Hello everyone. I hope someone can help?

I have created a Userform that has 8 input boxes in it. On
the first 4 boxes I tell users to input specific info to
calculate the specified formula from Userform1.

Is there a way to calculate the formula in the same
userform? If not how do I extract the info in boxes 1-4 to
the spreadsheet to add the formula. In the future I want
to hide and unhide parts of the sreadsheet that are not
used so it looks cean and orderly, how do you add this to
the userform functionality?

TIA
Pete