Hi
There are two parts to this question.

1.
Is there any way I can make it so that only a numeric
value (preferrably within certain limits) can be entered
into a textbox?

2.
If the above is possible, then I have 3 textboxes which
are used to perform a calculation, the results of which
will be displayed in a label.
I know what the formula is on an excel sheet, using the
functions Average() and trunc(), but how would I code this
in vba?

Any help much appreciated