Convert Grams to Ounces
Convert grams into avoirdupois ounces for US recipes, jewelry weights, postal rates and packaging weights.
1 g = 0.035274 oz
One gram equals approximately 0.035274 ounces, since an avoirdupois ounce is exactly 28.349523125 g. To convert grams to ounces, divide by 28.3495 — so 100 g = 3.53 oz and 500 g = 17.64 oz. This is the everyday ounce used for food and post, not the heavier troy ounce used for precious metals. Cooking is the usual context, and the distinction that matters there is weight versus volume: a fluid ounce measures space, not mass, and the two coincide only for water. Eight fluid ounces of flour weighs about 4.25 oz, so substituting one for the other roughly doubles the flour in a recipe. Handy anchors: a stick of American butter is 4 oz or 113 g, and a standard tin is 400 g or 14.1 oz. The troy ounce, at 31.10 g, appears only in bullion pricing.
Quick reference: grams to ounces
| Grams | Ounces |
|---|---|
| 10 | 0.353 oz |
| 25 | 0.882 oz |
| 28.35 | 1 oz (exact) |
| 50 | 1.764 oz |
| 100 | 3.527 oz |
| 250 | 8.818 oz |
| 454 | 16.01 oz (≈1 lb) |
| 500 | 17.637 oz |
| 1000 | 35.274 oz |
How do you convert grams to ounces?
Formula: ounces = grams ÷ 28.3495 • A 100 g European chocolate bar → 100 ÷ 28.3495 = 3.53 oz, against the 3.5 oz commonly printed on the US label. • A 250 g pack of butter → 250 ÷ 28.3495 = 8.82 oz, slightly more than the 8 oz two-stick US pack. • A 500 g bag of pasta → 500 ÷ 28.3495 = 17.64 oz, just over the 16 oz one-pound US bag.
When and why people use grams to ounces
Cooking from international recipes is the dominant use. European, Australian and Asian recipes give dry ingredients in grams, while US kitchen scales and packaging use ounces. The conversion matters most in baking, where ratios rather than volumes determine the result and a 10% error in flour changes the texture noticeably. Nutrition labelling is the second. Regulations in most countries require metric quantities, so a serving size given as 30 g needs converting to compare against a US label quoting 1 oz — which is 28.35 g, close but not identical, meaning per-serving figures are not directly comparable. Postage is a third: many carriers price by weight bands, and a package weighed on a metric scale needs converting to check which US band it falls into. Because band boundaries are hard cutoffs, a gram either side of the line changes the price.
Common mistakes to watch for when converting grams to ounces
Confusing weight ounces with fluid ounces is the most common error. A fluid ounce measures volume, roughly 29.57 ml, and only coincides with 28.35 g for water — for flour, oil or honey the two diverge substantially, and a recipe calling for 8 fl oz of milk is not asking for 8 oz on a scale. The second trap is the troy ounce at 31.1035 g, about 10% heavier, used only for gold and silver; a gram-to-ounce conversion of a precious metal weight using the avoirdupois factor will be wrong. Third, packaging routinely rounds — a 100 g bar labelled 3.5 oz is really 3.53 oz — so converted figures will not always match the printed ones. Finally, ounces are a coarse unit: a 1 oz resolution is 28 g, so for anything needing precision, work in grams.
How to estimate grams to ounces in your head
Divide by 30 and then add about 6%. For 300 g: 300 ÷ 30 = 10, plus 0.6 gives 10.6 oz against a true 10.58. An easier route for kitchen work is to memorise a handful of anchors and interpolate: 30 g ≈ 1 oz, 100 g ≈ 3.5 oz, 225 g ≈ 8 oz, 450 g ≈ 16 oz (1 lb). These four cover almost every quantity a recipe uses, and the 225 g and 450 g figures are why so many packaged goods come in those odd-looking metric weights — they are rounded imperial sizes. The honest caveat is that ounces are a coarse unit for cooking. If a recipe's success depends on the ratio between ingredients, estimating in ounces introduces more error than the conversion itself. Weigh in grams and skip the conversion entirely where you can.
Grams to Ounces FAQ
How many ounces is 100 g?
- 3.527 oz. Packaging often rounds this to 3.5 oz.
Is an ounce of weight the same as a fluid ounce?
- No. A fluid ounce measures volume (about 29.57 ml) and only matches 28.35 g for water. For flour or oil the two are quite different.
What is a troy ounce?
- 31.1035 g, used only for precious metals. It is about 10% heavier than the everyday avoirdupois ounce.
How many grams in an ounce?
- 28.349523125 g exactly, normally rounded to 28.35 g.
Why doesn't my converted figure match the label?
- Manufacturers round. A 100 g bar is 3.53 oz but is usually printed as 3.5 oz.
How many ounces is 500 g?
- 17.64 oz, slightly more than the 16 oz in a US pound.
Should I bake in grams or ounces?
- Grams. A kitchen scale resolves to 1 g, whereas an ounce is a 28 g step — far too coarse for accurate baking ratios.
How many ounces is a kilogram?
- 35.274 oz, which is 2 lb 3.3 oz. The pound-and-ounce form is usually more useful for anything above about 500 g.
Why are so many products sold in 225 g or 450 g sizes?
- Those are rounded conversions of 8 oz and 16 oz. Packaging designed for imperial markets kept its physical size when the label switched to metric.
Is my input uploaded anywhere?
- No. The conversion happens locally in your browser.
Last updated:
Sources: 1959 international yard and pound agreement (avoirdupois ounce = 28.349523125 g exactly); NIST Handbook 44; FDA nutrition labelling serving-size regulations.