Formula?

[Shad]

Hello everyone,
Could anybody just make the use of FORMULA/ FORMULAE(S)/ FORMULAS clear to me.
thank you

[rewboss]

Do you mean, which is the correct plural form?

There are two possible correct plural forms for "formula" -- "formulae" (the more traditional form) and "formulas" (the modern one).

I think it probably makes sense to use "formulae" only when talking about mathematical or chemical formulae, and otherwise to use "formulas", but that's just my feeling.