Need to embed an active spreadsheet for mobile users

[Aerospace23]

So I built a calculator in google sheets and it works great on a PC only to find it doesn't display as an active sheet at all for mobile.
My site is about 60% mobile users. Can someone direct me to an alternative that would allow both PC and mobile users the ability
to edit? I'm a total novice and have been learning as I go so please be specific.

This is the page rk411.com/calculator

Thanks!
Michael

[Aerospace23]

There are so many places to host a spreadsheet, surely there is free site out there that would work for me...