Savings Goal Calculator

Most savings math runs forwards: put money in, watch it grow, see where it lands. A goal with a date on it needs the math run the other way. You know the target, a house deposit, a vehicle, a year of expenses, and you know the deadline. The unknown is the monthly deposit that connects what you have today to that target on that date. This calculator solves for that unknown directly.

The solver does it in two steps. First, it grows your current savings forward to the goal date at the return you assumed. Money already saved is the hardest-working money in the plan, because it compounds for the full timeline. Second, it measures the gap between that projected amount and your goal, then solves for the level monthly deposit, paid at the end of each month, that fills the gap by the deadline. The result is the deposit the plan actually requires, which is often different from the deposit that merely feels reasonable.

The calculator also runs your current deposit forward, if you enter one, and places it beside the goal. That comparison is the part savers most often skip. A deposit can feel steady and still land well short, as the worked example below shows: a hypothetical $400 a month finishes more than $16,000 behind a $60,000 goal that needs about $600 a month. Seeing the shortfall as a number, years before the deadline, is what makes it fixable.

It is tempting to treat the return as a minor input and the deposit as the real lever. Over long horizons the relationship runs the other way, and the worked example shows why. Hold the goal, the starting savings, and the six-year timeline fixed, and move only the assumed return. At a hypothetical 2.5 percent, the required deposit is about $653 a month. At 4.5 percent it is $600.45. At a hypothetical 6.5 percent it falls to about $549. The assumption alone swings the required deposit by roughly $105 a month, with no change to the saver’s behaviour at all.

Compare that with a deposit change. Adding $50 a month at the 4.5 percent assumption adds about $4,124 to the ending balance over the six years. That is real money, and it matters. But notice what each lever acts on. A deposit change adds one new stream of cash that compounds only from the month each payment lands. The return acts on everything: the starting balance from month one, and every deposit for every month it sits in the account. The longer the horizon, the larger the balance the return is working on, and the more the assumption dominates. Over twenty or thirty years, a one-point difference in the assumed return moves the required deposit far more than the $105 a month seen in this six-year example.

The honest conclusion is not to assume a high return. It is the opposite. Because the plan is this sensitive to a number nobody can promise, solve for the deposit at a cautious return, then treat anything above it as a cushion. If the required deposit only fits your budget at an optimistic return, the plan is fragile, and the better moves are a later goal date or a smaller goal, decided now while they are still cheap.

Where the money sits decides which return assumption is even plausible. Cash in a savings account earns the account yield, and yields differ enough between accounts to change the required deposit on their own. If you are choosing between accounts for this goal, the high yield savings calculator prices that rate gap on the same deposits and timeline, so you can see what a better yield is worth in dollars before you solve for the deposit here. Invested money can aim higher, but its return arrives unevenly, which is why this solver asks you to type the assumption yourself rather than filling one in for you.

The required deposit is a floor, not a suggestion. It is the exact level deposit that lands on the target under the return you assumed. Deposit less, or earn less, and the goal date arrives short. Build the automatic deposit at or slightly above the required figure so ordinary drift works in your favour.

A shortfall is information, not failure. The projected total beside your current deposit exists so you can see the gap years early. Closing it gets cheaper the sooner you act, because every added dollar gets more months of compounding. A $50 increase made today is worth more than a $100 increase made in the final year.

Re-solve when life changes. A raise, a paused deposit, a changed goal date, or a different account yield all move the answer. Re-run the solver when any input changes and at least once a year. The plan that stays on track is the one that gets recalculated, not the one that was perfect on the day it was made.

Mind the assumptions. Every figure on this page rests on monthly compounding, deposits at the end of each month, and the single annual return you entered, held steady for the whole timeline. Real returns vary month to month, and the order they arrive in affects invested money. Treat the output as a planning target to steer by, and keep the return assumption cautious enough that a mediocre stretch does not break the goal.