To convert ounces to grams (oz to g), multiply by 28.349523. 1 ounce equals 28.349523 g, about 49% of a large egg.
| ounces | grams |
|---|---|
| 1 ounce | 28.349523 g |
| 2 ounces | 56.699046 g |
| 5 ounces | 141.74762 g |
| 10 ounces | 283.49523 g |
| 25 ounces | 708.73808 g |
| 50 ounces | 1,417.4762 g |
| 100 ounces | 2,834.9523 g |
| 250 ounces | 7,087.3808 g |
| 500 ounces | 14,174.762 g |
| 1000 ounces | 28,349.523 g |
Definition: 1/16 of a pound, or about 28.35 grams.
History: Traces back to the same Roman "uncia" that gave English the inch - both mean "a twelfth" in Latin, since the ounce was originally 1/12 of an ancient Roman pound rather than the 1/16 it is today.
Current use: Food packaging and recipes in the US. Precious metals worldwide use a completely different "troy ounce" instead, about 10% heavier than a regular ounce - the number quoted for a gold price is always a troy ounce.
Definition: 1/1000 of a kilogram - though it was actually the original base unit the kilogram was later built from, not the other way round.
History: Introduced during the same French Revolution-era push for the metric system, originally defined as the mass of one cubic centimeter of pure water. A single gram turned out to be too small and impractical for most everyday weighing, which is why the kilogram - not the gram - ended up as the actual SI base unit: an odd historical quirk that has stuck ever since.
Current use: Food nutrition labels, recipes, and small precise measurements worldwide - basically anything too small to comfortably measure in kilograms.
An ounce is exactly 28.349523125 grams, following from the pound being exactly 0.45359237 kilograms.
For a quick estimate, multiply by 28. That is off by about 1.2%, which is fine for a rough figure and not fine for anything you are paying for or building to. Use the exact factor of 28.3495 when it matters.
The reverse factor is 0.035, so one gram is that many ounces. Two decimal places is plenty for most purposes, and three is more than a tape measure can justify.
To anchor the scale: 1 ounce is about 28.3 g.