Future Value Calculator — lump sum, contributions, and a year-by-year projection

Real-world use cases

• Project a 20-year retirement nest egg

  You are 40 and want a rough picture of where steady saving lands you by 60. Enter your current balance as the starting amount, your monthly contribution as the per-period deposit, set the frequency to monthly, and assume a 6% nominal return over 20 years. The headline future value shows the endpoint, and the year-by-year table shows the curve — the last few years add far more than the first few, which is the whole point of starting early. Toggle ordinary versus annuity-due to see what contributing at the start of each month instead of the end is worth.

• Compare lump sum versus dollar-cost averaging

  You have a bonus to invest and wonder whether to drop it all in now or spread it across the year. Run one projection with the whole amount as the starting present value and zero contributions, then a second with zero present value and the monthly contribution that adds up to the same total. The difference in future value is the cost of waiting — money invested earlier compounds longer. The two numbers make the trade-off concrete instead of a gut call.

• Find the monthly deposit to reach a down-payment goal

  You want $60,000 for a house down payment in five years and already have $10,000 saved. Put $10,000 as the starting amount, set five years and your expected savings rate, then type $60,000 into the target field. The reverse-solve panel tells you the monthly contribution that gets you there. If the number is uncomfortable, lower the target or lengthen the timeline and watch the required deposit drop.

• Size a child's education fund

  A newborn means an 18-year horizon. Enter a modest starting gift, a monthly contribution, and a conservative return, set the frequency to monthly, and read the 18th-year balance. Because the schedule shows cumulative interest separately, you can tell a relative exactly how much of the final fund is their contributions versus growth — a concrete way to show why a small early gift matters more than a larger late one.

• Check whether a fixed annuity offer is fair

  An insurer offers to turn a lump sum into a guaranteed future payout. Enter the lump sum as the present value, the quoted rate, the term, and zero contributions, then compare the calculator's future value to the promised payout. If the tool's number is higher, the offer is crediting you a lower effective rate than the headline — useful leverage before you sign anything.

Common pitfalls

• Entering the rate as a decimal instead of a percent. Type 6 for 6%, not 0.06 — the calculator treats your input as a percent and divides by the compounding frequency itself.

• Forgetting that frequency applies to BOTH compounding and contributions. If you pick monthly, the per-period deposit is what you add each month, not each year. Multiply or divide accordingly when you copy a figure from an annual budget.

• Reading the nominal future value as inflation-adjusted. The result is in future dollars; it does not account for rising prices, so a long-horizon figure overstates real purchasing power unless you discount it separately.

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