Ounces to Grams Converter
Convert ounces to grams, or grams to ounces, with the exact factor shown.
What this tool does
To convert ounces to grams, multiply by 28.3495. So 1 oz is 28.35 g, 4 oz is 113.4 g and 16 oz (one pound) is 453.6 g. To convert grams to ounces, divide by 28.3495. Enter a value above for the exact result.
Converts between ounces, grams, kilograms, pounds using exact factors, and shows the factor used.
Updates as you type, and the swap button reverses the direction.
How to use it
- Enter the value in ounces, or press Swap units to start from grams.
- Pick another unit from the lists if you need a different one.
- Read the result and the factor beneath it.
- Press Copy to copy the result.
Why use this converter
Converts ounces to grams (and back) with the exact factor of 28.349523125 g per ounce. Recipes, postage and product labels switch between ounces and grams, and rounding an ounce to 30 grams adds up fast in baking. An exact conversion avoids that.
Why we built it
We built the ounces to grams converter to use the exact avoirdupois ounce and to warn about fluid and troy ounces. Convert pounds with the kg to lbs converter and ingredients by volume with the ml to grams converter.
Handy alongside this: the Stone to Kilograms Converter.
Who this tool is for
- Cooks following recipes in the other unit
- Bakers who weigh ingredients
- People posting parcels
When to use it
- Following a recipe written in the other unit.
- Weighing parcels or letters for postage.
- Reading nutrition and product labels.
- Precious metal or ingredient weights.
How it works
One avoirdupois ounce is exactly 28.349523125 grams (1/16 of a pound of 453.59237 g). Troy ounces, used for gold and silver, are heavier at 31.1035 g and are not the same unit.
| Ounces | Grams |
|---|---|
| 1 oz | 28.3495 g |
| 2 oz | 56.699 g |
| 4 oz | 113.398 g |
| 8 oz | 226.796 g |
| 16 oz | 453.592 g |
| 100 oz | 2834.95 g |
What you give it, and what you get back
| Item | Details |
|---|---|
| Value | A number in the "from" unit. Decimals and negative numbers are accepted. |
| From and To | Any of 4 units: Ounces, Grams, Kilograms, Pounds. |
| Result | The converted value and the exact conversion factor. |
Issues you may run into
| What you see | Why it happens | What to do |
|---|---|---|
| Fluid ounces give a different answer | Fluid ounces measure volume, not weight. | Use the volume converter, or the mL to grams tool with the ingredient. |
| Gold weight looks wrong | Precious metals use troy ounces. | Use 31.1035 g per troy ounce. |
| Baking result is a little off | Rounding an ounce to 28 or 30 g. | Use the exact figure shown. |
Assumptions and limitations
- Results are shown with practical rounding; the calculation itself uses exact factors.
- It converts a number between units - it does not know what the quantity is.
Frequently asked questions
How many grams are in an ounce?
One ounce is exactly 28.349523125 grams, usually rounded to 28.35.
How do I convert ounces to grams?
Multiply the ounces by 28.3495.
How many ounces is 100 grams?
100 grams is about 3.527 ounces.
What is a troy ounce?
A heavier ounce (31.1035 g) used for precious metals. This converter uses the everyday avoirdupois ounce.
Is a fluid ounce the same?
No. A fluid ounce measures volume; use the volume converter.
Is it free and private?
Yes. It runs in your browser.