$2,500 a month for 35 years at returns from 4% to 10%
| Return | Balance | Of which growth | In today’s dollars |
|---|---|---|---|
| 4% | $2,249,789 | $1,199,789 | $799,538 |
| 5% | $2,771,157 | $1,721,157 | $984,823 |
| 6% | $3,434,010 | $2,384,010 | $1,220,390 |
| 7% | $4,278,534 | $3,228,534 | $1,520,520 |
| 8% | $5,356,419 | $4,306,419 | $1,903,582 |
| 10% | $8,496,978 | $7,446,978 | $3,019,685 |
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 |
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) |
|---|---|---|---|
| 18 years | $660,877 | $990,403 | $1,529,372 |
| 35 years | $2,107,801 | $3,871,540 | $7,405,390 |
The middle of the simulation sits below the steady 7% figure of $4,278,534 because ups and downs cost compounding: a 20% loss needs a 25% gain to get back.
What $4,278,534 would pay in retirement
At a 4% first-year withdrawal, $4,278,534 pays about $171,141 a year, $14,262 a month, before tax; in today’s dollars that is about $60,821 a year. How long a balance near it lasts at each withdrawal: how long $4 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 |
| 35 years | $4,278,534 | $1,520,520 |
| $2,500 a month for 40 years | $6,178,855 | $1,894,170 |
Other amounts for 35 years
$50 a month: $85,571, $100 a month: $171,141, $150 a month: $256,712, $200 a month: $342,283, $250 a month: $427,853, $300 a month: $513,424, $400 a month: $684,565, $500 a month: $855,707, $600 a month: $1,026,848, $750 a month: $1,283,560, $1,000 a month: $1,711,414, $1,500 a month: $2,567,120, $2,000 a month: $3,422,827, $3,000 a month: $5,134,241, $5,000 a month: $8,557,068.
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.