Savings Rate Calculator
The single most important number in FIRE: the share of your income you keep. See your savings rate and the years until financial independence, live.
Your savings rate is (take-home income − spending) ÷ take-home income, and it matters more than your return, because it sets both how fast the pot grows and how small the pot has to be. The page ships with $60,000 of take-home pay, $42,000 of spending and nothing invested yet: a 30% savings rate, $18,000 invested a year and a $1,050,000 target at a 4% withdrawal rate. This is the one tool on the site whose real return slider starts at 5% rather than 4%, a deliberate convention explained on how our calculators work. At 5% real it reports 27.7 years to independence; at 4% real the same savings rate takes 30.4 years. The withdrawal rate itself comes from Bengen's 1994 paper.
| Savings rate | Years to FI (from zero) |
|---|---|
| 10% | 51 yrs |
| 20% | 36.4 yrs |
| 30% | 27.7 yrs |
| 40% | 21.4 yrs |
| 50% | 16.4 yrs |
| 60% | 12.3 yrs |
| 70% | 8.7 yrs |
Why is your savings rate the whole game?
Your savings rate does double duty. Save more and you're not just investing more each month, you're also proving you can live on less, which shrinks the portfolio you need in the first place. That's why the relationship between savings rate and working years is so dramatic, and why it barely depends on how much you earn.
How does the math work?
Savings rate = (take-home − spending) ÷ take-home
FI target = annual spending × 25 (at a 4% withdrawal rate)
Years to FI = time for invested savings to compound to that target
We invest your annual savings monthly at your real return and count the years until your portfolio reaches your target, 25× spending at the default 4% withdrawal rate. Because everything is in today's money, you can read the results directly: "16 years from now, at this lifestyle."
How do you raise your savings rate?
- Attack the big three. Housing, transport and food are usually 60%+ of spending. One structural change (smaller place, cheaper car, fewer deliveries) beats a hundred small sacrifices.
- Bank every raise. Keep lifestyle flat and your savings rate climbs automatically, without feeling poorer.
- Mind the gap, not just the rate. Earning more with spending flat has exactly the same effect as cutting, and it's unbounded.
Frequently asked questions
Should I use gross or take-home income?
Take-home (after tax). It keeps the math honest, you can only save or spend what actually lands in your account. Count employer pension/401(k) contributions as savings if you want the full picture: add them to both income and savings.
Is a 50% savings rate realistic?
On a median salary it's hard; on a high salary or two incomes it's common in the FIRE community. Even moving from 10% to 25% cuts your working years by roughly half, every point counts.
Why does this calculator default to a 5% real return?
It is a deliberate convention and the one place on this site where the default real return is not 4%. This tool is showing the shape of the savings rate to years relationship rather than sizing a portfolio, so it keeps its own slider. At 5% real with a 4% withdrawal rate, a 30% savings rate reaches financial independence from zero in 27.7 years; at 4% real the same rate takes 30.4 years. Move the slider to 4% and the table redraws to match the rest of the site. The reasoning is set out on how our calculators work.
What if I already have investments?
Enter them under "Already invested", they give you a head start, and the calculator shortens your years-to-FI accordingly.
More FIRE calculators
Sources and further reading
The figures and rules on this page rest on the sources below, so you can check them rather than take our word for it.
- Bengen, W. P., Determining Withdrawal Rates Using Historical Data, Journal of Financial Planning, 1994 (FPA reprint, March 2004, member access), the origin of the 4% rule
- Vanguard, How America Saves, on how people actually contribute and invest
- How our calculators work, the formulas, defaults and tax year 2026 constants behind every figure on this site