# Input boxes and maths

**URL:** <https://forum.kirupa.com/t/input-boxes-and-maths/33173>\
**Category:** Uncategorized\
**Created:** [October 15, 2003, 11:40pm UTC](https://forum.kirupa.com/t/input-boxes-and-maths/33173 "2003-10-15T23:40:36Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![jimw00d](https://avatars.discourse-cdn.com/v4/letter/j/46a35a/32.png) [@jimw00d](https://forum.kirupa.com/u/jimw00d)\
**Post date:** [October 15, 2003, 11:40pm UTC](https://forum.kirupa.com/t/input-boxes-and-maths/33173/1 "2003-10-15T23:40:36Z")

</div>

What would be the most effective way of performing mathematical functions on data that is entered into input text fields.

I have a client who wanted a method of predicting how many floor tiles would be needed for a floor depending on the square metres of the floor.

A simple width by height calculation would suffice but I seem to have encountered a little trouble.

If I had two input boxes in which to enter a width and a height and a further dynamic box to display the result of the calculation width x height, what sort of Actionscript would I be looking at??

Whenever I try to trace the result to an Output box I get NaN. This is not the answer I wanted. Back to books.

cheers