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This is all new to me. I am trying to build an app that is a simple duct sizing program. I have an input field, a button to calculate, but what do I do ford output fields - Do I use a test box for the calculated output? Secondly, the equations are quite simple, I have them written in Excel. What is the best / easiest way to code this in?

Hello Nick,

You can use input component, save its value to localStorage.
Then write code using this value from localStorage, make all calculations and save result to other localStorage variable.

Then back this result to the page.

Here is how to use localStorage http://docs.appery.io/documentation/r...
I recommend you to try some tutorials to learn more about Appery.io possibilities http://docs.appery.io/tutorials/
Also our docs contain useful information http://docs.appery.io/documentation/