Ounces to Grams Converter

The converter above is already set to ounces and grams, so you only need to enter your number. The result updates as you type, and nothing is sent anywhere.

1. Type your value in the Value box, for example 8. Decimals and negative numbers are accepted.
2. Check that From shows ounces and To shows grams. Both menus can be changed if you need a different pair.
3. Read the answer in the large result box. The note under it shows the exact factor used for one ounce.
4. Press Copy result to put the answer on your clipboard, or Swap units to convert in the opposite direction.
5. Look at In every unit on the right to see the same amount in all the other weight units.

One ounce is about 28.3495 grams, so the formula is grams = ounces x 28.3495. Going the other way, one gram is about 0.035274 ounces. An avoirdupois ounce is one sixteenth of a pound, which is 28.349523125 grams. A gram is one thousandth of a kilogram, about the mass of a paper clip.

Worked examples with the same factor:

• 8 ounces: 8 x 28.3495 = 226.796 grams
• 20 ounces: 20 x 28.3495 = 566.99 grams
• 80 ounces: 80 x 28.3495 = 2,267.96 grams

Multiply by 28 for a rough value: 8 ounces is about 224 g, exactly 226.8.

To check the converter by hand, take 20 ounces and apply the rule once: the result should be 566.99 grams. If you go back again with the reverse factor 0.035274 you land on 20 ounces, which confirms that the two directions agree. Rounding the factor to fewer digits for mental math gives a result that is close but not identical, so use the tool when the last digits matter.

These reference values come from the same factor the converter uses, so they match what you see above. Use the table for common amounts, and the converter for anything else.

Pounds, ounces and stone belong to the avoirdupois system, while grams and kilograms belong to the metric system. Since 1959 the pound has been defined as exactly 0.45359237 kilograms in the United States and the Commonwealth, so conversions are exact rather than approximate. Shops, gyms, airlines and doctors each pick one system, which is why people switch between them so often.

Use the table as a sanity check rather than a substitute for the converter. The result must scale with the input: double the weight and the converted figure doubles. For anything that matters, such as a medicine dose or a shipping charge, read the unit printed on the scale or label first, because the same number means very different things in each system.

Recipes, postage and kitchen scales mix ounces and grams, and US recipes call for ounces where European cookbooks list grams.

Weight and mass are used interchangeably in everyday speech, and these units measure mass. The pound-mass and kilogram conversion is exact, but a kitchen scale can only show the precision it was built with, so do not trust more decimals than the scale gives. Also keep ounces of weight apart from fluid ounces of volume.

Related pages: Grams to Ounces Converter for the reverse direction, and the pounds to ounces and grams to kilograms pages. For other weight units use the weight converter.

The page keeps no history, so each visit starts again from the defaults, 8 ounces. Your numbers are processed by JavaScript in your own browser and are never sent to a server, which makes the converter safe for private figures such as medical, financial or work measurements.