A BAC calculator like this can be implementend in one page where a user enters the required data and a microflow button that calls a microflow with the calculation. Refresh the object to get the results on screen. For the chart you need some entities in the domain model.

The user can change the data and see the results. A wizard is only needed when many data is asked with dependencies. However if you like to distribute the inputs over multiple page, like a wizard, feel free. It is a UX decision.