Future Value Calculator

Future value (FV) is what a sum of money today will be worth at a specified point in the future, given a rate of return. It's one of the cornerstones of finance, expressing a simple but profound idea: money has time value. A dollar today is worth more than a dollar tomorrow, because today's dollar can be invested and grow. Future value quantifies exactly how much it grows.

The calculation has two parts. The first is the future value of a present lump sum: an amount invested today compounds at the chosen rate over time. The second is the future value of a series of regular contributions — an annuity — where each periodic deposit also compounds, with earlier deposits growing longer than later ones. Adding them together gives the total future value of a starting amount plus ongoing savings, which is how most real-world plans actually work.

Three inputs shape the result: the rate of return, the time horizon, and the size and frequency of contributions. Of these, time is the most powerful because compounding is exponential — the growth curve starts gently and steepens dramatically in later years. This is why financial planners stress starting early: a sum invested for 40 years vastly outgrows the same sum invested for 20, even though only the time changed.

Future value is the engine behind countless financial decisions. It tells you whether your current savings rate will reach a retirement target, what a lump sum inheritance could become if invested, how much a regular monthly contribution will accumulate, or whether to take money now versus later. It's also the mirror image of present value, which discounts a future sum back to today's dollars — the two concepts together underpin everything from loan pricing to investment valuation.

A key caveat is that future value assumes a constant rate of return, while real investments fluctuate. The result is best treated as a projection based on an assumed average rate, not a guarantee, and it's wise to test a range of rates. For inflation-adjusted planning, use a 'real' return (nominal return minus inflation) to see future value in today's purchasing power. With those caveats in mind, this calculator gives a clear, quick answer to one of the most useful questions in personal finance: what will this money be worth later?