How much is 22.5 grams of 18 k gold worth?

22k gold is about $36.38 (dwt) or $56.57 gm; let's say you have 40 gms of 22k so you multiply 40 gm by 56.57 =2.262.80 and then to be realistic multiply this amount by 0.8=$1810.24 this is worth.