How to convert grams to ounces
One ounce equals 28.349523125 grams exactly. That oddly precise figure is the internationally agreed definition of the avoirdupois ounce — the one the United States and the United Kingdom use to weigh food, letters, and almost everything else. For everyday work, 28.35 g is close enough. The conversion runs both ways:
- Grams to ounces: divide by 28.3495 →
ounces = grams ÷ 28.3495 - Ounces to grams: multiply by 28.3495 →
grams = ounces × 28.3495
The converter above works in either direction: type into the grams field or the ounces field and the other updates instantly. It also shows the weight in pounds and in troy ounces, plus a quick reference table for the values cooks look up most.
Worked example
A recipe calls for 8 oz of butter, but your kitchen scale reads grams. Multiply: 8 × 28.3495 = 226.8 g. Going the other way, if you weigh 250 g of sugar and want to know the ounces: 250 ÷ 28.3495 = 8.82 oz. And the classic case, 100 g of flour, is 100 ÷ 28.3495 = 3.53 oz. With those three numbers you can follow almost any recipe from either side of the metric line.
Conversion table
| Grams | Ounces |
|---|---|
| 10 g | 0.35 oz |
| 25 g | 0.88 oz |
| 50 g | 1.76 oz |
| 100 g | 3.53 oz |
| 250 g | 8.82 oz |
| 500 g | 17.64 oz |
| 1000 g | 35.27 oz |
Where it comes up: cooking and mail
In the kitchen, American and British recipes tend to measure dry ingredients in ounces and portions in pounds, while much of the world weighs everything in grams. Converting keeps a cake from failing because you doubled the butter. A useful mental shortcut: 1 oz is nearly 28 g, so you can multiply a handful of ounces by 28 for a fast rough estimate.
The other big use is postage and shipping. Many postal services and online stores price packages by ounces and pounds. Knowing that a 50 g envelope weighs 1.76 oz, or that a 500 g parcel is 17.64 oz, lets you estimate the cost before you reach the counter.
Avoirdupois ounce vs troy ounce
There are two different “ounces,” and mixing them up gets expensive. The avoirdupois ounce (28.3495 g) is the one used for food, mail, and body weight. The troy ounce (31.1035 g) is used only for precious metals such as gold, silver, and platinum, and it is about 10% heavier. That is why the price of gold is always quoted “per troy ounce.” The converter shows both so you never confuse them: if you are weighing a gold coin, read the troy line, not the avoirdupois one.
Frequently asked questions
How many grams are in an ounce?
An avoirdupois ounce holds 28.349523125 grams, rounded in practice to 28.35 g. That is the standard ounce for food, letters, and general weight.
Is the kitchen ounce the same as the gold troy ounce?
No. The kitchen (avoirdupois) ounce weighs 28.35 g; the troy ounce used for gold weighs 31.10 g, almost 10% more. Using the wrong ounce when valuing precious metals leads to a meaningful difference in money.
How many ounces are in half a pound?
Half a pound is 8 ounces, because a full pound holds 16 ounces. In grams, half a pound is 226.8 g and a whole pound is 453.6 g.
Is 1 oz = 28 g accurate enough?
It is a handy approximation, but the exact value is 28.3495 g. Rounding to 28 g introduces an error above 1% — enough to notice when weighing large amounts or shipping by weight.