How can I check the capacity of my Mac's hard drive?

does any one know how I can chick the size of my Macks hard drive?

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#1 Menu Bar

VO keys plus M
The first option you should here is Apple menu. Down arrow into there until you here “About this mac.”
when that window opens go to the tool bar and click on Storage to get all your details about your drive
The basic summery tab will give you info as well.

#2 Another method

Another method is to spotlight search by pressing VO-Space, then searching storage. You should be prompted by a system information window that will tell you what you need to know.

#3 Disk Utility

A third option would be to use the Disk Utility. Navigate to your Applications folder (Command + Shift + A in the Finder), then to the Utilities folder, and open Disk Utility. In the Disk Utility window you will find a table of internal and external drives. If you select your hard drive, the window will reveal information about the total size, current use, and free space on your drive. This is a good place to look if you want to know how much space is available, not just how large the drive is.