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Future Value Calculator
See what savings will grow to, what a future sum is worth today, and what to save each month to reach a goal.
How future value works
Money that earns interest earns interest on its interest. With a rate i per period and n periods, a lump sum grows by a factor of (1 + i)n. Regular contributions grow the same way, and their total is PMT × ((1 + i)n − 1) ÷ i.
Present value runs the same maths backwards: it divides a future amount by (1 + i)n to say what it is worth today. This is the idea behind discounting in NPV.
Rule of 72 and other shortcuts
To estimate how long money takes to double, divide 72 by the yearly rate. At 6%, money doubles in about 12 years. It is a rough guide that works best for rates between about 4% and 12%.
Starting early matters more than most people expect: the same monthly amount saved for 30 years ends up worth far more than double the amount saved for 15, because the early contributions have longer to compound.
These calculators give estimates for education and planning. They are not financial advice, and real lenders may add fees, taxes, insurance or different rounding. Nothing you type is sent anywhere.