The Future Value Investment Calculator projects how a starting investment grows over time at an expected annual return, then shows both the nominal ending balance and a real, inflation-adjusted version of that same balance side by side. Enter a starting amount, an expected annual return, a number of years and an assumed inflation rate, and the calculator returns both figures.
Most investment growth projections stop at the nominal number, the raw dollar figure an account is expected to reach. That number alone can overstate what the money will actually be able to buy later, since prices tend to rise over the same period the investment is growing. This calculator keeps both perspectives visible together.
*These results are estimates for information only, not investment advice.*
Project nominal investment growth
Nominal growth uses the standard compound growth formula: Future Value = Present Value x (1 + r)^t, where r is the expected annual return and t is the number of years, compounded once per year in this model. Take a $10,000 starting investment with an expected 7% annual return over 20 years.
Running those numbers through the formula produces a nominal ending balance of approximately $38,696.84, meaning the investment is projected to grow nearly fourfold in raw dollar terms over two decades.
The Future Value Investment Calculator computes this nominal figure first, since it is the straightforward answer to "what will this investment be worth" before adjusting for anything else.
See the real, inflation-adjusted version of the same growth
Alongside the nominal figure, this calculator computes a real growth rate using the Fisher relationship: Real Rate = (1 + Nominal Rate) / (1 + Inflation Rate) - 1.
At a 7% expected return and a 3% assumed inflation rate, the real rate works out to approximately 3.8835%, noticeably lower than the 7% headline figure, since inflation is eating into a meaningful portion of the nominal gain.
Applying that real rate to the same $10,000 starting investment over the same 20 years produces a real ending balance of approximately $21,425.50, in today's purchasing power terms, considerably smaller than the $38,696.84 nominal figure. The gap between the two, roughly $17,271.34, represents the purchasing power the nominal growth figure alone would have overstated.
Understand why both numbers matter
The nominal figure answers what an account statement will actually show; the real figure answers what that statement's balance will actually be able to buy, in terms of today's prices.
Both are useful depending on the question being asked: nominal for tracking an account's raw dollar growth, real for understanding whether an investment strategy is genuinely building purchasing power or merely keeping pace with, or falling behind, rising prices.
A 7% nominal return during a period of 3% inflation is still meaningfully ahead of inflation, since the real rate of 3.8835% remains solidly positive, but the gap between the two figures shown side by side makes clear just how much of the headline return is being absorbed by rising prices rather than translating into greater real wealth.
See how the assumed inflation rate changes the real outcome
Raising the assumed inflation rate lowers the real rate and therefore the real ending balance, while leaving the nominal figure completely unchanged, since inflation does not affect the nominal growth calculation at all, only the conversion to real terms.
Testing a range of plausible inflation assumptions against the same nominal return and time horizon shows how sensitive the real outcome is to that single assumption, which is useful given that actual future inflation is inherently uncertain.
Know what this calculation assumes
This calculation assumes a constant expected annual return and a constant inflation rate held steady for the entire period, with annual compounding and no additional contributions, fees or taxes affecting the balance.
Real investment returns fluctuate year to year rather than compounding at one steady rate, and actual inflation varies over time as well, so both figures here are simplified planning estimates rather than guaranteed outcomes.
Use the Future Value Investment Calculator to compare nominal and real growth expectations under a chosen set of assumptions, and revisit those assumptions periodically as actual returns and inflation data become available.
Frequently asked questions
What is the difference between nominal and real investment growth?
Nominal growth is the raw dollar figure an investment is projected to reach; real growth adjusts that figure for inflation to show what the ending balance would be worth in today's purchasing power, which is typically a smaller number than the nominal figure.
How much does $10,000 grow to at a 7% return over 20 years?
A $10,000 investment growing at a 7% annual return over 20 years reaches a nominal future value of approximately $38,696.84, before any adjustment for inflation.
What is the real, inflation-adjusted value of that same growth?
Adjusting the 7% nominal return for an assumed 3% inflation rate gives a real rate of approximately 3.8835%, which applied to the same $10,000 over 20 years produces a real ending balance of approximately $21,425.50 in today's purchasing power.
How is the real rate of return calculated?
The real rate of return is calculated using the Fisher relationship, Real Rate = (1 + Nominal Rate) / (1 + Inflation Rate) - 1, which adjusts a nominal return for the erosive effect of inflation over the same period.
Does a higher assumed inflation rate change the nominal figure?
No, a higher assumed inflation rate only changes the real, inflation-adjusted figure. The nominal future value calculation is unaffected by the inflation assumption, since it depends only on the starting amount, the expected return and the number of years.
Summary
The Future Value Investment Calculator projects nominal investment growth using Future Value = Present Value x (1 + r)^t, then converts that figure to a real, inflation-adjusted equivalent using the Fisher relationship.
A $10,000 investment at a 7% expected return over 20 years reaches a nominal $38,696.84, but only about $21,425.50 in real, inflation-adjusted terms once a 3% inflation assumption is applied.
Comparing both figures shows how much of a headline return is genuine purchasing-power growth versus inflation erosion. Figures shown are estimates, not investment advice.