Ounce to Gram Converter
Our free volume & weight converter handles ounce gram conversions. See tables, ratios, and examples for quick reference.
Reviewed for accuracy by Manoj Kumar, Mathematics Educator
Formula
Grams = Ounces x 28.3495 (avoirdupois) or x 31.1035 (troy)
Multiply ounces by 28.3495 for standard avoirdupois ounces, or by 31.1035 for troy ounces used with precious metals. Divide grams by the same factor for the reverse conversion.
Worked Examples
Example 1: Cooking Ingredient Conversion
Problem:A recipe calls for 6 ounces of chocolate. How many grams is that?
Solution:Grams = 6 oz x 28.3495 g/oz = 170.097 grams Kilograms = 170.097 / 1000 = 0.170 kg Pounds = 6 / 16 = 0.375 lb
Result:6 oz = 170.097 grams
Example 2: Gold Weight Conversion
Problem:A gold bar weighs 100 grams. How many troy ounces is that?
Solution:Troy ounces = 100 g / 31.1035 g/troy oz = 3.2151 troy oz Avoirdupois ounces = 100 / 28.3495 = 3.5274 oz Carats = 100 x 5 = 500 carats
Result:100 grams = 3.2151 troy ounces
Frequently Asked Questions
How many grams are in an ounce?
One avoirdupois ounce (the standard ounce used for food and everyday items) equals 28.3495 grams. One troy ounce (used for precious metals like gold and silver) equals 31.1035 grams. The avoirdupois ounce is by far the more common measurement and is what people typically mean when they say ounce. The difference between the two is about 10%, which is significant when buying or selling precious metals.
What is the difference between avoirdupois and troy ounces?
Avoirdupois ounces are the standard ounces used in everyday life for food, postage, and general weight measurements. There are 16 avoirdupois ounces in a pound. Troy ounces are heavier at 31.1035 grams versus 28.3495 grams and are used exclusively for precious metals, gemstones, and some pharmaceuticals. There are 12 troy ounces in a troy pound. When gold is quoted at a certain price per ounce, it always refers to troy ounces.
How do I convert ounces to grams for cooking?
For cooking, multiply ounces by 28.35 to get grams. Common kitchen conversions include: 1 oz = 28.35 g, 4 oz = 113.4 g (quarter pound), 8 oz = 226.8 g (half pound), and 16 oz = 453.6 g (one pound). Many kitchen scales can switch between ounces and grams. For baking, using grams provides more precision since small differences in ingredient amounts can affect the outcome significantly.
Why do some countries use grams and others use ounces?
Most countries worldwide use the metric system with grams and kilograms as standard weight measurements. The United States, Liberia, and Myanmar are the only countries that have not officially adopted the metric system for everyday use. The US still primarily uses ounces and pounds for food labeling, cooking, and commerce. However, US food labels are required to show both ounces and grams, and scientific work in the US uses metric exclusively.
Why do US recipes measure by volume in cups while European recipes measure by weight in grams?
The difference is largely historical rather than practical. American home cooking developed around standardized measuring cups and spoons that were cheap to manufacture and easy to teach, so recipes settled on volume measures for convenience. European and professional baking traditions favor weight because a gram of flour is the same regardless of how it is scooped or packed, while a cup of flour can vary by 20 percent or more depending on whether it was sifted, spooned, or scooped directly from the bag. For baking specifically, where ratios of flour, fat, and liquid must be precise, weighing ingredients in grams (or ounces on a kitchen scale) produces far more consistent results than volume measuring, which is why professional bakers and most European cookbooks specify weight.
References
Reviewed for accuracy by Manoj Kumar, Mathematics Educator ยท Editorial policy
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