Calculate the future value of a present sum of money, plus optional regular monthly contributions, at a given growth rate.
A Future Value Calculator estimates how much a sum of money invested today, or a series of regular contributions, will grow to be worth at a specified point in the future, based on an assumed interest or growth rate. This concept is foundational to financial planning, helping investors understand the long-term impact of compound growth on savings, retirement funds, and other investment goals.
For a single lump-sum investment, Future Value = Present Value × (1 + r)^n, where r is the interest rate per period and n is the number of periods. For a series of regular contributions (an annuity), Future Value = PMT × [((1+r)^n − 1) / r], where PMT is the regular payment amount, reflecting how each contribution compounds for a different length of time depending on when it was made.
Enter your initial investment amount (if any), any regular contribution amount, the expected interest or growth rate, and the number of years or periods until your target date. The calculator returns the projected future value, showing how much your money could grow to under the specified assumptions.
Example 1: A lump-sum investment of 1,00,000 growing at 10% annual interest for 15 years reaches a future value of 1,00,000 × (1.10)^15 ≈ 4,17,725.
Example 2: Regular contributions of 5,000 per month for 15 years (180 months) at a 10% annual rate (approximately 0.83% monthly) grow to roughly 20,80,000, illustrating how consistent contributions combined with compounding can build substantial wealth over time.
Because growth compounds on itself, even a one or two percentage point difference in the assumed rate can lead to a dramatically different final future value over 15, 20, or 30 years, which is why financial projections are often shown across a range of conservative and optimistic rate assumptions.
Future value calculates what a sum of money today will be worth at a later date given a growth rate, while present value works in the opposite direction, calculating what a future sum is worth in today's terms, both are two sides of the same underlying time-value-of-money concept.
While the nominal future value reflects the calculated growth, inflation erodes purchasing power over time, so many financial planners also calculate a real (inflation-adjusted) future value to understand what the money will actually be able to buy at the future date.
Each contribution starts earning its own compound interest from the moment it's deposited, so earlier contributions have more time to grow than later ones, meaning the total future value ends up meaningfully higher than the simple sum of all contributions made.
Retirement planning relies heavily on future value calculations to project how current savings and ongoing contributions will grow by retirement age, helping individuals determine whether their current saving rate is likely to meet their retirement income goals.
More frequent compounding (monthly versus annually, for example) does increase the future value slightly for the same nominal rate, since interest starts earning interest sooner, though the effect is generally smaller than the impact of changing the interest rate itself or the investment time horizon.
Basic future value formulas assume equal periodic contributions, but more advanced projections can model varying contribution amounts over time, such as increasing contributions as income grows, by calculating each contribution's individual future value and summing them together.
Since future value grows exponentially with time due to compounding, money invested early has dramatically more time to grow than money invested later, meaning a smaller amount invested young can often outgrow a larger amount invested just a decade or two later.
Running the same contribution amount and time horizon through different assumed rates of return for various investment types allows a side-by-side comparison of potential outcomes, helping investors understand the trade-off between higher-risk, higher-return options and safer, lower-return alternatives.
The Rule of 72 is a quick mental shortcut for estimating how many years it takes an investment to double, by dividing 72 by the annual growth rate, offering a fast sanity check that complements a more precise future value calculation.
Standard future value formulas calculate pre-tax growth, so for a more realistic projection, investors often separately estimate applicable taxes on gains or interest and adjust the effective growth rate downward to reflect the actual after-tax return.