Retirement Withdrawal Calculator

How It Works

The Retirement Withdrawal Calculator helps you determine how many years your retirement savings will last based on a fixed annual withdrawal amount and your portfolio's expected investment returns. This is essential for retirement planning because it shows whether your nest egg can sustain your lifestyle throughout retirement, or if you need to adjust your spending or savings strategy. This tool is designed for both quick estimates and detailed planning scenarios. Results update instantly as you adjust inputs, making it easy to compare different approaches and understand how each variable affects the outcome. For best accuracy, use precise measurements rather than rough estimates, and consider running multiple scenarios to establish a realistic range of expected results.

The Formula

Variables

• Portfolio Balance — Your starting retirement savings amount in dollars — the total value of investments (401k, IRA, brokerage accounts, etc.) you'll draw from during retirement
• Annual Withdrawal — The fixed dollar amount you plan to withdraw each year to cover living expenses, typically stated as your first-year withdrawal amount
• Annual Return — The expected annual percentage return on your remaining portfolio investments — for example, 5% for a balanced portfolio or 7% for stock-heavy allocations
• Inflation-Adjust Withdrawals — A yes/no option that increases your annual withdrawal by inflation each year to maintain purchasing power; if no, withdrawals stay flat in dollar terms
• Years Portfolio Lasts — The output showing how many years your portfolio will sustain your withdrawal amount before depleting to zero
• Total Withdrawn — The cumulative dollar amount you will have withdrawn across all years before the portfolio is exhausted

Worked Example

Let's say you retire with a $500,000 portfolio, plan to withdraw $25,000 annually, expect your investments to return 6% per year, and want inflation-adjusted withdrawals. In year 1, your portfolio grows to $530,000 (500,000 × 1.06), then you withdraw $25,000, leaving $505,000. In year 2, that $505,000 grows to $535,300, but you now withdraw $25,750 (the original $25,000 increased by, say, 3% inflation), leaving $509,550. The calculator continues this process year by year, tracking when your balance reaches zero. If the portfolio lasts 35 years, you'd know your money should carry you from age 65 to 100, and you'd see the total amount withdrawn (approximately $1,050,000+ depending on inflation rates).

Practical Tips

• Use a conservative return estimate — historical stock market returns average 10%, but a balanced portfolio (60% stocks, 40% bonds) more realistically returns 5–7%. A lower assumption protects you from market downturns early in retirement.
• Test multiple withdrawal amounts to find your comfort zone — try $20,000, $25,000, and $30,000 annually to see which extends your portfolio longest, then decide what aligns with your lifestyle needs.
• Enable inflation adjustment if you're planning more than 10 years ahead — without it, your purchasing power shrinks, meaning $25,000 in year 20 buys far less than $25,000 today; inflation-adjusted withdrawals keep your real spending steady.
• Rebalance annually and revisit this calculation every few years — if markets perform better than expected, you might withdraw more; if worse, you may need to reduce spending to extend your portfolio's runway.
• Account for major expenses separately — if you expect a large one-time cost (home repair, medical procedure, travel), either increase the annual withdrawal temporarily or reduce your base withdrawal to create a buffer.

Last updated: April 02, 2026 · Reviewed by the CalcSuite Editorial Team · About our methodology