Find out how much your savings or investment could be worth in the future with a starting balance, monthly deposits, an expected annual return, and an investment period. The Future Value Calculator estimates your ending balance by combining the money you put in with the growth that may accumulate over time.
Whether you are building an emergency fund, saving for a major purchase, or estimating long-term investment growth, the calculation helps you see how your starting amount, regular contributions, and assumed return affect the result.
Enter your figures to see your projected future value, total deposits, compound interest earned, and growth multiplier. Remember that this is an estimate based on your assumptions, not a guaranteed investment outcome.
What Does the Future Value Calculator Calculate?
Future value (FV) is the estimated amount an investment or savings balance may reach at a specified point in the future. It includes the original amount invested and any growth earned under the assumed interest rate and compounding method.
This calculator accounts for two sources of money:
- Starting amount: The lump sum you already have invested or saved.
- Monthly deposits: Additional money you plan to contribute throughout the investment period.
It combines the projected growth of both amounts to estimate your ending balance.
The results also separate your contributions from the growth generated by the calculation. This distinction matters because an account balance can increase simply because you keep depositing money, even before considering investment returns.
Understanding your future value results
Future Value (FV)
This is your projected balance at the end of the selected period. It includes the starting amount, your monthly deposits, and the growth calculated using the assumed rate.
Total Deposits
This represents the money you contribute yourself: the starting amount plus all scheduled monthly deposits. It does not include investment growth.
Compound Interest Earned
This is the difference between the projected future value and your total deposits, assuming the calculator does not account for fees, taxes, withdrawals, or other adjustments.
Growth Multiplier
The growth multiplier compares the projected ending balance with the total amount contributed. For example, a multiplier of 1.50x means the projected balance is 1.5 times your total deposits. It does not mean your investment earned a 150% profit.
How to Use the Future Value Calculator
You only need four inputs to estimate how your savings or investment may grow.
- Enter your starting amount. This is the money you already have available to invest. For example, enter $10,000 if that is your initial balance.
- Add your monthly deposit. Enter how much you expect to contribute each month. If you plan to invest only a lump sum and make no further contributions, enter zero.
- Enter the annual interest rate. Use the annual rate you want to model. For an investment, this is an assumed return rather than a guaranteed rate.
- Choose the investment period. Enter the number of years you expect to leave the money invested.
The calculator then estimates your future value and displays the total deposits, compound interest earned, and growth multiplier.
For a meaningful comparison, change one input at a time. For example, calculate your projected balance at 5% and then at 7%, keeping your starting amount, monthly deposit, and investment period unchanged. This shows how the assumed rate affects the result without mixing it up with the effect of additional contributions.
How Is Future Value Calculated?
The future value calculation accounts for how the starting amount grows and how each monthly deposit accumulates over time.
The starting amount has the entire investment period to grow. Monthly deposits enter at different times, so the earliest deposits have more time to accumulate growth than those made near the end.
For a calculation using monthly compounding and end-of-month deposits, the total future value can be expressed as:
[
FV=PV(1+i)^n+PMT\frac{(1+i)^n-1}{i}
]
Where:
- (FV) = total future value
- (PV) = starting amount
- (PMT) = monthly deposit
- (i) = monthly interest rate
- (n) = total number of monthly periods
If the annual nominal interest rate is (r) and the investment period is (t) years, the usual monthly-compounding assumptions are:
[
i=\frac{r}{12},\qquad n=12t
]
The first part of the formula calculates the future value of the starting amount. The second calculates the future value of the monthly deposits.
If the monthly interest rate is zero, the formula simplifies to:
[
FV=PV+(PMT\times n)
]
In that case, the ending balance is simply the starting amount plus all contributions, provided there are no withdrawals or other adjustments.
The formula assumes a constant rate, monthly compounding, and deposits made at the end of each month. Deposits made at the beginning of each month would have an additional month to grow. Actual investment results can differ when returns fluctuate or fees and taxes apply.
Future Value Calculator Example: $10,000 Plus $200 Per Month
Suppose you start with $10,000, deposit another $200 at the end of every month, and assume a 7% nominal annual return compounded monthly for 10 years.
Here are the inputs:
| Input |
Value |
| Starting amount |
$10,000 |
| Monthly deposit |
$200 |
| Annual interest rate |
7% |
| Investment period |
10 years |
| Number of monthly deposits |
120 |
Step 1: Convert the annual rate to a monthly rate
Divide the annual nominal rate by 12:
[
i=\frac{0.07}{12}=0.0058333
]
The monthly rate is approximately 0.5833%.
Step 2: Calculate the number of months
Multiply the investment period by 12:
[
n=10\times12=120
]
The money is projected to grow over 120 monthly periods.
Step 3: Calculate the future value of the starting amount
The initial $10,000 grows for the full 10 years:
[
FV_{\text{starting}}=10,000(1+0.07/12)^{120}
]
The projected value of the starting amount is approximately $20,096.15.
Step 4: Calculate the future value of monthly deposits
You contribute $200 each month for 120 months:
[
\text{Total monthly deposits}=200\times120=$24,000
]
Because each deposit has a different amount of time to grow, the future value of the deposits is approximately $34,616.96 under the stated assumptions.
Step 5: Add both amounts
Add the projected value of the starting balance to the projected value of the monthly deposits:
[
FV_{\text{total}}=20,096.15+34,616.96
]
The projected future value is approximately $54,713.11.
You contribute $34,000 altogether: the initial $10,000 plus $24,000 in monthly deposits. The remaining approximately $20,713.11 represents the projected growth above your contributions.
This example illustrates why it is useful to separate the future value from the total deposits. The ending balance reflects both the money you put in and the growth assumed by the calculation.
