Well, a little higher mathmatics is all, apparently:
|Students from Sheffield University's Maths Society (SUMS) developed, trialled and tested a formula which enables pancake-lovers to adjust for preferred thickness, griddle size, and number desired. Source.|
And if that's too complex, the lovely students at Sheffield U have produced a handy-dandy calculator. It looks like this:
To use it you'll have to go to the university's website. Note, they're coming from the UK so when they say "pancake" they're thinking crepe-size, not the smaller American type. Bon appetit!