Retirement Withdrawal Calculator
Determine a safe monthly withdrawal amount from your retirement savings based on your balance, expenses, and chosen withdrawal strategy. Use it to check whether your nest egg can support your lifestyle for a 30-year retirement.
About this calculator
The calculator supports two approaches. For a fixed-rate strategy (e.g., the classic 4% rule), the monthly withdrawal is simply: Monthly = Balance × (rate% / 100) / 12. For a custom expense-based strategy, the calculator solves for the present surplus after funding 30 years of inflation-adjusted expenses: Surplus = Balance − [monthlyExpenses × 12 × ((1 + i)³⁰ − 1) / i] / (1 + r)³⁰, where i = inflationRate/100 and r = investmentReturn/100. A positive surplus means your savings can cover projected expenses; a negative number signals a funding gap. The 4% rule, popularized by the Trinity Study, suggests most balanced portfolios can sustain 30-year retirements at that withdrawal rate.
How to use
Using the 4% rule with a $1,000,000 balance: Monthly withdrawal = $1,000,000 × (4 / 100) / 12 = $40,000 / 12 = $3,333/month. For the custom strategy with $4,000/month expenses, 6% return, and 3% inflation over 30 years: PV of expenses = $4,000 × 12 × ((1.03³⁰ − 1) / 0.03) / 1.06³⁰ ≈ $48,000 × 47.58 / 5.74 ≈ $398,000. Surplus = $1,000,000 − $398,000 = $602,000, indicating the balance is more than sufficient.
Frequently asked questions
What is the 4% rule and is it still a reliable retirement withdrawal guideline?
The 4% rule states that retirees can withdraw 4% of their initial portfolio value annually (adjusted for inflation each year) with a high probability of not outliving their money over a 30-year retirement. It originated from the 1994 Trinity Study using historical US stock and bond returns. Some financial planners now suggest 3–3.5% may be more prudent given lower expected bond returns and longer life expectancies, but 4% remains a widely used starting benchmark.
How does inflation affect how long my retirement savings will last?
Inflation erodes the purchasing power of each dollar you withdraw. A 3% annual inflation rate means $4,000 in monthly expenses today will feel like $9,700 in 30 years in nominal terms. If your withdrawals don't keep pace with inflation, your real standard of living declines steadily. This is why retirement planning models always include an inflation adjustment — either by increasing withdrawals annually or by projecting the present value of future expense streams.
When should I consider using a dynamic rather than fixed withdrawal strategy in retirement?
A dynamic strategy — where you reduce withdrawals in down markets and increase them in good years — is worth considering if your retirement spending is flexible. Research shows dynamic strategies can significantly reduce the risk of portfolio depletion compared to fixed-dollar withdrawals, especially in early-retirement bear markets (known as sequence-of-returns risk). If a large portion of your expenses are fixed (rent, healthcare), a baseline floor from Social Security or an annuity should cover non-discretionary costs before applying any dynamic rule.