Step-by-step guide for setting currency, initial investment, contribution amount, rate, duration, target amount, and exporting CSV data.
- Choose a currency and enter the starting amount before adding recurring contributions.
- Select the period type carefully because daily, monthly, and yearly rates mean different assumptions.
- Use the target calculator and CSV export to review the plan outside the browser.
Setting up your first scenario
Start by choosing your currency so every figure is labeled correctly, then enter the initial investment, which is the amount you already have to put in today. If you are starting from zero, leave it at zero and rely on contributions. Next enter your recurring contribution and pick the matching period, since a number entered as monthly behaves very differently from the same number entered as yearly.
Enter the expected return and the duration last. A practical first scenario for a long-term investor might be a $5,000 initial investment, a $300 monthly contribution, a 7% annual return, and a 20-year horizon. With those inputs the calculator immediately shows the projected balance, how much of it you contributed, and how much came from growth, giving you a baseline to adjust from.
Reading the chart, table, and goal tools
The summary cards give the headline numbers; the chart shows the balance climbing over time, with the gap between contributed principal and total balance widening as interest accumulates. Hovering or scanning the breakdown table reveals the exact moment growth begins to outpace your deposits, which is often a motivating milestone. The goal calculator works the other way around: tell it a target amount and it estimates how long your current settings need to reach it.
Once a scenario looks reasonable, use the CSV export to save the full schedule. Opening it in a spreadsheet lets you keep a record, build your own charts, or compare several exported scenarios side by side outside the browser. Nothing is uploaded; the file is generated locally from the numbers already on screen.
Getting useful answers, not just numbers
The most effective way to use the tool is to change one input at a time. Hold everything constant and raise only the monthly contribution to see how much saving more is worth; then reset and raise only the return to compare. Isolating each variable turns a single projection into a genuine understanding of which levers move your outcome the most, and it usually reveals that consistent contributions and a long horizon do more reliable work than an optimistic rate.
Finally, stress-test the plan. Re-run your scenario with a return two or three points lower to see how it holds up in a weaker market. A plan that still reaches roughly your goal under a conservative assumption is far sturdier than one that only works if returns are excellent. The calculator makes this comparison quick, which is its real value as a planning aid rather than a predictor.
Frequently asked questions
What numbers do I need to enter?
You need a starting amount, a recurring contribution and its period, an expected annual return, and a time horizon. Optionally you can set a target amount to use the goal calculator. Everything else is computed for you.
Why do daily, monthly, and yearly periods give different results?
They change how often interest is compounded and how often contributions are added. More frequent periods credit growth sooner, producing a slightly larger balance. Always make sure the rate you enter matches the period you intend.
How does the goal calculator work?
You enter a target balance, and the tool estimates how long your current initial amount, contribution, and return assumption need to reach it. It is a quick way to see whether a goal is realistic or needs higher contributions.
Can I save or export my results?
Yes. The CSV export downloads the full period-by-period schedule to your device so you can open it in a spreadsheet, keep a record, or compare scenarios. The file is generated locally and nothing is uploaded.