Forecast how your savings can grow with compound interest, recurring deposits, and flexible compounding periods so you can plan your next financial milestone with more confidence.
Enter your investment details and click Calculate to see projections
Follow these simple steps to calculate your investment's future value and plan your financial goals.
Input your starting investment amount and periodic deposit plan.
Choose your expected annual return rate and compounding frequency.
Select your investment timeline using the interactive slider.
Get detailed results with growth chart and breakdown analysis.
Every number in your results panel tells a different part of your savings story. Here is what each metric means and how to use it.
The projected total balance at the end of your investment period. This is the combined result of your initial investment, all periodic deposits, and every round of compound interest earned along the way. A higher rate or longer timeline grows this figure exponentially rather than linearly — that acceleration is compound interest doing its work.
The sum of every dollar you personally contributed — your opening balance plus all periodic deposits combined. This is your cost basis. Comparing it to future value immediately shows how much of your ending balance came from your own pocket versus from compound growth earned on top of your contributions.
Future value minus total invested. This is the pure compounding reward — money you earned without depositing it yourself. On long-horizon plans at reasonable return rates, interest earned often exceeds total invested, meaning the market effectively worked harder for you than you did over the full investment period.
Interest earned expressed as a percentage of total invested. This cumulative return lets you compare scenarios fairly — for example, a 10-year plan at 7% versus a 5-year plan at 10% — and see which option actually multiplies your money more over its full timeline.
The stacked bar chart separates contributions (blue) from interest earned (green) at each year marker. Watch the green portion grow larger relative to blue over time — that widening gap is compound interest accelerating. In the early years contributions dominate. In later years, interest takes over and dwarfs what you deposit.
Choosing "Beginning of Period" means each deposit earns one extra compounding period compared to "End of Period." On a 30-year plan with a 7% annual rate and $500 monthly deposits, this timing difference alone can add several thousand dollars to your ending balance — with zero extra money contributed by you.
The calculator uses two formulas combined. The first handles your initial lump sum. The second handles your recurring deposits. Together they give you the total projected balance at any point in your timeline.
When the annual rate is 0%, the lump sum stays unchanged and deposits simply sum without growth. The calculator handles this edge case automatically.
Scenario inputs
Step 1 — Find the periodic rate
r/n = 7% ÷ 12 = 0.5833% per month
Step 2 — Total compounding periods
n × t = 12 × 10 = 120 periods
Step 3 — Future value of the initial $10,000
FV₁ = $10,000 × (1.005833)¹²° = $10,000 × 2.0097 ≈ $20,097
Step 4 — Future value of $500/month deposits
FV₂ = $500 × [(2.0097 − 1) ÷ 0.005833] = $500 × 173.1 ≈ $86,550
Result
Total FV = $20,097 + $86,550 = $106,647
Total invested: $70,000 • Interest earned: $36,647 • Total return: 52.4%
You can verify this result by entering the exact same inputs into the calculator above.
Real scenarios with actual numbers show you exactly how the calculator applies to goals you already have. Try each set of inputs in the tool above.
$25,000 start • $400/mo • 7% • 25 yrs
~$467,000
$145,000 invested • ~$322,000 from compound interest
Capturing your employer match first is equivalent to an immediate 50–100% return before any market growth. Run this scenario at 6% and 8% to see a realistic range. The difference between those two rates over 25 years is more than $150,000 in ending balance.
$5,000 start • $250/mo • 6% • 18 yrs
~$111,500
$59,000 invested • ~$52,500 from compound interest
Starting when your child is born versus age 10 can more than double the balance at age 18 because the early years add eight more compounding periods. Even $100 a month started at birth beats $400 a month started at age 10 on most rate assumptions between 5% and 8%.
$1,000 start • $200/mo • 4.5% • 3 yrs
~$9,050
$8,200 invested • ~$850 from compound interest
A high-yield savings account (HYSA) at 4–5% APY keeps your emergency fund liquid while still growing. Set compounding to monthly and deposit timing to "Beginning of Period" if your savings transfer happens on payday to squeeze a bit more growth from each deposit.
$0 start • $1,200/mo • 5% • 4 yrs
~$63,600
$57,600 invested • ~$6,000 from compound interest
First-time homebuyers in high-cost states like California often need a 20% down payment of $100,000 or more. Use the calculator to work backward from your target amount: enter the down payment as future value, adjust the monthly deposit until the number fits your budget, then set the time horizon accordingly.
$0 start • $583/mo • 8% • 30 yrs
~$869,000
$209,880 invested • ~$659,000 from compound interest
$583/month equals the 2026 Roth IRA annual contribution limit of $7,000 spread across 12 months. All growth and qualified withdrawals are tax-free, so the real after-tax value of this account likely exceeds what you would accumulate in a taxable brokerage account by a significant margin.
