How to Convert Ounces to Grams
To convert ounces to grams, multiply the number of ounces by 28.3495 (the number of grams in an ounce). The formula is grams = ounces × 28.3495. The converter above does it instantly. For a fast estimate, multiply ounces by 28, which gets you within a fraction of a gram.
The Ounces to Grams Formula
One ounce equals 28.3495 grams, so multiplying by that factor converts any ounce figure to grams. This uses the standard avoirdupois ounce for food and everyday goods, not the troy ounce used for gold and silver (which is about 31.1 grams). For recipes, nutrition, and shipping, 28.3495 is the right number.
Worked Examples
1 ounce: 28.35 grams. 4 ounces: 113.40 grams. 8 ounces: 226.80 grams (half a pound). 16 ounces: 453.59 grams (one pound). A 12 ounce drink is about 340 grams, and a 6 ounce portion of chicken is about 170 grams.
Common Ounce to Gram Values
Quick reference: 1 oz ≈ 28.35 g, 2 oz ≈ 56.70 g, 4 oz ≈ 113.40 g, 8 oz ≈ 226.80 g, and 16 oz ≈ 453.59 g. Cooks often round to 1 oz = 28 g for quick mental math, then use the converter for an exact figure when precision matters, such as in baking.
Why Convert Ounces to Grams?
Ounces are standard in the United States for food, ingredients, and mail, while grams are the metric unit used in most recipes and on nutrition labels worldwide. Converting ounces to grams is essential when following an international recipe on a gram scale, weighing ingredients precisely for baking, checking nutrition information, or preparing a shipment by metric weight. Grams allow finer measurement than ounces, which is why precise cooking and science prefer them — and why this conversion is so common.
Ounces, Grams, and Precision
Baking in particular rewards converting ounces to grams, because grams give a more precise measurement than fractional ounces and produce more consistent results. Where a recipe might call for “4.5 ounces” of flour, weighing 128 grams is easier to hit exactly on a digital scale. The same precision helps with portioning, postage, and any task where a small difference matters. The converter also supports kilograms, pounds, and stone, so you can switch between all the common weight units as needed.
Frequently Asked Questions
How many grams is 1 ounce?
1 ounce is about 28.35 grams.
How do I convert ounces to grams?
Multiply the ounces by 28.3495. For example, 8 oz × 28.3495 = 226.8 grams.
How many grams is 8 ounces?
8 ounces is about 226.8 grams (half a pound).
Baking Precision
Baking is where ounces-to-grams conversion really pays off. Flour, sugar, and butter behave best when measured by weight rather than volume, and grams allow finer precision than fractional ounces, so professional and serious home bakers weigh in grams. Converting a recipe’s ounces to grams — 4 ounces of flour to 113 grams, 8 ounces of sugar to 227 grams — lets you hit each amount exactly on a digital scale, which produces more consistent rises, textures, and results batch after batch. It also makes scaling a recipe up or down far easier than juggling cups and fractions.
Portions, Postage, and Products
Outside baking, converting ounces to grams helps with portion control (a 6-ounce steak is about 170 g), nutrition tracking, and shipping, where metric weights are often required. Many products are labeled in both units, but when only ounces are given and you need grams — for a recipe, a scale, or a customs form — multiplying by 28.3495 gives the exact figure. Remember this is the avoirdupois ounce for everyday goods; precious metals use the heavier troy ounce (about 31.1 g), so do not use this conversion for gold or silver. For all common weights, the converter also supports pounds, kilograms, and stone.