Ounce to Gram Converter
Our free volume & weight converter handles ounce gram conversions. See tables, ratios, and examples for quick reference.
Reviewed 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\nKilograms = 170.097 / 1000 = 0.170 kg\nPounds = 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\nAvoirdupois ounces = 100 / 28.3495 = 3.5274 oz\nCarats = 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.
References
Reviewed by Manoj Kumar, Mathematics Educator · Editorial policy