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How to Convert an Ounce to a Grain

The grain is an old English weight that was originally defined as the weight of a barleycorn. Two types of ounces exist: the avoirdupois ounce, abbreviated oz. or oz. av., and the troy ounce, abbreviated toz. or oz. ap. Since all these units measure weight, you can convert directly between the different units. In order to do so, you need to know whether you are converting from troy ounces or avoirdupois ounces.

Calculator

Instructions

- 1
  Divide the number of avoirdupois ounces by 0.002285714 to convert to grains. For example, if you have 82 av. oz., divide 82 by 0.002285714 to get 35,875 gr.
- 2
  Multiply the number of avoirdupois ounces by 437.5 to convert to grains. For example, if you have 82 oz. av., multiply 82 by 437.5 to confirm your answer of 35,875 gr.
- 3
  Multiply the number of troy ounces by 480 to convert to grains. For example, if you have 12 toz., multiply 12 by 480 to get 5,760 gr.
- 4
  Divide the number of troy ounces by 0.00208333 to convert to grains. In this example, verify your answer by dividing 12 by 0.00208333 to get 5,760 gr.

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