Ounces to Grams
Convert ounce to gram instantly — type a value and read the result, with the exact formula shown.
Example
1 oz = 28.34952 g, 5 oz = 141.7476 g, 10 oz = 283.4952 g.
How it works
Gram = Ounce × 28.34952. Every value is converted through a single kilogram base unit using internationally defined conversion factors, so any from/to pair stays consistent.
Good to know
Converting ounces to grams comes up constantly in the kitchen, where a recipe written in American or British cups-and-ounces needs to match a digital scale that only speaks metric. It is just as common when weighing letters and parcels against postage tiers, portioning ingredients for nutrition tracking, or following coffee and baking ratios that demand gram-level accuracy rather than rough scoops.
The two units sit on opposite sides of the metric-versus-imperial divide. The avoirdupois ounce is the everyday ounce used in the US and UK, defined as exactly 1/16 of a pound, which works out to precisely 28.349523125 grams. The gram is the metric workhorse, originally fixed as the mass of one cubic centimetre of water and now derived from the kilogram. Because the ounce is officially defined in metric terms, the conversion factor is exact rather than approximate.
For mental math, lean on a simple anchor: one ounce is just over 28 grams, so multiply ounces by 28 for a fast estimate and bump it up slightly. A quarter-pound (4 oz) is about 113 g, a half-pound (8 oz) is about 227 g, and a full pound (16 oz) is roughly 454 g. Rounding 28.35 down to 28 undershoots by only about 1.2 percent.
The biggest pitfall is mixing up ounce types. This converter uses the weight (avoirdupois) ounce, not the fluid ounce, which measures volume, and not the troy ounce used for gold and silver, which is heavier at about 31.103 g. Always confirm which ounce a recipe or spec sheet means before trusting the number.
Frequently asked questions
How do you convert ounce to gram?
Multiply the number of ounces by 28.34952 to get grams. For example, 1 oz = 28.34952 g.
What is 1 ounce in grams?
1 ounce equals 28.34952 grams (1 oz = 28.34952 g).
How many ounces are in 1 gram?
There are 0.03527396 ounces in 1 gram.
Is this converter free and private?
Yes. It runs entirely in your browser, so your inputs never leave your device, there is no sign-up, and it works offline once loaded.
Are the conversions exact?
Conversions use internationally defined factors and are exact where the definitions are exact (for example, 1 inch = 2.54 cm). Displayed results are rounded for readability.
People also ask
How many grams are in 8 ounces?
8 ounces equals 226.796 grams (8 × 28.34952). For everyday cooking this is usually rounded to 227 g, or about 0.5 pound.
Is an ounce of weight the same as a fluid ounce?
No. A weight (avoirdupois) ounce measures mass and equals 28.35 g, while a fluid ounce measures volume. They only coincide for water, where 1 fl oz of water weighs roughly 1 oz; for other liquids the gram weight differs by density.
How many grams is a quarter pound (4 oz)?
A quarter pound is 4 ounces, which equals 113.398 grams, commonly rounded to 113 g.
Why is 1 ounce sometimes listed as 28 grams instead of 28.35?
28 g is a rounded, easy-to-remember approximation, while the precise value is 28.34952 g. The rounding understates the true weight by about 0.35 g, which is fine for casual use but not for precise baking or lab work.
How do I convert grams back to ounces?
Divide the number of grams by 28.34952, or multiply grams by 0.03527396. For example, 100 g is about 3.527 oz.
Is a troy ounce of gold the same as a regular ounce?
No. A troy ounce, used for precious metals, equals about 31.1035 grams, which is heavier than the standard avoirdupois ounce of 28.34952 grams. This converter uses the standard avoirdupois ounce.
How many grams are in a 16 oz pound?
16 ounces equals 453.592 grams (16 × 28.34952), which is why a pound is often rounded to 454 g or roughly 0.45 kg.
What is 2 oz in grams for a recipe?
2 ounces equals 56.699 grams, usually rounded to 57 g in cooking. Two ounces is a common serving size for items like pasta or cheese.
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