📈 Future Value Calculator
By ToolNimba Finance Team · Reviewed by ToolNimba Editorial Review, personal finance content · Updated 2026-06-19
This calculator gives an estimate based on a single constant rate and regular compounding. Real returns vary year to year, and inflation, taxes, fees and contribution timing all change the outcome. The result is a projection, not a guarantee or financial advice. Confirm assumptions and speak to a qualified adviser before making investment decisions.
A future value calculator shows what a sum of money, or a stream of regular contributions, could grow to by a chosen date once compound interest is applied. Enter your present value, the annual rate, the number of years, how often interest compounds, and an optional periodic contribution. You instantly see the projected future value, how much you actually put in (your total contributions), and how much of the balance is interest. It is the quickest way to put the time value of money to work for a savings or investment plan.
What is the Future Value Calculator?
Future value (FV) is the core idea behind the time value of money: a dollar today is worth more than a dollar tomorrow, because today's dollar can be invested and earn a return. Compounding is what makes the gap widen over time. When interest is added to your balance, that interest then earns interest of its own, so growth accelerates the longer the money stays invested. A future value calculator simply rolls this process forward across every compounding period to a single end figure.
The calculation has two parts. The first is the growth of your starting lump sum: PV x (1 + r/n)^(n x t), where r is the annual rate as a decimal, n is the number of compounds per year, and t is the number of years. The second part is the growth of your regular contributions, known as the future value of an annuity. Each contribution is invested for a different length of time, so the closer to the end you add money, the less it compounds. The formula PMT x (((1 + r/n)^(n x t) - 1) / (r/n)) sums all of those individual growth amounts into one figure, then adds it to the grown lump sum.
Reading the three outputs together is what makes this useful. Total contributions is the plain money you supplied: your present value plus every periodic payment. Future value is what those contributions are projected to be worth. The difference between them is the interest, the part the market or the bank added on top. Over long horizons the interest can dwarf the contributions, which is the visible payoff of starting early and leaving money to compound.
When to use it
- Projecting what a retirement account or index fund could be worth after 10, 20 or 30 years of monthly contributions.
- Estimating how a fixed deposit or savings bond will grow to maturity at a known compounding frequency.
- Comparing a one-time lump sum against a smaller amount paid in regularly to see which reaches a goal sooner.
- Setting a savings target by working out the future value of the amount you can realistically set aside each month.
How to use the Future Value Calculator
- Enter your present value, the starting amount you already have invested (use 0 if you are starting from scratch).
- Enter the annual interest or growth rate as a percentage.
- Enter the number of years the money will grow.
- Choose how many times per year interest compounds.
- Optionally enter a periodic contribution and choose whether it is added at the start or end of each period.
- Read off the future value, your total contributions, and the total interest earned.
Formula & method
Worked examples
You invest a $10,000 lump sum at 6% annual, compounded monthly, for 10 years, with no extra contributions.
- Periodic rate i = r/n = 0.06 ÷ 12 = 0.0050000
- Number of periods n x t = 12 × 10 = 120
- Growth factor (1 + i)^120 = 1.0050000^120 = 1.819397
- FV = 10,000 × 1.819397 = 18,193.97
- Total contributions = 10,000 (no periodic payments)
- Total interest = 18,193.97 − 10,000 = 8,193.97
Result: Future value ≈ $18,193.97 · Contributions $10,000 · Interest ≈ $8,193.97
You start with $5,000 and add $200 at the end of every month at 7% annual, compounded monthly, for 20 years.
