Ounces to Grams Converter
Convert Ounces (oz) to Grams (g) instantly, or use the conversion table below to look up common values.
Ounces to Grams conversion table
| Ounces (oz) | Grams (g) |
|---|---|
| 1 | 28.349523 |
| 2 | 56.699046 |
| 3 | 85.048569 |
| 4 | 113.398093 |
| 5 | 141.747616 |
| 10 | 283.495231 |
| 25 | 708.738078 |
| 50 | 1,417.476156 |
| 100 | 2,834.952313 |
How to convert Ounces to Grams
1 oz equals 28.349523 g. Use the converter above for any value, or read the table for common conversions.
g = oz × 28.349523125 · oz = g × 0.035273961949580414Multiply a ounces figure by 28.349523 to get grams, or divide it by 0.035274 to go the other way.
Worked examples
- 1 oz= 28.349523 g
- 5 oz= 141.747616 g
- 10 oz= 283.495231 g
- 25 oz= 708.738078 g
- 100 oz= 2,834.952313 g
What these units are
Ounces (oz). An ounce is exactly 28.349523125 grams, one sixteenth of a pound. It is used for food portions and postal weights, and precious metals use the different troy ounce of 31.1035 g.
Grams (g). A gram is one thousandth of a kilogram. It is used for food portions, recipe ingredients, jewellery and postal items, and it is the unit most kitchen scales show.
Metric conversions are exact. Results are displayed rounded, so values at the extreme ends of the scale — milligrams and tonnes — carry fewer significant digits than the middle of the range.
Converting Ounces to Grams in practice
Working in ounces
An ounce is exactly 28.349523125 grams and one sixteenth of a pound, so sixteen ounces make one pound. That definition makes it the avoirdupois ounce, the unit used for ordinary trade.
Ounces appear on postal and courier weight bands, on food packaging and recipe cards, and in the jewellery trade, though precious metals are quoted in the troy ounce.
The gram and kilogram factors are exact decimal relations, and the imperial factors are exact by definition. Display rounding can still change the last digit on a round trip.
The usual error is confusing the troy ounce with the avoirdupois ounce: the troy ounce is 31.1035 grams, while the avoirdupois ounce is 28.349523125 grams. Ounces suit small parcels and portions, not bulk freight.
Ounces are most often confused with grams in recipes and postal weights, because the factor is 28.349523125 rather than a simple power of ten. Precious metals are quoted in the troy ounce, which is not the same as this ounce.
Reading the result in grams
A gram is one thousandth of a kilogram, and it is defined through the kilogram, the SI base unit of mass. Metric prefixes scale it by powers of ten.
Grams appear on kitchen scales for food portions and recipe ingredients, on postal and courier labels for small packages, and in jewellery listings where the mass of metal or stones is stated.
Converting grams to kilograms or milligrams is a pure decimal shift and is exact. Imperial factors are exact by definition, but results are rounded for display, so a round trip can differ in the last digit.
A frequent error is reading a jewellery weight given in troy ounces as an avoirdupois ounce, since the troy ounce is 31.1035 grams. Grams suit small quantities, while kilograms suit body weight, market produce and freight.
The nearest sibling to a gram is the kilogram, and kitchen and market scales invite a mix-up; 500 grams is 0.5 kilograms, so a thousandfold slip is easy. Use grams for small portions and kilograms for bulk quantities.
Checking a ounces to grams conversion
Between the metric units a weight conversion is a power of a thousand, so grams to kilograms and kilograms to tonnes are decimal shifts. The imperial units are all defined against the kilogram, which makes every metric-to-imperial pair a multiplication with the same factor at any size.
The dimension where this goes wrong is the ounce, because the same word covers two different weights. An avoirdupois ounce is one sixteenth of a pound and is the one used for food and parcels; a troy ounce is about 10% heavier (31.1035 g) and is used for precious metals. A price per ounce is meaningless until you know which ounce is meant.
To check a weight conversion, convert the result back, or go through the pound or the kilogram as a middle step. The commonest error is converting a figure stated in pounds into kilograms and then comparing it with a figure that was already in kilograms, which doubles or halves nothing and merely hides the mistake.
Tanzania reference points
Real quantities, converted into the units on this page.
The most a packet declared between 500 g and 1 kg may fall short under Tanzanian weights and measures rules
15 g = 0.529109 oz
Table IIIC of the 2019 regulations allows an individual deficiency of 1.5%, or 15 g, on a nominal net content between 500 g and 1 kg. Regulation 179 separately requires the average net content of a whole lot to be at least what the packet declares, so the tolerance is on single packets rather than the batch.
Source: The Weights and Measures (General) Regulations, 2019 (GN No. 288) — Weights and Measures Agency · verified 2026-09-14
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