Photoshop Px and Pt text sizes

[hoangvu]

I'm trying to design a cards but I'm having issue with the font size.

My cards is set at resolution to 300 DPI, so my file dimension in Photoshop is 1125 x 675px (including bleeding and cut off space).
When I shrink my image down to a more "actual size" dimension to preview it, the text on my monitor always look fuzzy when I shrink my image size. I'm using the "Sharp" Anti-Aliasing.

On the on the Gill Without MT font,
I'm using 40px for my name, and 25px for contact details.

I researched what is a standard text size to use, and web sites informed me 7-8 in pt.
I'm not sure how to convert PX to PT in Photoshop...

Pls help me........