When the label simply says oz
For a net weight or food portion, multiply oz by 28.349523125. Using 28.3495 is more than precise enough for an early packaging estimate.
oz × 28.349523125
A quick check before you choose a pack
Oz to Grams Converter
An ounce on a recipe, label, or filling sheet does not always mean the same thing. Use this calculator to turn weight oz into grams—or convert US fl oz when you have the product density.
If the specification means weight, 1 oz is exactly 28.349523125 g. If it says fl oz, you are looking at volume, and density becomes part of the answer.
Convert ounces to grams
Start with the unit on the source document. The calculator updates as you type.
Conversion result
28.3495 g
Formula used
grams = oz × 28.349523125
What do common ounce sizes look like in grams?
These are weight-ounce conversions—the useful version when a portion or net weight is written in oz.
| Ounces (oz) | Grams (g) | Rounded grams | Possible packaging use |
|---|---|---|---|
| 0.1 oz | 2.835 g | 2.83 g | Seasoning or sample |
| 0.5 oz | 14.1748 g | 14.17 g | Dip or condiment portion |
| 1 oz | 28.3495 g | 28.35 g | Small snack or ingredient portion |
| 2 oz | 56.699 g | 56.7 g | Sauce, topping, or side |
| 4 oz | 113.3981 g | 113.4 g | Small prepared-food portion |
| 8 oz | 226.7962 g | 226.8 g | Medium meal component |
| 16 oz | 453.5924 g | 453.59 g | One-pound bulk or family pack |
Treat the last column as a sense check, not a container recommendation. Two foods with the same weight can occupy very different amounts of space.
10 oz
= 283.5 g
10 US fl oz
= 295.7 mL
oz / fl oz
Before you calculate, check whether it says oz or fl oz
One is weight and the other is volume. That small pair of letters matters: a 4 fl oz cup will not necessarily hold 4 oz by weight. The food's density, the space left under the lid, and even its shape all affect the real fill.
10 oz
= 283.495 g
10 US fl oz
= 295.735 mL × g/mL
The arithmetic is easy. Choosing the right ounce is the important part.
Working back from a gram target
Divide grams by 28.349523125. A 100 g target, for example, comes to about 3.5274 oz.
g ÷ 28.349523125
When the document says fl oz
Convert the US fluid ounces to millilitres first, then multiply by the finished product's density. This is the route for dressings, sauces, oils, and other flowable foods.
fl oz × 29.5735295625 × g/mL
What the calculator cannot decide for you
The number is useful. It is not the whole packaging decision.
Once you have the gram figure, take it to a real fill test. That is where the container, lid, headspace, and shipping weight come into the picture.
Keep food weight and pack weight separate
Net weight is the food. Tare is the empty pack. Add them together only when you need the filled-unit weight for cartons or freight.
Put the actual food in the actual container
A nominal mL or fl oz capacity cannot tell you how a chunky salad, rice dish, powder, or thick sauce will sit. Fill it, close the lid, and see.
Measure the product you will really fill
For liquids and semi-liquids, use the density of the finished recipe at a stated temperature. A generic internet value is fine for a sketch, not a production setting.
Label declarations and filling tolerances vary by market and process. Confirm both before the pack goes into production.
How we would use this number during a sample check
- 1
Look at the original label or filling sheet and confirm whether the unit is oz or US fl oz.
- 2
Run the conversion. If it is fl oz, use a density measured from the finished food—not a convenient guess.
- 3
Portion the food into the shortlisted pack, leave the intended headspace, fit the lid, and weigh the filled unit.
A few details worth checking twice
How many grams are in 1 oz?
One standard weight ounce equals exactly 28.349523125 grams, commonly rounded to 28.35 g.
How many grams is 0.5 oz?
0.5 weight oz equals 14.1748 g, or 14.17 g when rounded to two decimal places.
Is 1 fl oz always 28.35 grams?
No. A fluid ounce is volume. One US fl oz equals 29.5735 mL, and its mass equals that volume multiplied by product density.
Does the package material change the conversion?
No. Glass, paper, bagasse, PLA, PP, or PET does not change the mass conversion. Package material changes tare weight and performance, not the number of grams in one weight ounce.
Have a target fill but not the right container yet?
Tell us what the food is, how much goes in, whether it is served hot or cold, and where it will be sold. We can narrow the packaging options before you spend time on samples.