How to find out disk space?

I know two ways to get some information about HD space. One is to Control-click on Mac HD and select Get Info. A dialog is displayed with detail information which contain Capacity, Available and Used numbers in GB.
Another way is to use Terminal with command df -lhg. This command displays similar information. However, by using command, the numbers I get are less than those in Get Info. They are not the same. Not sure if my command is correct or not. If not, what is the correct command to get disk space information?

Great! I will not need to worry about to reset the BLOCKSIZE back to the default value.
One thing interesting. Before I installed the Snow Leopard, I checked my disk space with Get Info. My HD available space was about 466GB. After the OS update, Get Info shows the capacity as 499GB. I thought that I got 30GB more space back. Actually, today I realize that the Get Info value of the pre-OS as based on the binary decimal, and the Get Info value of the Snow Leopard is 10-based decimal! This explains my question about my question of the difference of the Get Info value and the value of command "df -lhg"! "df -lHg" shows the same result, which is 10-based decimal value! I actually did no get more than 30GB disk space.

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