What this calculator does
Ounces to grams is one of the most common kitchen and postage conversions, since recipes and food labels split roughly evenly between the two units depending on where they were written. One ounce is exactly 28.3495 grams, so a figure like 6 oz to gm comes to 170.1 g, a conversion worth having handy rather than re-deriving each time.
This calculator converts ounces to grams or grams to ounces, both directions, using the precise 28.3495 g factor rather than a rounded 28 or 30. The result also shows the equivalent in kilograms or pounds, useful when the figure is large enough that grams or ounces alone lose their sense of scale.
The formula
One avoirdupois ounce, the everyday ounce used for food and postage, equals exactly 28.3495 grams. Converting ounces to grams means multiplying by 28.3495; converting grams to ounces means dividing by the same factor.
| Term | Meaning |
|---|---|
| Ounce (oz) | A unit of weight equal to exactly 28.3495 grams, part of the imperial and US customary systems. |
| Gram (g) | The base metric unit of mass used on food labels and kitchen scales worldwide. |
| 28.3495 | The exact number of grams in one avoirdupois ounce, used in both directions of this conversion. |
The inputs explained
| Field | What to enter |
|---|---|
| Value | The value to convert, either a number of ounces or a number of grams, depending on the direction chosen below. |
| Convert | Choose whether to convert ounces to grams, or grams to ounces. |
When to use it
Converting a recipe between measurement systems
A recipe written in ounces converts to grams for a metric kitchen scale, or the reverse, without needing to round the ingredient amount.
Checking a food label or nutrition panel
Serving sizes are sometimes given in ounces on US packaging and grams elsewhere, so converting lets the two be compared directly.
Working out postage or parcel weight
Postal weight bands are often quoted in ounces in some regions and grams in others, so converting avoids picking the wrong band.
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
Ounces to grams, for common kitchen amounts
A range of ounce values, each converted to grams.
| Ounces | Grams | In kilograms |
|---|---|---|
| 1 | 28.3 g | 0.0283 kg |
| 2 | 56.7 g | 0.0567 kg |
| 4 | 113.4 g | 0.1134 kg |
| 6 | 170.1 g | 0.1701 kg |
| 8 | 226.8 g | 0.2268 kg |
| 16 | 453.6 g | 0.4536 kg |
Grams to ounces, for common amounts
A range of gram values, each converted to ounces.
| Grams | Ounces | In pounds |
|---|---|---|
| 25 | 0.882 oz | 0.0551 lb |
| 50 | 1.764 oz | 0.1102 lb |
| 100 | 3.527 oz | 0.2205 lb |
| 200 | 7.055 oz | 0.4409 lb |
| 250 | 8.818 oz | 0.5512 lb |
| 500 | 17.637 oz | 1.102 lb |
Questions
How many grams is 6 oz?
170.1 g, from 6 × 28.3495.
How many grams is 1 oz?
28.3495 g exactly, the defining conversion factor.
How do I convert grams back to ounces?
Divide the number of grams by 28.3495. For example, 100 g ÷ 28.3495 comes to about 3.527 oz.
Is this the same ounce used for liquids?
No. This is the avoirdupois ounce, a unit of weight. A fluid ounce measures volume and is a different, unrelated unit, despite sharing the name.
For the full metric and imperial mass ladder, milligrams up to tonnes and both kinds of ton, see the weight and mass converter. For a liquid measured by volume rather than weight, see the cup to mL converter.