Accumulating $1 million is achievable through consistent savings at market-rate returns — but it requires time, not magic. At 7% annual return (a common long-run planning assumption for a diversified investment portfolio), $1,000 a month reaches $1 million in about 30 years. Double the monthly contribution and the timeline drops to roughly 22 years.
Note that this calculator uses 7% as the default rate, not 4%. A million-dollar goal over decades typically implies investing, not holding cash in a HYSA. Adjust the rate to match where your money will actually go: 4–5% for a savings account, 6–8% for a broadly diversified investment portfolio.
The exponential growth shape of a long savings journey
The month-by-month chart below the result shows something that surprises many people: the balance curve bends sharply upward in the later years. Your contributions add a fixed amount each month, but the interest compounds on an ever-larger base. In year 1, interest adds a few hundred dollars. In year 25, that same rate produces tens of thousands annually.
This is why the last decade of a 30-year savings plan often adds more total value than the first two decades combined. The math rewards patience more than most people intuitively expect.
What actually determines how long it takes
Starting balance matters the most on short timelines. Monthly contribution matters most over medium timelines (10–20 years). For very long timelines (20+ years), the rate of return dominates everything else — a difference of 1 percentage point in annual return can change the end balance by hundreds of thousands of dollars.
The 'Switch to higher return' What-If chip shows the impact of a 1% rate improvement. The 'Invest an extra $200/month' chip shows the impact of additional contributions. Compare both to see which lever matters more for your specific numbers.
The role of a starting balance
If you already have savings or investments, enter them as your starting balance. $50,000 already saved at 7% with $1,000/month reaches $1 million in about 23 years instead of 30. The starting balance earns compounding returns from day one — each dollar already invested is worth far more in present-value terms than a dollar invested in year 15.
This is the core argument for starting to invest early: even a small amount saved in your 20s has decades to compound before retirement, making it worth far more than the same dollar invested later.
Frequently asked questions
How long does it take to save $1 million?
At $1,000/month with a 7% annual return: about 30 years. At $2,000/month: about 22 years. At $3,000/month: about 17 years. With a $100,000 starting balance and $1,000/month at 7%: about 23 years. Enter your actual numbers above.
What return should I use for a million-dollar savings goal?
If the money will be invested in a broadly diversified stock portfolio, 6–8% is a common long-run planning assumption before inflation, or 4–5% after inflation. For money staying in a HYSA, use 4–5%. Be realistic — plugging in 10% can make the timeline look shorter than it will be.
Is $1 million enough to retire on?
The 4% rule suggests a $1 million portfolio can support $40,000/year in withdrawals with a high probability of lasting 30+ years. Whether that is enough depends on your expenses, Social Security income, and retirement age. The retirement calculator on this site can model your specific scenario.
Does starting early really matter that much?
Yes — dramatically. Starting at 25 instead of 35 gives your money an extra 10 years of compounding. At 7%, money doubles roughly every 10 years. That means dollars invested at 25 are worth four times more at 65 than dollars invested at 45.