$200 a month for 25 years at returns from 4% to 10%
| Return | Balance | Of which growth | In today’s dollars |
|---|---|---|---|
| 4% | $101,770 | $41,770 | $48,606 |
| 5% | $117,147 | $57,147 | $55,950 |
| 6% | $135,258 | $75,258 | $64,600 |
| 7% | $156,608 | $96,608 | $74,797 |
| 8% | $181,798 | $121,798 | $86,828 |
| 10% | $246,665 | $186,665 | $117,809 |
Year by year at 7%
| Year | Put in so far | Balance | In today’s dollars |
|---|---|---|---|
| 1 | $2,400 | $2,476 | $2,404 |
| 2 | $4,800 | $5,125 | $4,831 |
| 3 | $7,200 | $7,960 | $7,285 |
| 5 | $12,000 | $14,239 | $12,283 |
| 10 | $24,000 | $34,210 | $25,456 |
| 15 | $36,000 | $62,221 | $39,937 |
| 20 | $48,000 | $101,507 | $56,202 |
| 25 | $60,000 | $156,608 | $74,797 |
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 $200 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) |
|---|---|---|---|
| 13 years | $34,391 | $48,189 | $67,511 |
| 25 years | $86,493 | $146,064 | $245,432 |
The middle of the simulation sits below the steady 7% figure of $156,608 because ups and downs cost compounding: a 20% loss needs a 25% gain to get back.
What $156,608 would pay in retirement
At a 4% first-year withdrawal, $156,608 pays about $6,264 a year, $522 a month, before tax; in today’s dollars that is about $2,992 a year. How long a balance near it lasts at each withdrawal: how long $150,000 lasts. To stop saving early and let growth do the rest, see Coast FIRE numbers by age.
$2,400 a year fits in an IRA, whose 2026 limit is $7,500 under 50. See contribution limits, the 401(k) calculator and the Roth IRA calculator.
$200 a month for other terms
| Years | Balance | In today’s dollars |
|---|---|---|
| $200 a month for 5 years | $14,239 | $12,283 |
| $200 a month for 10 years | $34,210 | $25,456 |
| $200 a month for 15 years | $62,221 | $39,937 |
| $200 a month for 20 years | $101,507 | $56,202 |
| 25 years | $156,608 | $74,797 |
| $200 a month for 30 years | $233,891 | $96,360 |
| $200 a month for 35 years | $342,283 | $121,642 |
| $200 a month for 40 years | $494,308 | $151,534 |
Other amounts for 25 years
$50 a month: $39,152, $100 a month: $78,304, $150 a month: $117,456, $250 a month: $195,760, $300 a month: $234,913, $400 a month: $313,217, $500 a month: $391,521, $600 a month: $469,825, $750 a month: $587,281, $1,000 a month: $783,042, $1,500 a month: $1,174,563, $2,000 a month: $1,566,084, $2,500 a month: $1,957,605, $3,000 a month: $2,349,126, $5,000 a month: $3,915,209.
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.