How To Convert Ounces to Gram
Formula: 1 ounce = 28.349523125 gram
Example: Convert 3.5 ounces to gram.
3.5 × 28.349523125 = 99.2233309375 gram
To convert ounces to gram, you multiply the number of ounces by 28.349523125.
This works because an ounce is a fixed fraction of a pound, and a gram is a fixed part of a kilogram.
Use the same formula for cooking, shipping, and any small weight where you need metric units.
Quick Answer
1 Ounces = 28.349523125 Gram
- 2 ounces = 56.69904625 gram
- 8 ounces = 226.796185 gram
- 16 ounces = 453.59237 gram
Conversion Formula
gram = ounces × 28.349523125
This means you take your weight in ounces and multiply by 28.349523125 to get the same weight in grams.
The number 28.349523125 is the standard definition of an avoirdupois ounce in grams, used in science, trade, and textbooks.
- Write down the value in ounces.
- Multiply it by 28.349523125.
- The result is the value in grams.
Ounce
An ounce is a unit of mass used mostly in the United States and a few other places. Its symbol is oz.
The modern ounce comes from older European weight systems and was standardized through the avoirdupois system. Today it is defined exactly as 1/16 of an avoirdupois pound.
- Measuring food portions and cooking ingredients
- Nutrition labels and packaged foods
- Mail and small parcel weights
- Body weight tracking in some fitness contexts
- Small retail items sold by weight
Gram
A gram is a metric unit of mass. Its symbol is g.
The gram is part of the metric system that grew out of French scientific work in the late 1700s. In modern SI use, grams are linked to the kilogram, which is defined by a fixed physical constant.
- Cooking and baking in metric recipes
- Food packaging and nutrition information
- Medicine and supplement measurements
- Laboratory sample masses
- Jewelry and small material weights
Is this Conversion of Ounces To Gram Accurate?
Yes. This converter uses the exact, internationally accepted definition of the avoirdupois ounce: 1 oz = 28.349523125 g. This value is derived from fixed standards used in engineering, trade, and education, so the result is reliable for daily use and careful measurement.
For how we choose and verify standard constants, see our accuracy standards.
Real Life Examples
Ounces are common in US labels and kitchen tools, while grams are common in most of the world. Here are practical conversions you may actually use.
- Cooking butter: A recipe calls for 4 ounces of butter. That is 4 × 28.349523125 = 113.3980925 g, so you can weigh it on a gram scale.
- Coffee beans: You measure 2.5 ounces of beans. That is 2.5 × 28.349523125 = 70.8738078125 g for a metric brew recipe.
- Protein powder: A scoop says 1.2 ounces on the container. That is 1.2 × 28.349523125 = 34.01942775 g.
- Mailing a small parcel: Your package weighs 10 ounces. That equals 283.49523125 g, helpful if a courier asks for grams.
- Snack portion: A bag lists a 1 ounce serving. That is 28.349523125 g, useful for tracking food by grams.
- DIY soap or candles: You need 6 ounces of wax. That equals 170.09713875 g for a metric kitchen scale.
- Small lab sample: A sample mass is 0.5 ounce. That equals 14.1747615625 g for recording in metric units.
Quick Tips
- Remember the key fact, 1 oz = 28.349523125 g.
- For a fast estimate, use 1 oz ≈ 28.35 g, then refine with the full value if needed.
- To convert many items quickly, convert 8 oz first, it is 226.796185 g, then scale up or down.
- 16 oz is exactly 453.59237 g, which is also 1 pound in grams.
- Half an ounce is 14.1747615625 g, useful for small recipe adjustments.
- Always keep the same unit type, ounces of mass (oz) are not the same as fluid ounces (fl oz).