How Long Does It Take To Reach FIRE?

"How long will it take me to retire early?" is the first question almost everyone asks when they discover the FIRE movement. The answer is surprisingly mathematical — and surprisingly independent of your absolute income level.

The driving variable is your savings rate: the percentage of your take-home income you invest each month. Everything else — income, investment returns, market conditions — matters, but none of it matters as much as this single ratio. Here is the complete picture.

The Master Table: Savings Rate vs. Years to FIRE

The following table assumes you start from zero savings, earn a 7% annual return on your investments (a conservative long-term average for a diversified stock portfolio), and plan to use a 4% safe withdrawal rate in retirement. The years shown represent how long it takes to accumulate 25x your annual expenses.

Savings Rate	Years to FIRE	Retire At (Starting Age 25)	Retire At (Starting Age 30)
10%	~43 years	68	73
20%	~37 years	62	67
30%	~28 years	53	58
40%	~22 years	47	52
50%	~17 years	42	47
60%	~12 years	37	42
70%	~8.5 years	33–34	38–39
80%	~5.5 years	30–31	35–36

Notice what this table does not include: your income. Whether you earn $50,000 or $200,000, the years-to-FIRE number is nearly the same at each savings rate. A 50% savings rate on $50,000 takes roughly 17 years just like a 50% savings rate on $200,000. The absolute portfolio sizes differ — $625,000 vs. $2.5 million — but the timeline to reach 25x your spending is the same.

How Starting Age Changes the Equation

Starting your FIRE journey at 22 versus 32 makes an enormous difference — not because the years-to-FIRE math changes, but because of what happens at the finish line. Someone starting at 22 with a 50% savings rate could reach FIRE at 39. Someone starting at 35 with the same savings rate reaches FIRE at 52.

Both outcomes are vastly better than the traditional retirement at 65. But the compounding effect of starting early is dramatic. Consider: if you invest $2,000/month starting at 22, your money has an extra decade of compounding compared to starting at 32. At 7% annual returns, $2,000/month for 10 years grows to about $345,000 — and that $345,000, left alone for another decade, grows to nearly $680,000 before you add a single additional dollar.

The practical takeaway: starting now — even imperfectly, even at a modest savings rate — beats waiting until conditions are "perfect." A decade of delay at 10% savings rate is not merely 10 years slower; it significantly erodes the compounding runway you have left.

Three Real-World Scenarios

Scenario 1: Maya, Elementary School Teacher, Age 28, Earning $55,000

Maya takes home about $3,800 per month after taxes and her 403(b) contribution. She spends $2,800/month on rent ($1,100), a used car, groceries, utilities, and modest entertainment. She invests the remaining $1,000/month — a savings rate of about 26%.

At this rate, Maya's FIRE number is $33,600/year × 25 = $840,000. Investing $1,000/month at 7% returns, she reaches $840,000 in approximately 29 years — retiring at 57. Not "early" by extreme FIRE standards, but a full 8 years before the traditional retirement age, with a pension that may kick in on top of her portfolio.

If Maya pushes her savings rate to 40% by refinancing her car loan, getting a roommate, and picking up summer tutoring ($500/month extra), her timeline shortens to roughly 22 years — retiring at 50. That is a meaningful change from a few deliberate adjustments.

Scenario 2: Alex, Software Engineer, Age 27, Earning $120,000

Alex takes home about $7,200/month. After maxing his 401(k) at $24,500/year and a Roth IRA at $7,500/year, he has around $4,200/month in take-home. He lives on $3,200/month — a solid but not extreme lifestyle in a moderate cost-of-living city. His total invested per month is around $4,000, giving him a savings rate of approximately 55%.

Alex's FIRE number: $38,400/year × 25 = $960,000. But between his 401(k), Roth IRA, and taxable brokerage, he is investing $4,000/month. At 7% returns, he hits $960,000 in about 15 years — retiring at 42.

By keeping his lifestyle at $3,200/month despite a six-figure salary, Alex is on track for a genuinely early retirement at an age where he still has decades of healthy, active life ahead of him.

Scenario 3: Sam and Riley, Dual-Income Couple, Combined $180,000, Age 32

Sam and Riley together take home about $11,500/month. They live in a $2,800/month rental, spend $1,500/month on food and dining, $600 on transportation, and $1,200 on everything else — total spending of $6,100/month, or $73,200/year. They invest the remaining $5,400/month — a savings rate of 47%.

Their FIRE number: $73,200 × 25 = $1,830,000. Investing $5,400/month at 7% returns, they reach $1,830,000 in approximately 18 years — retiring at age 50.

If they buy a home and fix their housing cost at today's level (effectively removing rent inflation from the equation), or if one of them does occasional consulting work in retirement covering even $1,500/month, their portfolio math becomes significantly more comfortable.

The Role of Investment Returns

The examples above use 7% annual returns — a widely-cited conservative estimate for a diversified stock portfolio (the S&P 500 has averaged about 10% nominally, 7% after inflation, over long historical periods). But what if returns are higher or lower?

Annual Return	Years to FIRE at 50% Savings Rate	Years to FIRE at 30% Savings Rate
5%	~20 years	~33 years
7%	~17 years	~28 years
9%	~15 years	~24 years
10%	~14 years	~22 years

Returns matter — but they matter less than your savings rate. At a 50% savings rate, the difference between a 5% return and a 9% return is about 5 years. The difference between a 30% savings rate and a 50% savings rate at the same 7% return is about 11 years. Focus first on what you can control: your savings rate.

How to Accelerate Your Timeline

Beyond the savings rate itself, several strategies can meaningfully compress your FIRE timeline:

• Start with any existing savings. Even $50,000 already invested shaves 2–4 years off your journey at a 40% savings rate, because that money is already compounding on your behalf.
• Maximize tax-advantaged accounts first. Contributing to a 401(k), Roth IRA, and HSA before a taxable brokerage account means more of your money compounds tax-free or tax-deferred, which is equivalent to earning a higher effective return.
• Eliminate high-interest debt immediately. Carrying $15,000 in credit card debt at 22% interest is equivalent to a guaranteed 22% negative return on that portion of your balance sheet. Paying it off before investing is almost always the right move.
• Invest windfalls. Tax refunds, bonuses, and inheritances invested immediately can cut months or years off your timeline. A $10,000 bonus invested at 35, given 15 years to compound at 7%, becomes $27,590 by the time you retire.
• Consider geographic arbitrage. Moving to a lower cost-of-living area — even temporarily — can dramatically increase your savings rate without reducing your income.

Use the MyFIRE planner to model your specific numbers and see exactly where you stand on the timeline — including the impact of different savings rate assumptions, returns scenarios, and starting balances.