How do I find out app file size

I only have 1.7gb left on my 8gb phone and notice that an app I am considering is 1.3 gb. How do I find the file size of apps before I buy them so I don't pay for something and then find out that I don't have enough space?
Thanks!

I mean if I download this file and am left with only 0.4gb and want to download more apps in the future. Or if I HAD only 0.4gb left and needed to remove apps to make room, how do I know how large the are?
Thanks!

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How do I find out app file size

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