Calculator
Savings Rate Calculator
Your savings rate is the single most powerful lever in FIRE — it simultaneously grows your investments and shrinks the portfolio you need. Move the slider and watch the math work.
Your numbers
After-tax income per year
$
35%
1%90%
You save: $35,000/yr
You spend: $65,000/yr
Existing invested assets
$
7.0%
3%12%
4.0%
2%6%
Years to Financial Independence
—
projected retirement year
—
annual savings
—
annual expenses
—
FIRE number
Savings rate → Years to FIRE
Your position is highlighted ●
Savings rate comparison
Based on your income. Highlighted row = your rate.
| Savings rate | Years to FIRE |
|---|
How it works
The double effect of a higher savings rate
1
Enter your annual take-home income
Use your after-tax income — the amount that actually hits your bank account each year. This is the base for all calculations.
2
Set your savings rate
Drag the slider to your current savings rate. Watch how dramatically the years to FIRE change — this is the most powerful lever in the entire FIRE equation.
3
Add your current savings
Existing savings give you a head start. Even a modest starting balance meaningfully shortens the timeline.
4
Adjust return and withdrawal rate
The defaults (7% real return, 4% SWR) match long-run historical averages. Adjust to explore conservative or optimistic scenarios.
5
Read the curve
The chart shows the relationship between savings rate and years to FIRE. Your position is highlighted. Notice how steeply the curve drops as savings rate rises past 30%.
Effect 1: more fuel
Annual savings = Income × savings rate A higher rate means more invested each year, accelerating growth.
Effect 2: smaller target
FIRE Number = Income × (1 − rate) ÷ SWR Higher savings → lower expenses → smaller FIRE number needed.
Frequently asked questions
Why does savings rate matter more than income?
A higher savings rate does two things simultaneously: it increases how much you invest each year AND it reduces the annual expenses your retirement portfolio needs to cover. Both effects compound. A 50% savings rate gets you to FIRE in roughly 17 years regardless of whether you earn $50k or $200k — the math is the same.
How is the savings rate calculated?
Savings rate = Annual Savings ÷ Annual Take-Home Income. If you earn $80,000 after tax and invest $24,000 per year, your savings rate is 30%. The remaining 70% ($56,000) becomes your annual expenses — and your FIRE number is $56,000 ÷ 0.04 = $1,400,000.
What counts as "savings" for this calculation?
Any money that gets invested counts: 401(k) contributions, IRA contributions, HSA contributions, taxable brokerage account deposits, and even extra mortgage principal payments if you count home equity in your net worth. Do not count money sitting in a checking or savings account unless it will be invested.
Why does the curve flatten out at high savings rates?
At a 75% savings rate you reach FIRE in about 7 years. At 80% it drops to about 5.5 years. The absolute gain is smaller because you are already close to the minimum possible timeline. The early part of the curve (going from 10% to 30%) has a far bigger impact on your timeline than going from 60% to 80%.
Is a 50%+ savings rate realistic?
For many people, yes — especially with two incomes, low housing costs, or above-average salaries. The FIRE community is full of households saving 50–70%. It typically requires intentional decisions on the three largest expenses: housing (house hacking, low-cost area), transport (no car payment, one car), and food (cooking at home). Small luxuries matter far less than these three.