Hi Ginkle,
I can’t tell why Excel is auto calculating without more info. What were you originally trying to calculate?
Also, I would need to see what formulas you’re using. Could you submit a screen shot with formulas displayed?

HOW TO DISPLAY FORMULAS:
Press CTRL + ` (grave accent).
To switch back to hidden formulas: Press CTRL + ` (grave accent) again.

Fortunately, Excel is easy to work with, so it should be a simple fix

Hi Ginkle,
It probably would be easier if I could actually see your original Excel worksheet. Fortunately, you can attach your entire Excel document to a forum post.

To attach a file to a new post, simply click the MANAGE ATTACHMENTS button at the bottom of your Reply (DON’T use Quick Reply.)
Locate the file that you want to attach from your local hard drive, & upload it.

Don’t forget to include a description of exactly what you were trying to calculate in the first place. If you feel it’s too much to get into in a forum post, write it all out in a (saved) Word document. Then upload that as well.

This sounds like home work for summer school...

in cell A1 put your number
in cell A2 put =a1*.0028
in cell a3 put =a2*.017
etc

When you type = it sets itself as a formula, if you click the cell you want, i.e. A1 it'll put it into thde formula, then fisish typing your formula.

Here, youtube it
Excel 2010: Simple Formulas - YouTube