Track progress toward multiple savings goals with visual progress bars, contribution schedules, and target date projections.
A savings goal is really two numbers: the amount and the date. This tracker holds several goals at once - an emergency fund, a vacation, a down payment - each with its own progress bar, contribution schedule, and projected finish date. Enter what you need, what you already have, a monthly contribution, and an interest rate; the balance grows with monthly compounding, the progress bar re-draws, and a target date appears. The surprise most users hit: the projected date lands earlier than dividing the remaining gap by the monthly amount, because the contributions themselves earn interest along the way.
A concrete input and expected output from the current implementation.
Input
Goal: $6,000. Already saved: $2,000. Monthly contribution: $100. Interest: 0% APY.
Expected output
Progress 33%: $2,000 of $6,000 saved. Remaining: $4,000. At $100 a month that is 40 months - completion projected 3 years and 4 months from today, with the final month needing the full $100 (the balance lands exactly on the goal).
With a 0% rate the math is plain division, so the $4,000 gap at $100 a month is exactly 40 months, and 39 months of contributions leave $100 to go. Enter a non-zero APY and the projection shortens, because monthly compounding means the balance and the contributions themselves earn interest.
Each month, the saved balance earns one-twelfth of the annual rate, and the contribution is added at month's end, so interest is paid on interest and on the contributions themselves. The finish date is the month the balance crosses the goal amount. On a multi-year goal, a modest rate like 4% APY typically pulls the date forward by several months compared with no-interest division.
Each goal carries its own recurring monthly amount rather than a single deposit, so the tracker can answer schedule questions: what happens to the finish date if you raise the amount by $50, skip a month, or make a lump-sum deposit? Every change re-projects from the current balance, and the progress bar shows whether you are ahead of or behind the steady pace needed to finish on time.
Most back-of-envelope math ignores interest entirely: divide the gap by the monthly amount and count months. The tracker compounds the balance monthly, and because contributions earn interest too, the crossing month comes earlier - often several months sooner on a multi-year goal at even 3-4% APY.
The projection always runs from the current balance and whatever schedule is entered. A missed month pushes the date later; a higher contribution or a lump sum pulls it earlier. The shift is never a plain trade, because interest is also lost or gained on the amounts in between.
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