Savings Rate Calculator
Your savings rate is the most powerful variable in your FIRE plan. Calculate yours and see the exact number of years to financial independence — then watch how it changes as you tweak your income and spending.
Your Numbers
Real return: 3.9%
Savings rate benchmarks
These estimates assume a 7% real return, starting from $0, using the 4% withdrawal rule. Your actual timeline depends on your current savings and return rate.
| Savings Rate | Years to FI | Profile |
|---|---|---|
| 10% | ~43 yrs | Average saver |
| 25% | ~32 yrs | Above average |
| 40% | ~22 yrs | FIRE-focused |
| 50% | ~17 yrs | Classic FIRE |
| 65% | ~11 yrs | Aggressive FIRE |
| 75% | ~7 yrs | Extreme FIRE |
How this calculator works
Savings rate = (Income − Expenses) ÷ Income. With $80K income and $50K expenses: ($80K − $50K) ÷ $80K = 37.5%.
Years to FI is estimated by looping annually from your starting balance:
stop when balance ≥ FIRE number
Where the FIRE number = annual expenses ÷ withdrawal rate. The loop starts from your current portfolio (default $0) and terminates when you reach FI. All figures use real returns so dollar amounts stay in today's purchasing power.
The power of a high savings rate is that it attacks FI from both sides simultaneously: you save more and you need a smaller FIRE number (because your lower expenses mean you spend less in retirement too).
Frequently Asked Questions
Why does savings rate matter for early retirement?
Savings rate is the single most powerful lever in the FIRE equation. A 10% savings rate requires roughly 43 years to reach financial independence. A 50% savings rate cuts that to about 17 years. A 70% savings rate gets you there in around 8 years. The relationship is non-linear: doubling your savings rate more than halves your time to FI.
How is the savings rate calculated?
Savings rate = (Annual income − Annual expenses) ÷ Annual income, expressed as a percentage. If you earn $80,000 and spend $50,000, your savings rate is ($80,000 − $50,000) ÷ $80,000 = 37.5%. The calculator uses your take-home (after-tax) income for the most realistic result.
How is 'years to FI' estimated?
Starting from $0 savings, the calculator loops annually: balance = balance × (1 + r) + annual savings, until balance ≥ FIRE number (expenses ÷ withdrawal rate). This is a simplified projection that assumes a constant return each year and a fixed savings amount.
What return rate should I use?
For a US-based, stock-heavy portfolio, 7% real (inflation-adjusted) return is a common historical approximation. For a more conservative estimate using a mixed stock/bond portfolio or shorter time horizon, 5–6% is reasonable. This calculator uses real returns so the dollar figures stay in today's purchasing power.
Does this account for current savings?
The base 'years to FI' estimate starts from $0 to show the pure effect of your savings rate. Adjust the starting balance slider to reflect your current portfolio — it can dramatically reduce your timeline by showing how close you already are.