$2,500 a month for 40 years at returns from 4% to 10%
| Return | Balance | Of which growth | In today’s dollars |
|---|---|---|---|
| 4% | $2,902,659 | $1,702,659 | $889,830 |
| 5% | $3,706,311 | $2,506,311 | $1,136,195 |
| 6% | $4,769,194 | $3,569,194 | $1,462,029 |
| 7% | $6,178,855 | $4,978,855 | $1,894,170 |
| 8% | $8,052,698 | $6,852,698 | $2,468,610 |
| 10% | $13,875,870 | $12,675,870 | $4,253,743 |
Year by year at 7%
| Year | Put in so far | Balance | In today’s dollars |
|---|---|---|---|
| 1 | $30,000 | $30,951 | $30,049 |
| 2 | $60,000 | $64,068 | $60,390 |
| 3 | $90,000 | $99,504 | $91,060 |
| 5 | $150,000 | $177,990 | $153,535 |
| 10 | $300,000 | $427,629 | $318,196 |
| 15 | $450,000 | $777,762 | $499,216 |
| 20 | $600,000 | $1,268,841 | $702,526 |
| 25 | $750,000 | $1,957,605 | $934,963 |
| 30 | $900,000 | $2,923,632 | $1,204,497 |
| 35 | $1,050,000 | $4,278,534 | $1,520,520 |
| 40 | $1,200,000 | $6,178,855 | $1,894,170 |
The range in 1,000 simulated markets
A 7% average does not arrive as 7% every year. In 1,000 simulated sequences of returns averaging 7% with 12% volatility, this is where $2,500 a month ended up: 1 in 10 markets finished below the first figure, half below the middle one, and 1 in 10 above the last.
| After | Weak (1 in 10 lower) | Middle | Strong (1 in 10 higher) |
|---|---|---|---|
| 20 years | $765,911 | $1,185,096 | $1,881,923 |
| 40 years | $2,722,286 | $5,407,852 | $10,774,850 |
The middle of the simulation sits below the steady 7% figure of $6,178,855 because ups and downs cost compounding: a 20% loss needs a 25% gain to get back.
What $6,178,855 would pay in retirement
At a 4% first-year withdrawal, $6,178,855 pays about $247,154 a year, $20,596 a month, before tax; in today’s dollars that is about $75,767 a year. How long a balance near it lasts at each withdrawal: how long $5 million lasts. To stop saving early and let growth do the rest, see Coast FIRE numbers by age.
$30,000 a year is more than the 2026 401(k) limit of $24,500, so part of it would go to a taxable account or a spouse’s plan. See contribution limits, the 401(k) calculator and the Roth IRA calculator.
$2,500 a month for other terms
| Years | Balance | In today’s dollars |
|---|---|---|
| $2,500 a month for 5 years | $177,990 | $153,535 |
| $2,500 a month for 10 years | $427,629 | $318,196 |
| $2,500 a month for 15 years | $777,762 | $499,216 |
| $2,500 a month for 20 years | $1,268,841 | $702,526 |
| $2,500 a month for 25 years | $1,957,605 | $934,963 |
| $2,500 a month for 30 years | $2,923,632 | $1,204,497 |
| $2,500 a month for 35 years | $4,278,534 | $1,520,520 |
| 40 years | $6,178,855 | $1,894,170 |
Other amounts for 40 years
$50 a month: $123,577, $100 a month: $247,154, $150 a month: $370,731, $200 a month: $494,308, $250 a month: $617,886, $300 a month: $741,463, $400 a month: $988,617, $500 a month: $1,235,771, $600 a month: $1,482,925, $750 a month: $1,853,657, $1,000 a month: $2,471,542, $1,500 a month: $3,707,313, $2,000 a month: $4,943,084, $3,000 a month: $7,414,626, $5,000 a month: $12,357,710.
How it is worked out
Monthly amounts are deposited at the end of each month and compounded monthly at the rate that equals the annual return; lump sums compound once a year. The headline return is 7% a year, the Trinity-style average the site’s retirement pages use; stock-heavy portfolios have averaged more over long periods and bond-heavy ones less, which is why every page shows 4% to 10%. Today’s dollars divide by 3% inflation a year. The range comes from 1,000 simulated sequences of yearly returns averaging 7% with 12% volatility, with each year’s deposits added through the year. Fees and taxes are not taken out. More on the methodology page.