Millionaire Calculator (Time to $1 Million)
Enter your savings, monthly investment, and expected return. See the year you cross $1M, your age when it happens, and the two levers that move the date most.
| Your age then | — |
| You will have deposited | — |
| Growth contributes | — |
| +$200/month would save | — |
The math of the first million
At $800/month from a $20,000 start with 8% returns, the $1M mark arrives in about 27 years. The striking part is the composition: you deposit roughly $280,000 — compounding supplies the other ~$700,000. Money makes most of the money; your job is time and consistency.
Which lever actually moves the date
| Change (same example) | New timeline | Difference |
|---|---|---|
| Baseline: $800/mo at 8% | ≈ 27 years | — |
| +$200/month ($1,000) | ≈ 25 years | ≈ 2 years sooner |
| Start with $50k instead of $20k | ≈ 25 years | ≈ 2 years sooner |
| Return 10% instead of 8% | ≈ 23.5 years | ≈ 3.5 years sooner — but not yours to choose |
| Start 5 years earlier | — | ≈ 5 years sooner, always |
Contribution size and starting early are the controllable levers. Chasing higher returns adds risk; starting earlier adds nothing but discipline.
Is $1M still enough?
By the 4% guideline, $1M sustains about $40,000/year of spending. Whether that is "rich" depends on your costs — and on inflation between now and then (test it with the inflation calculator). For a personalized target, the FIRE number calculator works backward from your spending instead.
Frequently asked questions
How long to save $1 million with $800 a month?
Starting from $20,000 at an 8% average return: about 27 years. You would deposit roughly $280,000; compound growth supplies the rest.
How much per month to reach $1M in 20 years?
From zero at 8%, roughly $1,700/month. From $50,000 already saved, about $1,300/month. Enter your numbers above to test scenarios.
What return should I assume?
8% approximates the US stock market’s long-run nominal average; 10% is optimistic; 7% is inflation-adjusted. Lower assumptions produce more honest timelines.
Is $1 million enough to retire?
It sustains roughly $40,000/year by the 4% rule. Enough depends on your spending, other income (Social Security, pensions), and when you retire. 25× your annual spending is the better personal target.
All Savings & Investing calculators
401(k) Match · APY vs APR · Break-Even Point · CD Ladder · Coast FIRE · College Savings · Compound Interest · Daily Interest · Dividend Income · DRIP · Emergency Fund · FIRE Number · How Long Will My Money Last · Inflation · Investment Fee · Lump Sum vs Dollar-Cost Averaging · Margin & Markup · Net Worth · NPV & IRR · Payback Period · Position Size · Present Value · Retirement Savings · Retirement Withdrawal · ROI · Roth vs Traditional · Rule of 72 · Savings Goal · Savings Rate · Simple Interest · Social Security Break-Even
Last updated: 2026-07-08