Just insert the current price, the predicted price and the amount of money you wish to invest so you know exactly how much money you can do.
Example: if you invest 1000$ now with Bitcoin (06.2021, 36k) and in maybe 12 months Bitcoin reaches again 60k, you will earn 666$
THERE ARE SOME ISSUES WITH THE CALCULATOR NOW; WE NEED TO FIND AN ALTERNATIVE
They only works if you click on it.