How this works
This compounds your money period by period based on the frequency you choose (monthly, quarterly, yearly) and adds any regular contribution on top — the more often interest compounds, the faster it grows for the same annual rate, since each period's interest starts earning its own interest sooner.
Common questions
Does compounding frequency actually make a big difference?
Less than most people expect for typical rates and periods — going from yearly to monthly compounding on an 8% rate over 10 years changes the result by a few percent, not a dramatic amount. The contribution amount and time horizon usually matter far more.
What's the difference between this and the Investment Calculator?
They use the same underlying math — this one is framed as a general compound-interest tool for any principal and contribution, while Investment Calculator is framed around planning toward a specific goal.