Investment Calculator
Project the future value of an investment from an initial amount, recurring monthly contributions, annual return rate, and time horizon — with total contributed and total growth broken out.
How It Works
The initial amount compounds at the annual return rate, converted to a monthly rate by dividing by 12. Each month the balance grows by (balance × monthly rate), which is the standard monthly compounding model.
Monthly contributions are treated as made at the end of each month (an ordinary annuity). Each contribution then compounds from the month it is made until the end of the time horizon.
Total contributed is your initial amount plus every monthly contribution over the horizon. Total growth is the final balance minus total contributed — the portion of your balance that came from investment returns rather than from money you put in.