Reaching $1 million is a function of time and return, not luck. At a 7% annual return — a common long-run planning assumption for a diversified investment portfolio — $2,000 a month reaches $1 million in about 22 years. $1,000/month takes about 30 years. $500/month takes about 40 years.
This calculator uses 7% as the default rate because a million-dollar goal over decades almost always implies investing, not a savings account. Adjust the rate to 4–5% if your money will stay in cash savings; use 6–8% for a broadly diversified portfolio of stocks.
Why the growth curve bends upward
The chart below the result shows a curve that bends sharply upward over time. In the first decade, your contributions are the dominant force. By the second decade, the compounding interest on your existing balance begins to outpace what you add each month. In the final years, a single month of investment growth can exceed your monthly contribution by a wide margin.
This is the core argument for starting early. Every year of compound returns in the early period is worth dramatically more than the same returns in the later period, because early returns compound on top of each other for decades.
The rate of return matters more than the contribution on this timeline
Over a 30-year horizon, the difference between a 6% and 8% annual return on a consistent monthly contribution is enormous. With $1,000/month at 6%, you reach $1 million in about 35 years. At 8%, it drops to about 26 years — a full 9-year difference from a 2% rate improvement.
This is why investing in low-cost, broadly diversified index funds matters so much for long-term millionaire goals. Minimizing fees (which reduce your effective return) and maintaining diversification (which sustains long-run returns) are the two highest-leverage choices on a decades-long plan.
Frequently asked questions
How long does it take to save $1 million?
At $1,000/month with 7% annual return: about 30 years. At $2,000/month: about 22 years. At $3,000/month: about 17 years. With a $50,000 starting balance and $1,000/month at 7%: about 25 years. Enter your real numbers above.
What return should I use for a $1 million savings goal?
If the money will be invested in a broadly diversified stock index fund, 6–8% before inflation is a common long-run planning range. For a HYSA, use 4–5%. Be honest about your actual investment strategy — using an optimistic return makes the timeline look shorter than it will be.
Is $1 million enough to retire?
The 4% withdrawal rule suggests $1 million supports about $40,000/year in withdrawals with a high probability of lasting 30+ years. Whether that is enough depends on your expected Social Security income, retirement age, and spending needs. The retirement calculator on this site can model your specific scenario.
How do I save $1 million on an average salary?
The key is starting early and staying consistent. $500/month invested in a diversified index fund at 7% from age 25 reaches $1 million by approximately age 65. Increasing contributions as income grows, avoiding lifestyle inflation, and not withdrawing during market dips all dramatically accelerate the timeline.