FINANCIAL · SAVINGS RATE
Savings Rate Calculator
Calculate your savings rate as a percentage of gross or net income, and see how many years you need to reach financial independence.
About This Calculator
Find out what percentage of your income you're saving and how that rate translates into years until financial independence. Enter your gross income and annual savings to see your savings rate instantly. Add your current portfolio and a real return rate to project your years-to-FI based on the 4% safe withdrawal rule.
How It Works
Your gross savings rate is simply your annual savings divided by your gross income, expressed as a percentage. If you also enter your net (after-tax) take-home pay, the calculator shows a net savings rate too — useful when comparing to personal finance benchmarks that use take-home pay as the base. The years-to-FI projection uses the same compound-growth formula as the FIRE calculator: your savings grow each year at the specified real return rate, and the target is your annual spending divided by 4% (the classic safe withdrawal rate = 25× annual expenses).
The Formula
Rate = savings ÷ income × 100 FI # = spending ÷ 0.04 P(n) = P₀ × (1+r)ⁿ + C × [(1+r)ⁿ − 1] / r
- Rate
- savings as a percentage of income
- FI #
- financial independence number (25× annual spending)
- P(n)
- portfolio value at year n
- P₀
- current portfolio / invested savings
- r
- annual real return rate (inflation-adjusted, as decimal)
- n
- number of years from today
- C
- annual savings / contributions
Frequently Asked Questions
- What is a good savings rate?
- Most personal finance experts recommend saving at least 15–20% of gross income for a traditional retirement at 65. If you want to retire early (FIRE movement), a savings rate of 30–50%+ significantly shortens the timeline. At a 50% savings rate and a 5% real return, you can reach financial independence in roughly 16–17 years. The higher your savings rate, the less you spend (reducing your FI number) and the faster you accumulate assets.
- What is the difference between gross and net savings rate?
- Your gross savings rate uses pre-tax income as the denominator — the number you earn before taxes and deductions. Your net savings rate uses take-home (after-tax) pay. Pre-tax 401k contributions count as savings but don't appear in take-home pay, so the net rate can exceed 100% in theory. Most FIRE-community calculations use gross income for consistency, but some bloggers use net income — knowing which base a benchmark uses matters when comparing.
- How does the years-to-FI calculation work?
- The calculator uses the classic FIRE formula with a 4% safe withdrawal rate (the 25× rule). Your FI number equals 25 times your annual spending. Starting from your current portfolio, the calc projects year-by-year growth at your chosen real (inflation-adjusted) return rate while adding your annual savings, until the balance reaches the FI number. Real return means inflation-adjusted — a 7% nominal return with 3% inflation is approximately 4% real.
- What real return rate should I use?
- A real (inflation-adjusted) return of 4–7% is a common range for a diversified equity/bond portfolio. The famous Trinity Study used historical US equity/bond data suggesting ~7% nominal, ~4–5% real over long periods. Conservative planners use 4–5% real; moderate planners use 5–7%. The specific number matters less than your savings rate for most scenarios — a higher savings rate both reduces the FI number and builds the portfolio faster.
- What are the limitations of this calculator?
- This tool assumes a constant annual return (no sequence-of-returns risk), stable income and spending, and the standard 4% SWR. Real-world results will differ due to market volatility, tax-advantaged account sequencing, changing life expenses, and other factors. This is a long-term planning reference only — not financial advice.