Compound Interest Calculator

See how your savings can grow over time with compound interest calculated month by month. Enter an initial principal, a monthly contribution, an expected annual return rate, and a time horizon of up to 100 years to project your final balance. The results clearly separate your total contributions from the interest earned so you can visualize exactly how much of your wealth comes from growth versus money you put in. Save and compare multiple scenarios to model different savings rates, investment returns, or retirement timelines.