How Many Grams Are in an Ounce?

This weight conversion is fixed for any substance, since both units measure mass rather than volume.

It's the number to use when a recipe or package lists ounces but your scale reads in grams.

US grocery products, from cheese to deli meat, are commonly priced and labeled by the ounce, making this one of the most frequent everyday conversions for shoppers cross-referencing a metric recipe.

This conversion is also foundational to the ounces-to-grams pair used throughout cooking, shipping, and nutrition contexts — memorizing the 28.35 figure covers a large share of common weight conversions.

Jewelry and precious metal appraisers occasionally need to clarify this distinction for customers who assume a 'gram of gold' converts the same way as a kitchen ingredient, when in fact troy ounces apply instead.

The avoirdupois ounce equals exactly 28.349523125 grams under the international 1959 agreement that formally linked US customary weight units to the metric system.

This is the same standard ounce used for food, everyday goods, and most consumer product labeling in the US, distinct from the heavier troy ounce (31.1g) reserved for precious metals.

USDA FoodData Central lists gram weights as the primary measurement for most of its database entries, with ounce figures calculated from the gram data using this fixed 28.35g factor.

The National Institute of Standards and Technology's Handbook 44 formally documents the avoirdupois ounce's exact gram equivalent, serving as the reference standard for US commercial weighing and measuring devices.

US grocery products, from cheese to deli meat, are commonly priced and labeled by the ounce, making this one of the most frequent everyday conversions for shoppers cross-referencing a metric recipe.

This conversion is also foundational to the ounces-to-grams pair used throughout cooking, shipping, and nutrition contexts — memorizing the 28.35 figure covers a large share of common weight conversions.

Home cheese-making and charcuterie hobbies, which require precise salt and culture ratios by weight, frequently need this conversion when following a recipe that mixes ounce and gram measurements.

Specialty spice retailers selling by weight often list small jars in both grams and ounces, helping customers compare value against bulk bin pricing typically shown per ounce.

Home coffee roasting hobbyists tracking bean weight loss during roasting (a process called 'the crack,' which measurably reduces bean weight) frequently log data in both grams and ounces depending on their scale's default setting.