In Short
A 30-year-old with $25,000 saved who adds $750 a month at a 7% return reaches $1 million in about 29 years, at age 59. At 3% inflation, that $1 million buys what about $422,000 buys today. Adding $200 a month gets there about 2.5 years sooner [1][2].
How to Use the Millionaire Calculator
- Enter your age, what you've saved and what you add each month.
- Set the yearly return you expect and, if you like, a yearly raise in your contribution.
- Keep the $1,000,000 target or type your own, and set inflation for the today's-dollars figure.
- Or tap Say It All: “I'm 35 with 50,000 saved, I add 1,000 a month at 7 percent.”
The Formula
Each month your balance grows by one month of return and your contribution is added. The calculator steps month by month until the balance reaches the target, then converts the target to today's dollars [1][2].
- Monthly return r = (1 + yearly return)^(1/12) − 1
- New balance = old balance × (1 + r) + monthly contribution
- Contribution rises by the yearly increase at the start of each year
- Today's dollars = target ÷ (1 + inflation)^years
Worked Examples
| Scenario | Inputs | Result |
|---|---|---|
| Steady saver | Age 30, $25,000 saved, $750/month, 7% | $1 million at age 59 (29 years 2 months) · worth about $422,261 today at 3% inflation |
| Mid-career catch-up | Age 35, $50,000 saved, $1,000/month, 7% | Age 59 (24 years 4 months) · about $487,111 in today's dollars |
| Starting from zero | Age 25, $0, $500/month, 7% | Age 62 (37 years 2 months) |
| Raises as pay grows | Age 30, $10,000, $500/month rising 3% a year, 7% | Age 61 (31 years 7 months) |
Illustrative examples, not projections. Figures use the tax year shown and the assumptions above.
How Long Does It Take to Become a Millionaire?
It depends on three things: what you start with, what you add and the return. Time does most of the work. In the first example, your own money (the $25,000 plus contributions) adds up to about $287,500 by age 59. The other $712,500 of the $1 million is growth.
The sensitivity cards show which lever matters most for you. For a 30-year-old saving $750 a month, an extra $200 a month saves about 2.5 years, and a 1-point higher return about 2.3 years. A one-time $10,000 deposit saves about 11 months.
What Is $1 Million Worth in the Future?
Less than today. At 3% inflation, prices roughly double in 24 years (the Rule of 72) [3]. So $1 million reached in 29 years buys about what $422,000 buys now. The Bureau of Labor Statistics publishes the Consumer Price Index, the usual measure of inflation [2].
Change the target if a different number means financial freedom to you. The Financial Independence Calculator works out a target from your own spending.
Is a 7% Return Realistic?
It's an assumption, not a promise. Investment returns rise and fall, sometimes sharply, and the calculator uses the same return every year [1]. Try a lower rate to see a more cautious date. Results are before taxes and fees.
Frequently Asked Questions
How much do I need to save a month to be a millionaire in 30 years?
Starting from zero at a 7% yearly return, about $855 a month. With $25,000 already saved, about $692 a month does it.
How long does it take to make $1 million investing $500 a month?
At 7% from zero, about 37 years. At 8%, about 34 years. Returns are assumptions; real ones vary.
What will $1 million be worth in 30 years?
At 3% inflation, about $412,000 in today's dollars. At 2%, about $552,000 [2].
Does the calculator include taxes?
No. It shows growth before taxes and fees. Money in a 401(k) or IRA is taxed differently from a regular brokerage account.
Sources
- Compound Interest Calculator — U.S. Securities and Exchange Commission (Investor.gov)
- Consumer Price Index (CPI) — U.S. Bureau of Labor Statistics
- What is compound interest? (Rule of 72) — U.S. Securities and Exchange Commission (Investor.gov)
Official sources only: the IRS, SSA, BLS and other government agencies. Read how Zentavos researches.