Simulation tool with 'If...then' function


I am looking to add a simulation tool to our existing company page.

The simulation tool will ask the user to fill in a few items f.ex. surface of the room, the location of the building, the amount of activities the person performs, etc.

Based on this input the simulator must calculate a certain result.
So different kinds of inputs will always result in a different outcome.

Can anyone guide me to an easy to use, easy to implement anywhere template?

PS: I have little experience is these things, so please bear with me