Convert Ounce to Gram

What this conversion means in practice

US cans and spice jars quote ounces; metric scales want grams. Multiplying by 28.349523125 g per oz keeps spice and supplement math aligned with the pound–kilogram standard.

Eight ounces is about 227 grams—one stick of butter’s familiar US portion. Sixteen ounces still equals one pound, so you can cross-check large values against the lb↔g pages.

Start from the ounce count on the label; the table scales the same factor for multi-ingredient shopping lists.

How to convert ounce to gram

Multiply the ounce value by 28.3495 to get gram.

Example: 8 oz × 28.3495 = 226.796 g

Ounce

Definition: The avoirdupois ounce (oz) is 1/16 of a pound, equal to 28.349523125 grams. This is the ounce used for food and general weight in the US customary system.

History and origin: Different ounce definitions existed historically, including the troy ounce used for precious metals. Modern everyday weight conversion uses the avoirdupois ounce standardized with the pound.

Current use: Ounces are common in food packaging, recipes, and shipping. In technical contexts, confirm the ounce type, since precious-metal pricing uses a different standard.

Gram

Definition: A gram (g) is one-thousandth of a kilogram. It is a small metric mass unit used where kilogram precision would be too coarse.

History and origin: The gram entered modern metrology during the metric reforms of the late 18th century. It became the practical everyday companion unit to the kilogram in labs, food labeling, and retail.

Current use: Grams are common in nutrition labels, cooking, medicine packaging, and chemistry. They are often the bridge unit when moving between small and large metric masses.

Ounce to Gram conversion table