🏖️ Retirement Withdrawal Calculator (4% Rule)
By ToolNimba Finance Team · Reviewed by ToolNimba Editorial Review, personal finance content · Updated 2026-06-19
This calculator gives a simple estimate based on a fixed withdrawal rate and is not financial advice. It does not model inflation year by year, taxes, investment fees, sequence-of-returns risk, market crashes, or a guarantee that your money will last. Real outcomes depend on how your portfolio performs and how long your retirement lasts. Talk to a qualified financial adviser before making any retirement decision.
This retirement withdrawal calculator shows how much income a portfolio can produce under the well-known 4% rule, or any safe withdrawal rate you choose. Enter your portfolio value and a rate to see the annual, monthly, and weekly amount you could withdraw. Switch to the reverse mode to find the portfolio you would need to fund a target annual income. It is a fast sanity check for retirement planning and FIRE goals.
What is the Retirement Withdrawal Calculator?
The 4% rule is a simple guideline for how much you can spend from a retirement portfolio each year without running out of money too soon. It comes from the Trinity study and earlier work by financial planner William Bengen in the 1990s, which looked at historical US stock and bond returns and asked how much a retiree could withdraw over a 30-year retirement with a high chance of success. The answer they landed on was about 4% of the starting portfolio in the first year, adjusted upward for inflation each year after that.
The core arithmetic is deliberately easy. Your first-year withdrawal is simply the portfolio value multiplied by the withdrawal rate: a $1,000,000 portfolio at a 4% rate gives $40,000 for the year, which is about $3,333 a month. You can run it in reverse too: to draw a chosen income, divide that income by the rate. To get $40,000 a year at 4%, you would need $40,000 ÷ 0.04 = $1,000,000 invested. This reverse view is the basis of the FIRE movement's '25x rule', because 1 ÷ 0.04 = 25, so you aim for 25 times your annual spending.
The rule is a starting point, not a promise. It assumes a roughly 30-year horizon, a diversified stock-and-bond mix, and that you ignore taxes and fees in the headline number. A longer retirement, a more cautious portfolio, or a run of poor early returns (called sequence-of-returns risk) can all argue for a lower rate such as 3% or 3.5%. Many retirees also stay flexible, trimming spending in down markets rather than withdrawing a rigid amount. Use the calculator to compare rates and see how sensitive your income is to the assumption you pick.
When to use it
- Estimating how much annual and monthly income a retirement nest egg could safely provide.
- Working out your FIRE number: the portfolio you need to retire on a target annual budget.
- Comparing a 3%, 3.5%, 4%, and 5% withdrawal rate to see how much each one changes your income.
- Sanity-checking whether your current savings are on track for the lifestyle you want in retirement.
How to use the Retirement Withdrawal Calculator
- Choose a mode: "Portfolio to income" to turn savings into spending, or "Income to portfolio" to find the savings you need.
- In portfolio mode, enter your total retirement portfolio value.
- In income mode, enter the annual income you want to draw.
- Set the safe withdrawal rate (the default 4% follows the classic rule).
- Read off the annual, monthly, and weekly figures, then try different rates to test your plan.
Formula & method
Worked examples
You have a $1,000,000 portfolio and use the classic 4% withdrawal rate.
- Annual = 1,000,000 × (4 ÷ 100) = 1,000,000 × 0.04
- Annual = $40,000
- Monthly = 40,000 ÷ 12 = $3,333.33
- Weekly = 40,000 ÷ 52 = $769.23
Result: About $40,000 a year, or $3,333.33 a month, in the first year.
You want $50,000 a year in retirement and plan to use a cautious 3.5% rate.
- Portfolio = income ÷ (rate ÷ 100)
- Portfolio = 50,000 ÷ (3.5 ÷ 100) = 50,000 ÷ 0.035
- Portfolio = $1,428,571.43
Result: You would need roughly $1,428,571 invested to draw $50,000 a year at 3.5%.
