Convert ounces to grams (oz to g)
To convert ounces to grams, multiply the value in ounces by 28.349523125. Bakers following American recipes, people tracking food portions and anyone weighing a parcel use it. This ounces to grams converter works both ways: type ounces or grams into either box above and the other box, the worked formula and the chart below update as you type.
The ounce (oz) used for food is the avoirdupois ounce: 1/16 of a pound, or exactly 28.349523125 grams. Ounces are used in the US for food packaging, portion sizes, postage and baby weights. They are not the same as fluid ounces, which measure volume, or the troy ounces used for gold. One ounce is 28.3495 grams.
The gram (g) is one thousandth of a kilogram. When the metric system was created in the 1790s it was defined as the mass of one cubic centimeter of water. Going the other way, one gram equals 0.035274 ounces. Grams are used for food labels and recipes, nutrition facts, postage, jewelry and medicine doses around the world.
How to convert ounces to grams with this tool
- Type a number into the Ounces (oz) box — it starts at 8 oz as an example.
- Read the answer in the Grams (g) box and in the result panel, which also shows the formula with your number.
- To go the other way, type into the grams box, or press the swap button to open the Grams to Ounces converter with your value carried over.
- Choose how many decimal places you want, or tap a quick value such as 2 oz, 4 oz, 8 oz.
- Press Copy result to paste the conversion into a message, spreadsheet or note.
Ounces to Grams converter features
Converts both ways
Type in the ounces box to get grams, or in the grams box to get ounces. The other box follows instantly.
Exact factor
Calculations use 1 oz = 28.349523125 g, and rounding is applied only to the answer you see — choose Auto or 0–10 decimal places.
Formula with your number
The working is shown under the result, for example 8 oz × 28.349523125 = 226.7962 g, so you can check it or copy the method.
Quick values and chart
Tap common values like 2 oz, 4 oz, 8 oz, or read the ounces-to-grams table further down this page.
Ounces to Grams formula
The formula is g = oz × 28.349523125. It is exact because an avoirdupois ounce is 1/16 of a pound, which makes it exactly 28.349523125 grams.
The reverse formula is oz = g ÷ 28.349523125 — or use the Grams to Ounces converter. Three worked examples:
- An 8 oz steak: 8 oz × 28.349523125 = 226.7962 g
- One pound (16 oz): 16 oz × 28.349523125 = 453.5924 g
- A 1.5 oz chocolate bar: 1.5 oz × 28.349523125 = 42.5243 g
Ounces to Grams quick reference
The values people look up most often, worked out with the exact factor:
- 1 oz = 28.3495 g
- 1 g = 0.035274 oz
- 2 oz = 56.699 g
- 4 oz = 113.3981 g
- 8 oz = 226.7962 g
- 12 oz = 340.1943 g
Quick tip: Multiply by 30 for a rough figure, or by 28 for a closer one: 10 oz ≈ 280 g, versus the exact 283.4952 g.
Related conversions: Pounds to Grams, Grams to Pounds and the full weight converter.
Ounces to Grams conversion table
Values in grams are rounded to 4 decimal places (more for very small numbers). For any value not listed, type it into the converter above.
| oz | g | oz | g |
|---|---|---|---|
| 0.25 | 7.0874 | 11 | 311.8448 |
| 0.5 | 14.1748 | 12 | 340.1943 |
| 1 | 28.3495 | 13 | 368.5438 |
| 2 | 56.699 | 14 | 396.8933 |
| 3 | 85.0486 | 15 | 425.2428 |
| 4 | 113.3981 | 16 | 453.5924 |
| 5 | 141.7476 | 20 | 566.9905 |
| 6 | 170.0971 | 24 | 680.3886 |
| 7 | 198.4467 | 32 | 907.1847 |
| 8 | 226.7962 | 48 | 1,360.7771 |
| 9 | 255.1457 | 64 | 1,814.3695 |
| 10 | 283.4952 |
Ounces to Grams FAQ
How many grams is 4 oz?
4 ounces is 113.3981 grams: 4 oz × 28.349523125 = 113.3981 g.
How do I convert ounces to grams?
Multiply the value in ounces by 28.349523125. For example, 12 oz × 28.349523125 = 340.1943 g. To convert back, divide the value in grams by 28.349523125 — or use the Grams to Ounces converter.
How many ounces are in one gram?
One gram is 0.03527 ounces, because 1 g ÷ 28.349523125 = 0.03527 oz.
What is 12 ounces in grams?
Are fluid ounces and ounces the same?
No. Ounces (oz) measure weight; fluid ounces (fl oz) measure volume. One US fluid ounce of water weighs about 29.5 g, close to but not the same as 1 oz = 28.3495 g. For liquids by volume, use the oz to mL converter.