How Monthly Deposits Change Your Future Savings
A starting balance is only one part of a savings plan. Regular contributions can make a substantial difference because each deposit adds to the amount that may earn future returns.
Consider three hypothetical plans that all begin with $10,000 and run for 10 years. Assume a 7% nominal annual rate compounded monthly and deposits made at the end of each month.
| Savings plan |
Starting amount |
Monthly deposit |
| Lump sum only |
$10,000 |
$0 |
| Smaller monthly contribution |
$10,000 |
$100 |
| Larger monthly contribution |
$10,000 |
$200 |
The lump-sum-only plan relies entirely on the growth of the original $10,000. The other plans add new money throughout the period, so their projected ending balances include both those contributions and the growth they accumulate.
Increasing the monthly deposit raises the ending balance in two ways: you contribute more money, and those additional deposits have opportunities to grow.
This is why a higher future value does not automatically mean a higher investment return. When comparing savings plans, look at both the projected ending balance and the amount you contributed to achieve it.
How Interest Rate and Time Affect Future Value
The annual return and investment period can change your projected balance even when your starting amount and monthly deposit stay the same. To understand their effects, adjust one input at a time.
What happens when the interest rate increases?
A higher assumed interest rate generally produces a higher future value, provided the other inputs and compounding assumptions remain unchanged.
For example, compare two projections using the same starting amount, monthly deposit, and 10-year period, but different assumed annual rates. The higher-rate scenario will generally finish with a larger balance because the money accumulates growth at a faster assumed pace.
However, the result is a mathematical comparison, not a prediction that an investment will deliver the higher return. Savings accounts may have changing rates, while market-based investments can experience both gains and losses.
What happens when you invest for longer?
Time gives the original balance and earlier deposits more opportunities to accumulate growth. The effect can become more noticeable over longer periods because accumulated growth can itself earn returns.
For example, compare the same savings plan over 5, 10, and 20 years. Keep the annual rate and monthly deposit constant. The longer projection includes more deposits and gives existing money more time to grow.
A longer period does not remove investment risk, but it helps explain why the time horizon is an important input when estimating future value.
Why starting earlier can make a difference
Imagine two people who save the same amount each month and assume the same annual return, but one begins several years earlier. The earlier saver has more time to make deposits and allow those deposits to accumulate growth.
The difference is not necessarily the result of a better return. It can come simply from contributing for longer and allowing the money to remain invested.
If your goal is to estimate a retirement balance, you can use this calculator for a basic growth projection and then explore the additional income and retirement assumptions in our Retirement Calculator.
Future Value vs. Present Value
Future value and present value answer opposite questions.
Future value estimates what money available today may become after earning a specified return over time. It can also account for regular contributions when the calculation supports them.
Present value estimates what a future payment or amount is worth today under a chosen discount rate and time period.
For example, future value can help estimate the balance you might build by saving $10,000 today and contributing each month. Present value can help you assess what a payment you expect to receive 10 years from now is worth in today’s terms.
Use the Present Value Calculator when you need to work backward from a future amount rather than project today’s money forward.
Future Value vs. Compound Interest
Future value is the entire projected balance at the end of the investment period. Compound interest is the growth above the money you contributed, under the assumptions used in the calculation.
Suppose your total contributions amount to $20,000 and the projected future value is $30,000. The future value is $30,000, while the growth above your contributions is $10,000.
Compound growth occurs when accumulated interest or investment earnings remain in the account and can generate further returns. Over time, that process can cause the balance to grow faster than it would if returns were earned only on the original amount.
If you want to examine how compounding changes the value of a single deposit or a regular savings plan, use our Compound Interest Calculator.
What Can Make Your Actual Future Value Different?
A future value estimate is only as useful as the assumptions behind it. Several factors can make the amount you eventually have different from the calculator’s projection.
Changing investment returns: The calculator uses an assumed annual rate. Real investments may earn different returns from one year to the next, and some years may produce losses.
Fees and taxes: Account charges, fund expenses, transaction costs, and taxes can reduce the amount of growth you keep. If these costs are not included in the inputs, the displayed future value will not reflect them.
Missed or changed deposits: A projection assumes that you follow the contribution pattern entered into the calculator. Skipping deposits or withdrawing money changes the amount available to grow.
Deposit timing: Deposits made at the beginning of each month have more time to grow than deposits made at the end of the month. The calculation should match the timing assumption used by the tool.
Inflation: A larger future balance does not necessarily mean you will be able to buy proportionally more goods and services. Prices may rise during the investment period, reducing the future purchasing power of your money.
To explore that last point, use the Inflation Calculator to estimate how changes in prices affect the value of money over time.
Common Mistakes When Estimating Future Value
- Mixing annual and monthly rates: If the formula uses a monthly rate, make sure the annual nominal rate is converted consistently.
- Using years as the number of monthly periods: A 10-year investment with monthly compounding has 120 monthly periods, not 10.
- Confusing deposits with investment growth: Your ending balance includes money you contribute as well as the growth assumed by the calculation.
- Assuming a projected return is guaranteed: The calculator illustrates a scenario based on an input rate; it does not promise that return.
- Ignoring inflation: A future dollar amount may have less purchasing power than the same amount today.
- Comparing plans with several changing inputs: Change one variable at a time when you want to understand what is driving the difference between projections.
Plan Ahead With a Future Value Estimate
Use the Future Value Calculator to see how a starting balance, monthly contributions, an assumed annual return, and time combine to shape a potential ending balance. Review the projected future value alongside total deposits and compound interest earned so you can distinguish the money you put in from the growth assumed by the calculation.
For a more meaningful estimate, use realistic assumptions, compare a few scenarios, and remember that the result is a planning aid rather than a guarantee of future performance.
