EN
Français
Español
Deutsch
ItalianoOunces to grams: the formula and an example
To convert ounces to grams, multiply by 28.349523125: grams = ounces × 28.3495. Example: an 8 oz steak weighs 8 × 28.3495 = 226.8 g. This is the avoirdupois ounce used for food and body weight in the US and the UK, 16 of which make a pound of 453.59 g.
The converter above opens on ounces to grams. The result updates as you type, to six significant figures. The "Formula:" line shows the factor, the "In every unit" table gives the same weight in kilograms, pounds and stone, and the swap button turns it into grams to ounces.
Ounces to grams chart for the kitchen
| Ounces | Grams | Typical use |
|---|---|---|
| 0.25 | 7.1 | A packet of dry yeast |
| 0.5 | 14.2 | 1 tablespoon of butter |
| 1 | 28.3 | A serving of nuts or cheese |
| 2 | 56.7 | Half a stick of butter |
| 3.5 | 99.2 | A European 100 g chocolate bar |
| 4 | 113.4 | One stick of butter |
| 5 | 141.7 | A can of tuna |
| 8 | 226.8 | A block of cream cheese |
| 12 | 340.2 | A bag of chocolate chips |
| 16 | 453.6 | One pound |
| 24 | 680.4 | A loaf of sandwich bread |
| 32 | 907.2 | Two pounds, a large bag of sugar |
Baking, labels, birth weight: when grams come in handy
Following a recipe written in grams
British, European and many online baking recipes list ingredients in grams, which is more precise than cups. If your scale reads ounces, convert the other way with the swap button: 250 g of butter is 8.82 oz, a little more than two sticks.
Reading nutrition labels
US labels already show both units, such as "1 oz (28g)". Rounding hides the gap on bigger servings: a 12 oz bag holds 340 g, not 336 g as 12 × 28 suggests.
Birth weight
Hospitals abroad record birth weight in grams. Turn pounds and ounces into ounces first: 8 lb 3 oz is 8 × 16 + 3 = 131 oz, and 131 oz is 3,713.79 g, about 3.7 kg.
Ounces versus fluid ounces
An ounce (oz) measures weight; a fluid ounce (fl oz) measures volume, 29.57 ml in the US. A cup of flour is 8 fl oz by volume but only about 4.25 oz by weight. For liquids, choose "Volume" at the top of the tool and pick "US fluid ounce".
Mental math: times 30, minus 5 percent
Multiply by 30 and you land 5.8% too high: 8 oz becomes 240 g instead of 226.8 g. Knock off 5% of that figure and you get 228 g, only 0.5% over. For quick shopping math, "28 grams to the ounce" is close enough.
Frequently asked questions
How many grams are in an ounce?
Exactly 28.349523125 g, usually rounded to 28.35 g. A pound is 453.59237 g.
How many ounces are in 100 grams?
3.5274 oz. That is why a 100 g chocolate bar is labeled 3.5 oz.
Is a troy ounce the same as an ounce?
No. Gold and silver are weighed in troy ounces of 31.1035 g, about 10% heavier. The converter uses the regular avoirdupois ounce.