[stgr]

It would be nice to have a pixel calculator to determine the number of pixels for the images to render. For example I want to end up with an image for A3 size and 300 dpi/ppi.

And x, y, z characters at the axis in viewport would be nice.

[Ha_Loe]

This site here is in german but I'm sure there are loads of other in whatever language suits you.
http://www.din-formate.de/din-a-reihe-b ... pi-cm.html

[JamesColeman]

FWIW, I use Photoshop for any calculations like that.

[Fernando Tella]

I use a pencil and a calculator.

Photoshop is faster though.

[Sebastien Bernard]

Yes photoshop is the best way...

[stgr]

I know about all that possibilities! For me to have this option in Maxwell would be more efficient.

[choo-chee]

this is the fastest way: don't render less than about 3000X2000 and usually it would be better to render big and resample down (5000X3750 --> 4000X3000 etc.)
dpi is not important as we all know. only as much pixelsXpixels at high SL.