?

10 oz = 4,375 gr.

Is this oz to gr converter accurate?

Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.

Ounces to Grains Converter