$50,000 start • $500/mo • 3.5% • 10 yrs
~$142,600
$110,000 invested • ~$32,600 from compound interest
Compare this to the same inputs at 7% (which yields roughly $176,000) to quantify the long-term cost of choosing lower-risk investments. The ~$33,400 gap is the risk premium you give up in exchange for reduced volatility, more predictable returns, and better principal protection in down markets.
This calculator works for any account type — taxable brokerage, 401(k), IRA, Roth IRA, HSA, or 529 — because the underlying compound interest math is identical. What changes is the tax treatment of your deposits and withdrawals. Understanding the 2026 contribution limits for each account type helps you set the most accurate deposit amount when projecting your savings growth.
| Account Type | Under 50 | Age 50+ |
|---|---|---|
| 401(k) / 403(b) | $23,500 | $31,000 |
| Traditional / Roth IRA | $7,000 | $8,000 |
| HSA (self-only) | $4,300 | $4,300 |
| HSA (family) | $8,550 | $8,550 |
For a traditional IRA or 401(k), use your pre-tax rate of return (e.g., 7%) but remember you will owe ordinary income taxes on every dollar you withdraw. To compare apples to apples with a Roth account, reduce the rate by your expected effective tax rate in retirement — for example, at a 22% rate, model 7% × (1 − 0.22) ≈ 5.5% as the after-tax equivalent.
For a Roth IRA, you can use your full pre-tax rate (e.g., 7–8%) since qualified withdrawals after age 59½ are completely tax-free. This makes the Roth future value directly comparable to actual spendable dollars in retirement.
California: State income tax rates reach up to 13.3%, making tax-advantaged accounts like Roth IRAs and 401(k)s especially valuable. California also does not allow a state income tax deduction for traditional IRA contributions, which makes Roth accounts more attractive for many CA residents who want to minimize total lifetime taxes on their savings.
New York: State plus New York City income tax can top 10.9% for high earners. Maximizing pre-tax 401(k) contributions reduces your NY taxable income in the year of contribution, which can translate to a meaningful annual cash flow benefit on top of the long-term investment growth.
Texas & Florida: No state income tax, so the tax benefit comparison between Roth and traditional accounts is simplified to the federal level alone. That said, maximizing contributions in either state still provides the same compounding benefits regardless of which account type you choose.
Run two side-by-side scenarios: one at your full gross return rate (for Roth accounts) and one at your after-tax equivalent (for traditional accounts). The difference in ending balance shows you the dollar value of tax-free compounding in your specific situation and tax bracket.
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Get answers to common questions about future value calculations and investment planning.
Future value is the amount your investment will be worth at a specific future date, assuming a constant rate of return. Understanding it helps you set savings targets, choose between investment options, and model whether your current plan will meet long-term financial goals like retirement or college tuition.
The math is precise for the inputs you enter. However, real-world returns vary because markets fluctuate, fees apply, taxes reduce gains, and contribution amounts change. Treat the result as a planning estimate, not a guaranteed outcome. Running optimistic and conservative rate scenarios gives you a more useful range.
Historical US stock market returns average roughly 7–10% annually over long periods. Conservative savers may test 3–5% for bonds or cash equivalents. Balanced portfolios often use 5–7%. Run multiple rate scenarios — such as an optimistic 9% and a conservative 5% — to see the range of possible outcomes for your savings plan.
Beginning of period deposits earn slightly more because each payment gains one extra compounding period. End of period deposits match a standard ordinary annuity and are more common since most people deposit after receiving income. The difference widens as your return rate and time horizon increase.
More frequent compounding means interest is added to your balance more often, so the next round of interest compounds on a slightly larger number. The biggest improvement is from annual to monthly compounding. Moving from monthly to daily has a much smaller effect. Most savings and investment accounts compound daily or monthly.
This calculator does not account for inflation, investment fees, income taxes, capital gains taxes, or changes in contribution amounts over time. To get a more realistic estimate, subtract your expected annual fee (expense ratio) from the return rate, and compare the result to inflation-adjusted spending targets.
Enter your current 401(k), IRA, or brokerage balance as the initial investment and your regular contribution as the periodic deposit. Set the rate to a historical average such as 7% for a stock-heavy portfolio. Then adjust the time horizon to your expected retirement year to see whether your balance is on track.
Future value calculates what a sum of money will be worth later, given a rate of return. Present value works in the opposite direction — it discounts a future amount back to its worth in today’s dollars. Future value is useful for savings goals; present value helps you evaluate whether a future cash flow justifies a current investment.
Yes. Enter your current 529 balance as the initial investment and your planned monthly contribution as the periodic deposit. Use a 6–7% return rate for an age-based portfolio. Set the time horizon to the number of years until your child starts college to estimate whether your savings plan will cover projected tuition costs.
Revisit your projections at least once a year or whenever your income, expenses, or investment strategy changes significantly. After major life events — a raise, a new baby, or a market correction — updating the inputs keeps your long-term plan aligned with current reality and your actual savings rate.