1 ounce equals 28.349523 grams. Enter a value below to convert instantly.
Ounces to grams converts US recipe and packaging weights into the unit that kitchen scales and nutrition labels use internationally. One avoirdupois ounce is 28.3495 grams — assuming the recipe means weight and not fluid ounces, which is worth checking first.
Need the other direction? Convert gram to ounce →
Multiply the number of ounces by 28.349523125 to get grams.
| Ounces (oz) | Grams (g) |
|---|---|
| 1 | 28.349523 |
| 2 | 56.699046 |
| 3 | 85.048569 |
| 5 | 141.74762 |
| 10 | 283.49523 |
| 20 | 566.99046 |
| 50 | 1,417.4762 |
| 100 | 2,834.9523 |
| 500 | 14,174.762 |
| 1,000 | 28,349.523 |
Serious baking is done by weight because a cup of flour varies with how it was scooped. US recipes give ounces, most scales outside the US read grams, and 4 oz of flour is 113 g — a conversion done at every step of an imported recipe.
US labels give serving sizes in both grams and ounces, with the ounce figure rounded. A 28 g serving is printed as 1 oz even though 1 oz is 28.35 g, so the two numbers on the same label are not exactly equivalent.
US postal rates step at ounce boundaries while international scales read grams. A package at 100 g is 3.53 oz — over the 3 oz step, into the 4 oz band.
Brew ratios are published in grams worldwide, and US bags are sold in ounces. A 12 oz bag is 340 g, which at 18 g per cup is about 19 cups.
Values people actually look up, with the reason each one comes up. Every figure is calculated with the same engine as the converter above.
| Ounce (oz) | Gram (g) | What it is |
|---|---|---|
| 1 | 28.349523 | The base conversion |
| 2 | 56.699046 | A small portion |
| 4 | 113.39809 | A stick of butter |
| 8 | 226.79619 | Half a pound |
| 12 | 340.19428 | A standard coffee bag |
| 16 | 453.59237 | One pound |
| 32 | 907.18474 | Two pounds |
| 35.274 | 1,000.0011 | Exactly one kilogram |
The avoirdupois ounce is 1/16 of a pound, making it exactly 28.349523125 grams. A troy ounce, used only for precious metals, is 31.1035 g — about 10% heavier. A US fluid ounce is not a mass unit at all; it is a volume of about 29.57 mL. A recipe calling for '8 oz of flour' means weight, while '8 oz of milk' in a US recipe almost always means fluid ounces, and the two are not interchangeable because flour is far less dense than water.
Kitchen scales read to 1 g or 0.1 oz, so one decimal place is the practical limit for cooking. Rounding 28.3495 to 28 introduces a 1.2% error, which is invisible in a stew and noticeable in bread or pastry where hydration ratios matter. For anything sold by weight commercially, the applicable legal metrology rules — not a general rounding convention — govern how the figure must be stated.
8 fl oz of water happens to weigh about 8 oz, which is where the confusion comes from — but 8 fl oz of flour weighs about 4.4 oz. The coincidence only holds for water.
Gold and silver are quoted in troy ounces of 31.1035 g. Applying the 28.35 g avoirdupois factor to a bullion weight understates it by about 10%.
For yeast, salt or spices, rounding 7 g to a quarter ounce and back can shift the amount by 10% or more. Weigh small ingredients in grams directly.
Content on this page last reviewed 12 August 2026. Spotted an error? Report it — see also how these values are calculated.
1 oz expressed in every other weight & mass unit on this site.
The ounce (oz) is a Imperial unit of weight & mass.
The gram (g) is a SI unit of weight & mass.
8 oz is 226.8 g — half a pound. US butter is sold in 4 oz sticks of 113.4 g each, which is why European recipes calling for 125 g of butter need slightly more than one stick.
A pound is 16 ounces, or exactly 453.59237 g. Most packaging rounds this to 454 g.
Yes — an ounce is an ounce regardless of the ingredient. What differs is volume: an ounce of flour takes up considerably more space than an ounce of sugar, which is exactly why baking by weight is more reliable than baking by cups.
One ounce equals 28.349523 grams.
Multiply the number of ounces by 28.349523125 to get grams.
One gram equals 0.035273962 ounces.
This conversion is common when tracking body weight, shipping parcels, cooking, and dosing in fitness or nutrition.