Free · Volume and weight converters ⚖️
Grams & Avoirdupois Ounces with Exact Factor
Convert grams and ordinary ounces using the exact international-pound definition, with reverse entry.
- Formula & worked example
- Private in your browser
- No signup
Calculator inputs
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How to use this calculator
- Enter the known values in the units shown. Results update as you type.
- Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
- Use the worked example to check the method. Reset restores the starting fields.
Private by default
Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.
Formula and method
28.349523125 grams equal one avoirdupois ounce exactly; 453.59237 grams equal 16 ounces.
Ounces = grams ÷ 28.349523125; grams = ounces × 28.349523125
Worked example
Enter these known values and leave the other values blank.
- Mass in grams
- 28.349523125
- Mass in ordinary ounces
- 1
Assumptions and limitations
- Ounce means avoirdupois mass, not troy ounce or fluid ounce.
- One international pound is exactly 0.45359237 kilogram and contains 16 ordinary ounces.
- Zero and signed mass differences are accepted. Display rounding does not replace the exact conversion factor.
Common questions
Is the conversion factor 28.35?
28.35 is a rounded approximation. This calculation uses the exact value 28.349523125 grams per ordinary ounce.
Can I use this for troy ounces?
No. Troy ounces use 31.1034768 grams. Use the converter with an explicit troy-unit selector.
References
Bookify replaces the rounded ounce factor with exactly 28.349523125 grams in both conversion directions.
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