Can you please tell me how can I find out the screen resolution and dpi for the screen on my Macbook Pro? (I got it last year, 2009.)
This depends on the model of Macbook Pro (i.e. the screen size - 13.3", 15.4" or 17") you purchased, but the resolution and DPI (or PPI), for the 2009 unibody models, is provided by Wikipedia (here and here).
However, given the resolution and display size, you can easily calculate the PPI. In summary:
MacBook Pro 13.3": 1440x900 (127.68 PPI) MacBook Pro 15.4": 1440x900 (110.27 PPI) MacBook Pro 15.4": 1680x1050 (128 PPI) MacBook Pro 17": 1920x1200 (133.19 PPI)
Open Terminal app and run this command:
system_profiler SPDisplaysDataType. You will see output that looks like this:
$ system_profiler SPDisplaysDataType Graphics/Displays: Intel Iris Graphics 6100: Chipset Model: Intel Iris Graphics 6100 Type: GPU Bus: Built-In VRAM (Dynamic, Max): 1536 MB Vendor: Intel (0x8086) Device ID: 0x162b Revision ID: 0x0009 Displays: Color LCD: Display Type: Retina LCD Resolution: 2560 x 1600 Retina Retina: Yes Pixel Depth: 32-Bit Color (ARGB8888) Main Display: Yes Mirror: Off Online: Yes Built-In: Yes
All these answers are good but the fastest way to find the mac resolution is to do SHIFT + COMMAND + 4 (screenshot shortcut). Move the cursor to the bottom right to get the coordinates.
Press SHIFT + COMMAND + 4 with the cursor in the bottom right corner
Source: Computer Science student at Chapel Hill