Gold is measured in troy ounces. So when you see the price of gold is $1000 - this is for one troy ounce.
One troy ounce has 31.1.034768 grams in it. Many people round it up to 31.1. grams for simplicity sake
it is way easier to just go to In Gold We Trust which is a Coin, Bullion and Scrap Gold Calculator and it will work it out for you with the current price of gold
In Gold We Trust is an online coin bullion and scrap gold calculator that offers up to the minute valuations on all your gold coins, junk silver coins , scrap gold and so on