- Periodic rate i = 0.07 ÷ 12 = 0.0058333
- Number of periods = 12 × 20 = 240
- Growth factor (1 + i)^240 = 4.038739
- Lump-sum part = 5,000 × 4.038739 = 20,193.69
- Annuity part = 200 × ((4.038739 − 1) ÷ 0.0058333) = 200 × 520.9267 = 104,185.33
- FV = 20,193.69 + 104,185.33 = 124,379.03
- Total contributions = 5,000 + 200 × 240 = 53,000
- Total interest = 124,379.03 − 53,000 = 71,379.03
Result: Future value ≈ $124,379.03 · Contributions $53,000 · Interest ≈ $71,379.03
Future value of a $1,000 lump sum at 5% annual, compounded annually
| Years | Growth factor | Future value | Interest |
|---|---|---|---|
| 5 years | 1.276282 | $1,276.28 | $276.28 |
| 10 years | 1.628895 | $1,628.89 | $628.89 |
| 20 years | 2.653298 | $2,653.30 | $1,653.30 |
| 30 years | 4.321942 | $4,321.94 | $3,321.94 |
How compounding frequency affects $10,000 at 6% over 10 years
| Frequency | n per year | Future value |
|---|---|---|
| Annually | 1 | $17,908.48 |
| Quarterly | 4 | $18,140.18 |
| Monthly | 12 | $18,193.97 |
| Daily | 365 | $18,220.29 |
Common mistakes to avoid
- Confusing the rate per period with the annual rate. The formula uses r/n, the rate per compounding period, not the full annual rate. Plugging the annual rate straight into the power term overstates growth badly. This tool divides for you, but check it when computing by hand.
- Ignoring contribution timing. Contributions added at the start of each period (an annuity due) earn one extra period of interest each, so they grow slightly more than end-of-period payments. Over decades that small difference adds up, so pick the timing that matches your real deposits.
- Treating nominal future value as real purchasing power. A future value is in future dollars. Inflation erodes what those dollars buy, so a balance that looks large in 30 years may be worth far less in today’s terms. To compare, discount the result by an expected inflation rate.
- Forgetting taxes and fees. The raw future value assumes the full rate is earned and kept. Account fees, fund expense ratios and taxes on interest or gains all reduce the effective rate, so real-world balances usually land below the headline projection.
Glossary
- Future value (FV)
- What a present sum or stream of payments is projected to be worth at a future date once interest compounds.
- Present value (PV)
- The amount you have today, before any future growth is applied.
- Compounding frequency (n)
- How many times per year interest is calculated and added to the balance, for example 12 for monthly.
- Periodic contribution (PMT)
- A fixed amount you add each period, such as a monthly deposit into a savings or investment account.
- Annuity due
- A series of payments made at the start of each period, which earns one extra period of interest versus an ordinary annuity.
- Time value of money
- The principle that money available now is worth more than the same amount later, because it can earn a return in the meantime.
Frequently asked questions
What is future value?
Future value is the projected worth of money at a later date once compound interest has been applied. It answers the question, if I invest this amount at this rate for this long, how much will I have? The calculator works it out from your present value, rate, time, compounding frequency and any regular contributions.
What is the future value formula?
For a lump sum plus regular contributions it is FV = PV x (1 + r/n)^(n x t) + PMT x (((1 + r/n)^(n x t) - 1) / (r/n)). PV is the present value, r is the annual rate as a decimal, n is compounds per year, t is years, and PMT is the payment per period.
How does compounding frequency change the result?
More frequent compounding means interest is added sooner and starts earning its own interest, so the future value rises slightly as you move from annual to monthly to daily compounding. The effect is real but modest at typical rates, as the reference table on this page shows.
What is the difference between future value and present value?
Present value is what an amount is worth today; future value is what it grows into by a later date. They are two sides of the time value of money. Compounding moves a present value forward to a future value, and discounting brings a future value back to a present value.
Does this account for inflation?
No. The result is a nominal future value in future dollars. To see what it is worth in today’s purchasing power, discount the figure by an expected inflation rate, or enter a real (inflation-adjusted) rate of return instead of the nominal rate.
Should contributions be at the start or end of each period?
It depends on when you actually deposit. End of period (an ordinary annuity) is the common default. Start of period (an annuity due) gives each contribution one extra period of growth, so the future value is a little higher. Choose the option that matches your real schedule.
Sources
- Future Value (FV) , Investopedia
- Compound interest , U.S. Securities and Exchange Commission (Investor.gov)