First-year withdrawal from a $1,000,000 portfolio at different safe withdrawal rates
| Withdrawal rate | Annual income | Monthly income | Implied multiple |
|---|---|---|---|
| 3.0% | $30,000 | $2,500.00 | 33.3× |
| 3.5% | $35,000 | $2,916.67 | 28.6× |
| 4.0% | $40,000 | $3,333.33 | 25.0× |
| 4.5% | $45,000 | $3,750.00 | 22.2× |
| 5.0% | $50,000 | $4,166.67 | 20.0× |
Portfolio needed to fund a target annual income (the reverse calculation)
| Annual income | At 3% (33.3×) | At 4% (25×) | At 5% (20×) |
|---|---|---|---|
| $30,000 | $1,000,000 | $750,000 | $600,000 |
| $40,000 | $1,333,333 | $1,000,000 | $800,000 |
| $60,000 | $2,000,000 | $1,500,000 | $1,200,000 |
| $80,000 | $2,666,667 | $2,000,000 | $1,600,000 |
Common mistakes to avoid
- Treating the 4% rule as a guarantee. The rule is based on historical US returns over a 30-year horizon, not a promise. A longer retirement, a poor run of early returns, or a very conservative portfolio can all mean 4% is too much. It is a planning yardstick, not a lifetime warranty.
- Forgetting taxes and fees. The withdrawal figure here is gross. Income tax on withdrawals and ongoing investment or adviser fees both reduce what actually reaches your bank account, so your spendable amount is lower than the headline number.
- Ignoring inflation over time. The classic rule sets the first-year amount, then raises it each year for inflation. This calculator shows the first-year figure only. Over a long retirement the dollar amount you withdraw should grow, even though the percentage of the original portfolio stays fixed.
- Confusing the withdrawal rate with the investment return. A 4% withdrawal rate is not the same as earning 4%. The rate is what you take out; your portfolio still needs to grow enough on average to support those withdrawals plus inflation over the years.
Glossary
- Safe withdrawal rate
- The percentage of your starting portfolio you withdraw in the first year, chosen so the money is likely to last your full retirement.
- 4% rule
- A guideline that withdrawing about 4% of your portfolio in year one, then adjusting for inflation, has historically lasted a 30-year retirement.
- 25x rule
- The reverse of the 4% rule: aim to save 25 times your annual spending, since 1 ÷ 0.04 = 25.
- FIRE
- Financial Independence, Retire Early: a movement built around saving a large multiple of annual spending so investment income can cover living costs.
- Sequence-of-returns risk
- The danger that poor investment returns early in retirement, combined with withdrawals, permanently shrink a portfolio even if average returns are fine.
Frequently asked questions
What is the 4% rule in retirement?
The 4% rule says you can withdraw about 4% of your retirement portfolio in the first year, then increase that dollar amount with inflation each year, with a high historical chance of the money lasting a 30-year retirement. On a $1,000,000 portfolio that is $40,000 in the first year.
How much do I need to retire?
Using the 4% rule, you need roughly 25 times your desired annual spending. For $40,000 a year that is $1,000,000, and for $60,000 a year it is $1,500,000. Switch this tool to "Income to portfolio" mode and enter your target income to see the figure for any rate.
Is the 4% rule still safe?
It remains a popular starting point, but some analysts argue lower future returns or a longer retirement justify a more cautious 3% to 3.5% rate. Others note that flexible spending, trimming in bad years, can support a slightly higher rate. Test several rates here to see the trade-off.
How is the monthly withdrawal calculated?
The calculator first finds the annual withdrawal as portfolio multiplied by the rate, then divides by 12 for the monthly figure and by 52 for a weekly figure. So $40,000 a year is about $3,333.33 a month.
Does this calculator account for inflation and taxes?
No. It shows a simple first-year, gross figure based on a fixed rate. The classic rule raises the dollar amount for inflation in later years, and your spendable income will be lower after income tax and any investment fees.
What withdrawal rate should I use?
Many people start with 4% as a benchmark. A longer retirement, an early retirement, or a cautious portfolio may favour 3% to 3.5%, while a shorter horizon or willingness to cut spending in downturns might support more. There is no single correct number, so consider advice for your own situation.
Sources
- What Is the 4% Rule for Withdrawals in Retirement? , Investopedia
- Planning for retirement income , U.S. Consumer Financial Protection Bureau