What will it grow to?
The rate matters more than it looks
Cash sitting in a current account earning almost nothing is the most common version of this. The difference between 0.1% and 4% does not sound like much for one year, but it compounds: the gap widens every year because the interest itself starts earning.
The line showing what you put in is the honest one. Over short periods almost all of the balance is your own deposits, and the interest only starts to dominate after a decade or more.
What this leaves out
It compounds monthly and assumes the rate holds for the whole period, which no savings rate does. Tax on interest is not deducted, and inflation is not taken off, so the balance is in future dollars rather than today's buying power. It is arithmetic on the numbers you enter, not a forecast, and it is not investment advice.