Oz to Grams

Ounces to Grams Conversion Formula

To convert ounces to grams, use this simple formula:

The avoirdupois ounce is defined as exactly 28.349523125 grams.

Step-by-Step Weight Conversion Guide

1. Take your weight in ounces
2. Multiply it by 28.3495 (the number of grams in one ounce)
3. Get your result in grams

Common Ounces to Grams Conversions

Practical Applications of Oz to Grams Converter

• Cooking & Baking: Converting American recipes to metric kitchen scales — 8 oz of flour is 226.8 g
• Nutrition: Protein and snack portions on food labels are often listed in ounces — a 3 oz chicken breast is about 85 g (careful: the "12 FL OZ" printed on a soda can measures volume, about 355 ml, not weight)
• Coffee: A 12 oz bag of beans is 340 g; espresso doses are measured in grams
• Shipping: Understanding US parcel weights on metric scales
• Baby weight: US birth weights use pounds and ounces; the rest of the world uses grams

History of Ounces and Grams

The ounce (from Latin "uncia", one-twelfth) descends from Roman weights and is used in the United States and, informally, in the United Kingdom. Since 1959 the international avoirdupois ounce is defined as exactly 28.349523125 grams. The gram is the metric unit of mass, originally the mass of one cubic centimeter of water; since 2019 it is defined via the Planck constant.

Quick Conversion Tips

For quick approximations, remember: 1 oz ≈ 28 g. To convert ounces to grams in your head, multiply by 28 and add a little: 4 oz × 28 = 112, plus ~1.4 = about 113 g (exact: 113.4 g). For precise results, always use the exact factor of 28.3495.