How many percent of gold is in 18 karat gold

"Caratage" is simply the measurement of purity of gold alloyed with other metals. 24 carat is generally accepted as pure gold with no other metals. Lower caratages contain less gold; 18 carat gold contains 75% percent gold and 25% other metals, often copper or silver. An 18 carat gold represents 75% gold and other metals. This can be calculated by dividing the carats by 24. That is, 18/24=0.75 value of gold To get the percentage, multiply it by 100. That is 0.75×100=75% gold. There are some other values of gold that is sold they include; 0.999 0.995 0.990 or 22 carats, 14 carats etc depending on what you buy as gold. List of carats of Gold and the gold content Purity: 22 carat gold Gold content(wt.%):91.6 Fineness:916 Purity:18 carat gold Gold content(wt.%):75.0 Fineness:750 Purity:14 carat gold Gold content:58.5 Fineness:585 Purity:9 carat gold Gold content:37.5 Fineness:375