How Many Grains in an Ounce?
Quick Answer
There are 437.5 grains in an avoirdupois ounce.
1 oz (avoirdupois) = 437.5 grains
Understanding the Conversion
One avoirdupois ounce equals exactly 437.5 grains (gr). The grain is the smallest unit of the avoirdupois and troy systems, originally based on a grain of wheat. It's still used for bullet weight (a 9mm round is typically 115–147 grains) and gunpowder.
Formula
1 oz (avoirdupois) = 437.5 grains
Common Examples
| Description | Value |
|---|---|
| A 9mm bullet (115 gr) | 0.263 oz = 7.45 g |
| A .308 rifle bullet (168 gr) | 0.384 oz = 10.89 g |
| A paper clip | ≈7 grains = 0.016 oz |
Quick Reference Table
Use this table for quick conversions between ounce and grains:
| ounce | grains |
|---|---|
| 1 | 437.5 |
| 2 | 875 |
| 5 | 2,187.5 |
| 10 | 4,375 |
| 25 | 10,937.5 |
| 50 | 21,875 |
| 100 | 43,750 |
Frequently Asked Questions
How Many Grains in an Ounce?
There are 437.5 grains in an avoirdupois ounce. One avoirdupois ounce equals exactly 437.5 grains (gr). The grain is the smallest unit of the avoirdupois and troy systems, originally based on a grain of wheat. It's still used for bullet weight (a 9mm round is typically 115–147 grains) and gunpowder.
What is the formula to convert ounce to grains?
The formula is: 1 oz (avoirdupois) = 437.5 grains. To convert, multiply the number of ounces by 437.5 to get the equivalent in grains.
How do I convert grains to ounce?
To convert grains to ounce, divide the number of grains by 437.5. For example, 2,187.5 grains equals 5 ounces.