Yeah obviously, I know that. But at what ratio?
And also, I don't intend to use magic that much.
There really is no set ratio, as it varies according to play style. Those who go 2H+Light Armor want more Stamina, as you do a lot of Sprint-Kiting to avoid getting your head split until you get your armor rating high, while those who go Heavy Armor don't need it as much as the idea is to stand and tank.
I typically stop at 200 Stamina, but then I tend to use the perk from Restoration that lets you heal Stamina along with Health, as well as a sword with an Absorb Stamina enchantment on it, so don't need a huge reserve of the stuff. Those doing a more 'pure' warrior-type build would want more stamina, since they're not using those things and will run out on a regular basis if they leave it low.