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How much would it cost me to buy one gold futures contract on Comex?
Brokers usually have this kind of information, you can take a look at interactive brokers for instance: http://www.interactivebrokers.co.uk/contract_info/v3.6/index.php?action=Details&site=GEN&conid=90384435 You are interested in the initial margin which in this case is $6,075. So you need that amount to buy/sell 1 future. In the contract specification you see the contract is made for 100 ounces. At the current price ($1,800/oz), that would be a total of $180,000. It is equivalent to saying you are getting 30x leverage. If you buy 1 future and the price goes from $1,800 to $1,850, the contract would go from $180,000 to $185,000. You make $5,000 or a 82% return. I am pretty sure you can imagine what happens if the market goes against you.  Futures are great! (when your timing is perfect).