Trying to figure out the right pixel dimensions to convert to 360dpi for print

[winterludes]

Hi,

I'm trying to use Adobe Express to make some 4x5, 8x10, and one larger size cards with written words, and Adobe Express is just a lot easier ot make cards like this than Photoshop.  But Express will only allow 72dpi stupidly, and I can't figure out what the pixel dimensions should be for say the 8x10 card, which I want to eventually be 8x10" @360dpi 

Could anyone help me with a way of figuring this out?  

an 8x10 @360dpi is 2880x3600 pixels.  But if I start with those pixel dimensions, than when I change the image to 360dpi in photoshop, the image will become smaller.  And I can't find a way to calculate the right dimensions to start with .  

Maybe I'm missing something.  

Thank you!

[winterludes · Accepted solution]

This turned out to be easy, I guess Adobe Express updated the app while still leavign some old documentation online.  If you make a project in inches rather than in pixels, it's automatically 300dpi.  I'd rather it be 360dpi but most commercal printers want 300 anyways.  

Thanks