How to Convert Ounces to Grams

Converting ounces to grams is a frequent task in cooking, baking, nutrition, and postal services. The ounce (avoirdupois) is a unit of weight used in the United States and a few other countries, while the gram is the standard small-weight unit in the metric system used worldwide. Many recipes, nutritional labels, and shipping regulations require conversions between these two units.

One ounce equals approximately 28.3495 grams. To convert ounces to grams, multiply the number of ounces by 28.3495. For a quick approximation, you can multiply by 28 or even round to 30 for very rough estimates. For example, 4 ounces is about 113.4 grams. Note that 16 ounces make one pound, so 16 oz equals about 453.6 grams. Our calculator also shows the kilogram equivalent for larger quantities.

This conversion is most commonly used in the kitchen. Many international recipes list ingredient amounts in grams, while American measuring cups and spoons relate to ounces. Bakers especially need precise gram measurements for consistent results. Nutritionists converting between food labels in different countries also rely on this conversion. The postal service uses ounces for letter weight in the US but grams are the international standard.

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