Savings Rate Calculator
Calculate your personal savings rate and estimate your FIRE number.
See how much of your income you're saving and how long until financial independence.
Your personal savings rate is the percentage of your income that you save or invest each month, after taxes. It is one of the most powerful predictors of financial independence timelines — far more impactful than investment returns alone.
Core formula: Savings Rate = (Income − Spending) ÷ Income × 100
Alternatively: Savings Rate = Savings ÷ Take-Home Income × 100
What each variable means:
- Income — use take-home (after-tax) income for the most meaningful calculation. This is what you actually have available to spend or save. Include all income sources.
- Spending — total monthly expenditures including fixed expenses (rent, loan payments) and variable (food, entertainment, subscriptions).
- Savings — the difference: amount directed to savings accounts, investments, retirement accounts (401k, IRA), debt payoff above minimums.
The savings rate / financial independence relationship: The mathematical relationship between savings rate and years to financial independence (at 4% safe withdrawal rate, 7% real investment return) is remarkably consistent:
| Savings Rate | Years to FI |
|---|---|
| 5% | ~66 years |
| 10% | ~51 years |
| 20% | ~37 years |
| 30% | ~28 years |
| 50% | ~17 years |
| 65% | ~10.5 years |
| 75% | ~7 years |
What to include in savings:
- Emergency fund contributions
- Brokerage account investments
- 401(k) contributions (including employer match)
- IRA contributions
- Extra mortgage principal payments
- HSA contributions
Worked example: Monthly take-home income: $5,200 Monthly expenses: $3,900 Monthly savings: $5,200 − $3,900 = $1,300
Savings Rate = $1,300 ÷ $5,200 × 100 = 25%
At 25% savings rate: expected FI timeline ≈ 32 years from now (adjusted for actual investment returns and spending in retirement).
Benchmark reference:
- US household average savings rate: ~4–6%
- Recommended minimum: 15% (basic retirement security)
- FIRE movement target: 50%+ (financial independence in 10–20 years)
- Best-in-class: 70%+ (financial independence in under 10 years)