What percentage of your take-home income are you actually saving? Enter your monthly income and expenses to instantly see your savings rate, monthly and annual savings, and how many years you are from financial independence under the 4% rule.
Income: $5,000/mo · Expenses: $3,500/mo · Savings: $1,500/mo · Return: 7% · Current savings: $0
Monthly Savings = $5,000 − $3,500 = $1,500
Savings Rate = $1,500 ÷ $5,000 × 100 = 30%
Annual Savings = $1,500 × 12 = $18,000 · Annual Expenses = $3,500 × 12 = $42,000
FI Target = $42,000 × 25 = $1,050,000
Years to FI = ln((1,050,000 × 0.07 + 18,000) ÷ 18,000) ÷ ln(1.07) ≈ 24.0 years
Income: $4,000/mo · Expenses: $4,800/mo · Savings: −$800/mo
Monthly Savings = $4,000 − $4,800 = −$800 (you are spending $800 more than you earn)
Savings Rate = −$800 ÷ $4,000 × 100 = −20%
Annual Expenses = $4,800 × 12 = $57,600 → FI Target = $1,440,000
Years to FI = — (annual savings are negative, so your portfolio never grows toward FI)
Note: a negative rate means you are drawing down savings or adding debt every month. Building an emergency fund and cutting expenses should be the priority.
Income: $6,000/mo · Expenses: $2,400/mo · Savings: $3,600/mo · Return: 7% · Current savings: $0
Monthly Savings = $6,000 − $2,400 = $3,600
Savings Rate = $3,600 ÷ $6,000 × 100 = 60%
Annual Expenses = $2,400 × 12 = $28,800 → FI Target = $720,000
Annual Savings = $43,200
Years to FI = ln((720,000 × 0.07 + 43,200) ÷ 43,200) ÷ ln(1.07) ≈ 11.4 years
Income = Monthly take-home (net) income
Expenses = Monthly spending on everything
Income − Expenses = Monthly savings
Annual savings = monthly savings × 12 · Annual expenses = monthly expenses × 12
r = Assumed annual return (default 7%)
Current Savings = What you have invested today (default $0)
The 4% rule says you can safely withdraw 4% of your portfolio per year in retirement — so you need 25× your annual expenses (100 ÷ 4 = 25).
Income must be greater than 0: the calculator rejects zero or negative income.
Negative savings rate: if expenses exceed income, the rate displays as a negative percentage (e.g., −20%).
Return rate limits: r must be between 0% and 30%.
FI guard: if current savings × r + annual savings ≤ 0, or the FI target is not positive, Years to FI shows "—".
0% return: with no investment growth, Years to FI = FI target ÷ annual savings (simple division).
The single most important number in personal finance: what percentage of your take-home income you keep. Most people guess 10–20% higher than reality — this calculator removes the guesswork.
See exactly how much money you keep each month and each year. Annualizing your savings makes it concrete — $500/month is $6,000/year, which most people find motivating.
Your financial independence number: 25× your annual expenses. Once your investments reach this amount, the 4% rule says you can theoretically live off them forever.
A realistic projection of how many years it takes your savings — growing at your assumed return — to reach your FI target. Tweak the return rate and current savings to see what changes.
Your savings rate — the percentage of take-home income you keep — is the single strongest predictor of how quickly you reach financial independence. It matters more than how much you earn. Two people with identical expenses and identical savings rates reach FI at the same time, even if one earns twice as much as the other.
This is why a high earner with expensive tastes can be decades behind a modest earner who saves aggressively. The calculator above shows the connection directly: bump your savings rate from 10% to 20% and your years to FI drops by roughly a decade. That is far more powerful than chasing a raise that mostly gets spent.
Assumes a 7% annual return and starting from $0 in savings. Based on the 4% rule (FI target = 25× annual expenses).
| Savings Rate | Monthly Savings ($5k/mo income) | Approx. Years to FI |
|---|---|---|
| 5% | $250 | ≈ 52 years |
| 10% | $500 | ≈ 42 years |
| 15% | $750 | ≈ 35 years |
| 20% | $1,000 | ≈ 31 years |
| 30% | $1,500 | ≈ 24 years |
| 40% | $2,000 | ≈ 19 years |
| 50% | $2,500 | ≈ 15 years |
| 60% | $3,000 | ≈ 11 years |
The 4% rule is a famous retirement planning guideline. It says that if you withdraw 4% of your investment portfolio in your first year of retirement (adjusting for inflation after that), your money has a very high probability of lasting 30 years or more, based on historical market data.
Working backwards, that means your FI number is 25× your annual expenses: $100 ÷ 4 = 25. If you spend $42,000 a year, you need roughly $1,050,000 invested before you can call yourself financially independent. The "Years to FI" card in this calculator projects how long that takes given your savings rate, your current savings, and your assumed return.
| Annual Expenses | FI Target (25× Expenses) | Monthly Withdrawal (4%) |
|---|---|---|
| $24,000 | $600,000 | $2,000 |
| $36,000 | $900,000 | $3,000 |
| $42,000 | $1,050,000 | $3,500 |
| $60,000 | $1,500,000 | $5,000 |
| $80,000 | $2,000,000 | $6,667 |
Notice the leverage: every dollar of annual expenses you cut reduces your FI target by $25. Cutting $200/month ($2,400/year) shrinks your FI number by $60,000 — often worth far more than a raise.
The savings rate formula has exactly two levers: increase income, decrease expenses — or both. You do not need to eat rice and beans to make meaningful progress; even moving from 5% to 15% shaves years off your FI timeline. These are the highest-leverage moves, roughly in order:
Run the calculator, pick a target savings rate, and check the Years to FI card — watching the number fall as your rate rises is one of the most motivating charts in personal finance.
Educational Purposes Only: This savings rate calculator is provided for educational and informational purposes only. Results are estimates based on the information you provide and standard financial formulas. The 4% rule, assumed returns, and FI projections are planning guidelines based on historical data — not guarantees of future performance. Investment returns fluctuate, taxes and inflation affect real outcomes, and individual circumstances differ. This tool does not constitute financial, investment, or tax advice. Always consult with a qualified financial professional before making important financial decisions.