layout – "Translate" the dimensions of the desktop mobile app mockup to the size of the smartphone?

I'm sure this is a common problem, but I'm not sure I can explain it correctly. Stay with me.

I have included a screenshot of a mobile application that I am working on in my Windows 10 PC. For the sake of argument, let's say I created it in MS Paint.

As you can see, Paint the font is 48 pt and the text area is 580 px wide. On the other hand, if I send this "drawing" by email to my iphone and watch the drawing from the phone, the picture is perfect. I know the image is resized in the phone.

On the other hand, I sent this same image to the developer, and the font in the app he deployed (in my ihpone 7) is too big, but I don't know not what size I should tell him. The same goes for other orders. I guess he is using an iphone plus, while I have a normal iphone. I guess Android will have the same problems.

My question, how do I tell the developer when he asks me the font size and the control size? I can't tell her that the font is 48 points since I guess it will be too big for the iphone.

In other words, how do I "translate" the sizes of my Windows 10 PC into sizes that would fit a smartphone?

The reason I ask is because I sent a developer a mockup of a screen I created in FireWorks to a developer, but the font sizes are very different. So I have to tell him the specific font sizes, but I don't know what those sizes are.

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