Calcometry
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Oz to Grams Converter
Convert ounces to grams (and back) instantly. Useful for cooking, shipping, and nutrition labels.
Ounces
oz
Grams
g
1 oz = 28.3495 g
Convert Ounces
Quick presets
Grams
226.8 g
8 oz = 226.8 g
- 1 oz
- 28.3495 g
- 4 oz
- 113.4 g
- 8 oz
- 226.8 g
- 16 oz
- 453.59 g
- 32 oz
- 907.18 g
- 100 oz
- 2,834.95 g
- 500 oz
- 14,175 g
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Ounces vs grams
Ounces (avoirdupois) are common in US recipes, packaging, and postal weight. Grams are the metric standard worldwide. One avoirdupois ounce equals exactly 28.349523125 grams.
Common questions
Are fluid ounces and weight ounces the same?
No. This tool converts weight ounces (avoirdupois oz). US fluid ounces measure volume (about 29.6 mL each for water-like liquids). A cup of flour and a cup of water weigh different ounces — volume and weight ounces are different units.
My recipe lists 8 oz of chocolate — is that the same as an “8 oz bar”?
Usually yes for US packaging: an “8 oz bar” means 8 weight ounces (about 227 g). Always check whether the recipe means weight or volume — “8 oz of cream cheese” by weight differs from “1 cup” by volume.
How do I convert US nutrition labels (oz) to grams?
Multiply ounces by 28.35 for a close gram estimate. Example: a 5 oz serving → about 142 g. Labels often round; use grams on kitchen scales for baking where precision matters.
Does the USPS use ounces or grams for stamps and parcels?
USPS retail pricing is in pounds and ounces. International forms may ask for kilograms — convert the total package weight before filling customs declarations to avoid rounding errors at the counter.