Direct conversion
Convert ounce [oz] to grain [gr] instantly with formula, examples, chart, and FAQs.
Quick answer
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1 ounce [oz] = 437.5 grain [gr]
1 ounce [oz] = 437.5 grain [gr]
Example: 1 ounce [oz] equals 437.5 grain [gr].
Weight and mass conversions use kilogram as the reference unit. Common factors include 1 pound = 0.45359237 kilogram and 1 ounce = 0.028349523125 kilogram.
Displayed results are rounded for readability. The calculator keeps enough precision for everyday use and switches to scientific notation for very large or very small values. Last reviewed: 2026-05-21.
The ounce is an avoirdupois mass unit equal to 28.349523125 grams.
HistoryThe avoirdupois ounce became the standard ounce for general weight measurement.
Current useOunces are used for food packages, recipes, postal weights, consumer goods, and small shipments.
The grain (gr) is a weight unit used to express measurements in this converter.
HistoryThis unit is included because it appears in practical measurement systems, technical references, product specifications, or everyday conversion needs.
Current useUse grain when comparing weight values, checking specifications, converting between systems, or preparing quick estimates.
| ounce [oz] | grain [gr] |
|---|---|
| 1 | 437.5 |
| 2 | 875 |
| 5 | 2187.5 |
| 10 | 4375 |
| 20 | 8750 |
| 25 | 10937.5 |
| 50 | 21875 |
| 100 | 43750 |
| 1000 | 437500 |
Use this formula: 1 ounce [oz] = 437.5 grain [gr] Enter your value in the calculator and the result updates instantly.
1 ounce [oz] equals 437.5 grain [gr].
Yes. Use the swap button in the calculator or open the related reverse conversion link when it is listed on this page.