Future Value of Money Calculator
See what any lump sum grows to at 5, 10, 20, and 30 years — including an inflation-adjusted "today's dollars" column so you know what that future number actually buys.
$200 invested today at 10% grows to $1,345 in 20 years ($905 in today's dollars)
| Years | Future Value | In Today's $ |
|---|---|---|
| 5 yrs | $322 | $292 |
| 10 yrs | $519 | $426 |
| 15 yrs | $835 | $621 |
| 20 yrs | $1,345 | $905 |
| 25 yrs | $2,167 | $1,321 |
| 30 yrs | $3,490 | $1,927 |
"Today's $" deflates nominal values at 2% annual inflation. For illustration only — returns are not guaranteed.
Growth Over Time
20 years · nominal vs. inflation-adjusted · hover to explore
Value at year 20
$1,345
$905 real
That $200 Job Didn't Pay You $200
Here's how I think about money — and it changed the way I make decisions completely.
When someone offers me a $200 gig, my old instinct was "is that worth my time?" Now I ask a different question: if I invest this $200 at 10%, what does it actually become?
In 10 years: ~$519. In 20 years: ~$1,345. In 30 years: ~$3,490.
That job didn't pay me $200. It paid me $1,345 in 20-year purchasing power — assuming I put it to work instead of spending it. That reframe makes you radically more intentional about which dollars you earn, spend, and invest.
Of course, inflation erodes the nominal number. At 2% average annual inflation, that $1,345 is worth roughly $904 in today's dollars. Still more than 4× your original $200 — but knowing the real-world buying power matters more than the headline number.
How the Math Works
Future value uses standard compound growth:
FV = Principal × (1 + rate)^years
The inflation-adjusted column divides that result by (1 + inflation)^years, converting nominal future dollars back into present-day purchasing power.
The default 10% return is the S&P 500's historical long-run average before inflation. Conservative investors model 6–7%. If you want pure "real" return (after inflation already baked in), subtract inflation from the rate — e.g., set rate to 8% and inflation to 0%.
When to Use This Calculator
- Evaluating a freelance job or side gig — see its 20-year value, not just today's payout
- Understanding opportunity cost: that new phone costs $1,000 today, but $6,727 in 30 years
- Modeling a windfall — bonus, tax refund, or inheritance — and what it could become untouched
- Teaching a teenager that $500 today is worth $8,700 in 30 years — the most powerful financial lesson there is
- Evaluating a business deal: if this contract brings in $10,000, what is that really worth?
Frequently Asked Questions
What is the "future value" of money?
Future value is what a sum of money today will be worth at a specific point in the future, assuming it earns a set rate of return. A dollar today is worth more than a dollar tomorrow because it can be invested and grow through compounding.
Why use 10% as the default return?
The S&P 500 has returned roughly 10% per year on average historically (before inflation). It's commonly used as an illustrative benchmark. For more conservative projections, 6–7% after inflation is typical among financial planners.
What does "today's dollars" mean in the table?
The inflation-adjusted column shows what the nominal future value is worth in present-day purchasing power. If inflation is 2% and your $200 grows to $1,345 in 20 years, that $1,345 buys about $904 worth of goods at today's prices — because inflation erodes purchasing power over time.
Does this account for taxes on investment gains?
No — the calculator shows pre-tax growth. In a taxable brokerage account, capital gains taxes reduce your effective return. In a tax-advantaged account like a Roth IRA, qualified withdrawals can be tax-free. For a taxable estimate, reduce the annual return rate by your estimated tax drag (e.g., use 7% instead of 10%).
What if I keep adding money over time instead of a one-time investment?
This calculator is for lump-sum (one-time) investments only. If you want to model ongoing monthly contributions compounding over time, use the Retirement Calculator or the Savings Goal Calculator.
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