Investment Calculator (USA)
Estimate how an investment may grow over time using an initial amount, recurring contributions, compound return, and optional inflation adjustment.
Inputs
Starting point
Growth assumptions
Optional real-value view
Results
Future value
$0
Total contributions
$0
Investment gains
$0
Inflation-adjusted value
$0
| Component | Amount | Note |
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Portfolio growth over time
Projected year-by-year growth based on your assumptions.
Contributions vs gains
See how much comes from contributions versus investment growth.
How to use
- Enter your starting investment, monthly contribution, expected annual return, and time horizon.
- Choose the compounding frequency and whether contributions happen at the beginning or end of the month.
- Add optional inflation and annual extra contributions if you want a more realistic long-term planning view.
- Click Calculate to see projected future value, contributions, gains, and a chart of growth over time.
If you want a Canadian version for similar growth planning, use the Investment Growth Calculator (Canada) or the TFSA Growth Estimator (Canada). If you’re trying to fit investing into a broader spending plan, the 50/30/20 Budget Calculator (USA) can help structure monthly cash flow.
Investment calculator (USA): estimate future value, contributions, and gains
An investment calculator helps answer one of the most important long-term money questions: what might this account be worth in the future if I invest consistently? Even a simple projection can be useful when you want to compare scenarios, set realistic expectations, and understand the difference between money you contribute and money that comes from growth.
This calculator estimates future value using a starting amount, recurring monthly contributions, an expected annual return, a time horizon, and optional annual extra contributions. It also shows an inflation-adjusted value so you can compare the nominal future number with a rough real-value estimate. That makes the result more useful for planning, because a large future balance may look very different once inflation is considered.
This is still a projection, not a forecast. Real returns are uneven, investment fees matter, taxes can matter depending on account type, and markets do not grow in a straight line. But the tool is very helpful for planning behavior: how much more could you end up with if you increase contributions, invest earlier, or stay invested longer? If you want to fit investing into a monthly framework, pair this with the 50/30/20 Budget Calculator (USA).
FAQ
No. This is a projection based on fixed assumptions. Real investment returns vary and can be positive or negative.
Money contributed earlier has slightly more time to compound, so beginning-of-month contributions typically produce a slightly higher future value.
It’s a rough estimate of future value in today’s purchasing-power terms, after adjusting for assumed inflation.
It’s often better to test a range of assumptions rather than rely on a single optimistic number. That gives a more realistic planning range.