how many grams in troy ounce
1 Troy Ounce = 31.1034768 Grams. For other weight units conversion, please go to Weight Conversion. The conversion factor for weight units ounces to grams is 28.3495231. If the conversion is from troy ounces (for precious metals, gold, jewellery etc), it is 31.1034768. To find out how many grams in ounces, multiply by the conversion factor or simply use the converter below. 1 Ounce = 28.3495231 Grams. Ounce is a unit of mass (weight) in united states customary and imperial measurement systems. It is also used as a volume unit but then simply meant as fluid ounces which equals to about 30 milliliters in U.S. customary system.