Ounces to Grams

How to use Ounces to Grams Converter

1. 1
   Confirm it is a weight. Flour, butter and sugar are weight ounces; anything poured is probably fluid ounces.
2. 2
   Enter the ounces. The pounds-and-ounces breakdown is shown for larger amounts.

About converting ounces to grams

The ounce used for flour, sugar and butter is a unit of mass equal to 28.3495 grams, and sixteen of them make a pound. It shares its name with the fluid ounce, which measures volume, and that collision causes more recipe errors than the arithmetic ever does. American recipes freely use both — ounces for solids, fluid ounces for liquids — and often write both as "oz", leaving the reader to infer which from the ingredient. The rule of thumb is that anything poured is volume and anything scooped or cut is weight, but the ambiguity is real and occasionally unresolvable. Converting to grams is worth doing regardless of which system you prefer, because weight is unambiguous in a way volume is not. A cup of flour can vary by twenty percent depending on whether it was scooped, spooned or sifted, and that variation is the single biggest reason a recipe behaves differently in two kitchens. Grams remove it entirely. There is one more ounce to be aware of. The troy ounce, used exclusively for precious metals, is 31.103 grams — roughly ten percent heavier than the ordinary avoirdupois ounce. Gold and silver are priced per troy ounce, so applying the standard conversion to a bullion price produces an answer that is off by a tenth, which is a large error in the one context where the number is money.

Frequently asked questions