Ounces to GramsFree online conversion calculator — instant results, no sign-up
Convert ounces to grams and back.
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About the Ounces to Grams
The Ounces to Grams calculator converts ordinary avoirdupois ounces to grams and shows the reverse grams-to-ounces relationship. Its default input is 1 ounce, which displays as 28.349523 grams. This tool is for mass conversions, not fluid ounces or troy ounces.
- Value in ounces (ounces)
- Enter the mass in avoirdupois ounces to convert to grams; the default value is 1 ounce.
Formula and method
g = o × 28.349523125; o = g ÷ 28.349523125. Rounded to six decimal places: 1 ounce = 28.349523 grams; 1 gram = 0.035274 ounces.
- oMass in avoirdupois ounces.
- gMass in grams.
Multiply the entered ounce value by the exact avoirdupois conversion factor, 28.349523125 grams per ounce. For the reverse relationship, divide a gram value by that factor. With the default input of 1 ounce, the gram result is displayed to six decimal places as 28.349523; the reverse unit relationship is displayed as 1 gram = 0.035274 ounces.
Worked example
These are the calculator's starting values and the results it actually produces for them.
Inputs
- Value in ounces1 ounces
Results
- grams28.349523
- 1 ounces =28.349523 grams
- 1 grams =0.035274 ounces
How to use the Ounces to Grams
- 1Enter the mass in the Value in ounces (ounces) field, or leave the default of 1.
- 2Confirm that your measurement uses ordinary weight ounces, not fluid ounces or troy ounces.
- 3Read the grams result calculated from the entered ounce value.
- 4Check the forward conversion row: with the default input, 1 ounce equals 28.349523 grams.
- 5Read the reverse unit row, 1 gram equals 0.035274 ounces, when you need the grams-to-ounces relationship.
Reading your result
The “grams = 28.349523” result is the converted mass for the default input of 1 ounce. The row “1 ounces = = 28.349523 grams” repeats that forward conversion. The row “1 grams = = 0.035274 ounces” gives the reverse unit relationship, not a conversion of the preceding 28.349523-gram result back to ounces. The duplicated equals signs in these row labels do not change their mathematical meaning.
Limitations
The calculator assumes international avoirdupois ounces, with exactly 28.349523125 grams per ounce. Displayed results are rounded to six decimal places, so converting a rounded result back may introduce a small rounding difference. It does not convert fluid ounces, which measure volume, or troy ounces, which use a different mass definition. Conversion does not improve the accuracy of the original measurement.
Common questions
Why does 1 ounce display as 28.349523 grams?+
An avoirdupois ounce is exactly 28.349523125 grams. Rounding that value to six decimal places gives the displayed result of 28.349523 grams.
How do I convert grams back to ounces?+
Divide the gram amount by 28.349523125. The reverse unit row shows this for 1 gram, which rounds to 0.035274 ounces; the listed input field itself accepts ounces.
Can I enter fluid ounces from a liquid measuring cup?+
No. Fluid ounces measure volume, while this calculator converts mass. Converting a liquid volume to grams requires its density and the applicable fluid-ounce definition.
Does this calculator work for troy ounces of precious metals?+
No. It uses avoirdupois ounces, not troy ounces. Use a conversion specifically based on troy ounces for a mass quoted in that unit.
Does the calculator save my information?+
Calculations run in your browser. While signed in, inputs and results are automatically recorded in account history; saving a result creates a separate saved record.
Further reading
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Results are estimates for informational purposes and are not financial, medical or legal advice.