What is the corner radius of the windows in Mac OS X? I kind of like to have stuff right on the dot and it'll bug me until I find out.

2 Answers 2


From a hand-made measurement, the corner radius seems to be 7px. Plus 1 px, if you include the left drop shadow:

enter image description here


Nowadays it seems to be more like 5px.

The black around the window (I used a Finder.app window for that, to ensure that I have a native one) is the rim shadow from Mojave's dark mode which makes for a pretty good guideline for the orange border I placed.

I experimented with 4px and 6px, but 5px seems to hit the mark best.

enter image description here

  • 1
    Hi Ubuntudroid, do you have a source for that? you can edit your answer to add more info. Also, feel free to stick around, answer more questions and maybe ask a question of your own.
    – PieBie
    Sep 24, 2018 at 8:04
  • Hi @PieBie, just tried it out manually by trying to put a rounded rectangle around some windows. 4px radius worked best for all the windows I tried. Sep 24, 2018 at 8:55
  • 1
    Could you maybe add a screenshot of that, like Yisela did?
    – PieBie
    Sep 24, 2018 at 9:02
  • 1
    @PieBie done, also changed my response to 5px as this seems to be closer to reality. Sep 26, 2018 at 16:39

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