Yes Wappler can do what you need. You don’t necessarily need a background in web design or development, but do expect there to be a learning curve - and that you’ll have to dive in a little to understand what you’re trying to do.
I presume that calculator is this one: https://pizza-dough-calculator.herokuapp.com/calculator
That form updates in realtime. Wappler can do that.
I just made this quick video making a quick form that does calculations like that in real time. And notice, I haven’t ever done that before in Wappler, but I was able to find it out quickly. Notice I forgot to add the App Framework and made a mistake on how to update the third field, and it didn’t slow me down at all. Very fast.
2018-09-01_11-53-36.mp4 (19.3 MB)