Convert Ounces to Grams

The Conversion Formula

To convert ounces to grams, multiply the value by the conversion factor: 1 oz = 28.3495 g. For a worked example, suppose you need to convert 25 oz to grams: 25 × 28.3495 = 708.74 g. To convert in the opposite direction, divide by 28.3495, or equivalently multiply by 0.035274.

About ounces

The ounce derives from the Roman 'uncia', meaning 'one twelfth', originally referring to 1/12th of a Roman pound. However, in the modern avoirdupois system used in the US and UK, an ounce is 1/16th of a pound. This unit is critical for precision in non-metric cooking and for measuring precious metals (though gold uses the 'troy ounce', which is slightly heavier). ounces are commonly used in Steak and meat portioning, Postal letter weights, Precious metals (Troy oz), and Liquid volume (fluid oz - different unit), Spices and seasonings.

A AA battery weighs just under 1 ounce.

About grams

The gram was the foundational unit of the original metric system in 18th-century France. Defined as the absolute weight of a volume of pure water equal to the cube of the hundredth part of a meter (1 cm³), it brought logic to a chaotic world of measurements. It remains the standard for cooking, chemistry, and postal services. The gram is the base for the CGS system, which preceded the modern SI system. grams are commonly used in Cooking and baking ingredients, Nutritional labels (sugar, protein), Gold and jewelry, and Letter mail weights, Laboratory chemistry.

A standard paperclip weighs approximately 1 gram.

When Would You Convert ounces to grams?

Converting between ounces and grams is one of the most common weight conversions. You might need this conversion when working with international specifications, following instructions written for a different measurement system, or comparing values across different standards. Having the conversion factor (1 oz = 28.3495 g) memorized or bookmarked can save time in professional and everyday contexts alike.