Savings Goal Calculator

First, your current savings are projected forward to the target date at the given rate, compounded monthly. If that alone covers the goal, no further deposits are needed. Otherwise, the remaining gap is solved for using the future-value-of-an-annuity formula, which finds the fixed monthly deposit whose compounded contributions exactly fill that gap by the deadline.

The chart below re-traces that same path month by month, showing how much of the balance at each point is money you put in versus interest earned — the final bar lands exactly on your goal amount.