How much it changes with the timeline
Same goal, same return, different timelines. Your row is highlighted.
| Timeline | Monthly contribution | Total contributed |
|---|
Figures are nominal (not inflation-adjusted) and for illustration only: markets don't deliver constant returns year after year, only on average over the long run — the shorter the timeline, the less you can rely on returns and the more your actual contributions matter (see the historical returns simulator).
What each number means
A quick look at each field and result.
The dollar amount you want to have by the end of the timeline: a down payment, a tuition bill, whatever capital you're after.
How many years you have to reach that figure.
The expected return without adjusting for inflation — unlike other calculators on this site, this one wants the nominal figure because the goal itself is nominal too (a house costs what it costs on the day you buy it).
What you've already set aside for this specific goal, in dollars. It lowers the monthly contribution because it keeps growing too.
The headline result: how much to set aside each month to arrive right on time.
The gap between your goal and what you actually put in (contributions plus what you already had): compound growth working in your favor.
How to fill out this calculator
Steps to calculate your monthly contribution (expand)
- Enter your goal in dollars. It doesn't need to be round: a specific down payment, a specific year's tuition.
- Set the timeline. How many years until you need that money.
- Estimate a conservative nominal return. If you're unsure what figure to use, check the historical returns simulator with real market data.
- Enter what you've already saved for this goal, if anything. Starting from scratch? Leave it at 0.
- Read the resulting monthly contribution and compare it against other timelines in the table: moving the goal a few years earlier or later changes the monthly effort a lot.
Frequently asked questions about this calculator
Why does this calculator use a "nominal" return instead of "real" like others on this site?
Because the goal itself is nominal: the house, the tuition bill, or whatever figure you're chasing is worth what it's worth in the dollars of the day you need it, not in today's dollars. For a very long-term goal (financial independence, retirement) it makes more sense to think in real terms; for a goal with a specific date and figure, nominal is more useful.
What return should I use?
It depends on where that money is invested and how much time you have. For a long timeline (10+ years) in index equities, a 7%–8% nominal return is a reasonable long-run assumption, though no single year looks like the average. For a short timeline, be more conservative — volatility can work against you right when you have the least time to wait it out.
Does this work for a goal 1 or 2 years away?
The math works the same, but the underlying assumption — investing in index equities — isn't prudent over such a short horizon: a market drop right before you need the money could leave you well short of the goal. For goals under 3–5 years out, it's more sensible to save in something stable (a savings account, a CD) and use a very low or zero return here, not an index fund's.
What if I've already saved part of the goal?
Enter it in "Already saved for this": that capital also grows at your assumed return over the full timeline, so it lowers the required monthly contribution by more than it might seem at first glance — it's the same compounding, working on what you already have too.
How does this relate to the compound interest calculator?
It's the same formula, in reverse: compound interest starts from a fixed contribution and asks how much you'll end up with; this one starts from where you want to end up and asks what contribution gets you there.