Barbie, I will tell you what i do , dont know it there is a set formula though.
one and a half teaspoon salt
one teaspoon chilli powder ( if you need more , just add quarter teaspoon more)
Half a teaspoon turmeric powder
3/4 teaspoon garam masala ( in certain recipes)
Thats pretty much it really .. if there are certain spices that you want to know the quantity for , let me know .