retirementintermediate8 min

4% Rule Calculator

Calculate how much you can safely withdraw from your retirement portfolio using the 4% rule. See how different withdrawal rates affect portfolio longevity.

Enter Your Details

Portfolio Size

Annual Withdrawal Rate

Expected Retirement Length

years

Expected Portfolio Return

Inflation Rate

Annual Withdrawal Amount

Full Results

Monthly Withdrawal Amount

Portfolio Longevity

Final Portfolio Value

Total Withdrawn

Estimated Success Rate

Sustainable Rate for Your Timeline

What is 4% Rule Calculator?

The 4% rule calculator estimates how much you can safely withdraw from your retirement portfolio and how long your money will last based on historical return patterns.

How It Works

Enter your portfolio size, desired withdrawal rate, and retirement timeline. The calculator projects your portfolio balance over time, adjusting for returns and inflation.

The Formula

Annual Withdrawal = Portfolio × Withdrawal Rate
Portfolio Balance = Previous Balance × (1 + r) - Annual Withdrawal × (1 + i)^t
Where r = return rate, i = inflation rate, t = years

The 4% rule was derived from the Trinity Study, which found that a 4% initial withdrawal rate (adjusted for inflation) had a high success rate over 30-year retirements. Lower rates extend longevity, higher rates increase risk.

Examples

Example: $1,000,000 portfolio at 4% withdrawal

30-year retirement, 7% returns, 3% inflation

You can withdraw $40,000 your first year ($3,333/month), increasing with inflation each year. After 30 years, your portfolio would still have $1,476,364, giving this plan a 96%+ estimated success rate based on historical data.

Pros & Cons

Pros

✓Based on academic research
✓Simple, easy-to-use guideline
✓Accounts for inflation
✓Adjustable for different scenarios

Cons

✗Past performance ≠ future results
✗Doesn't guarantee success
✗Sequence of returns risk not fully captured
✗4% may not apply to early retirement

Common Mistakes to Avoid

!Using too high a withdrawal rate
!Not adjusting for inflation
!Ignoring sequence of returns risk
!Applying 4% to short retirements

Expert Tips

★Use 3-3.5% for early retirement (50+ years)
★Be flexible with spending in down markets
★Consider a variable withdrawal strategy
★Re-evaluate annually and adjust

Frequently Asked Questions

What is the 4% rule?

The 4% rule is a retirement withdrawal guideline from the Trinity Study (1998). It suggests withdrawing 4% of your portfolio in your first retirement year, then adjusting that dollar amount for inflation each year. It was designed for 30-year retirements.

Is the 4% rule still valid?

The 4% rule is debated. Some argue it's too conservative given low bond yields. Others say it's too aggressive for 50+ year retirements (FIRE). Many now use 3-3.5% for early retirement. It's a guideline, not a guarantee.

How does retirement length affect the safe withdrawal rate?

The longer your retirement, the lower your safe withdrawal rate. For 30 years, 4% works. For 40 years, 3.5% is safer. For 50+ years, 3-3.25% is more appropriate. Early retirees should use lower rates.

What is sequence of returns risk?

Sequence of returns risk is the danger of experiencing poor investment returns early in retirement when you're withdrawing money. A market downturn in your first few years can significantly reduce portfolio longevity, even if average returns are good.

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