How the 4% Rule Calculator Works
The 4% rule is a classic retirement planning guideline: withdraw 4% of your portfolio in year one, then increase that dollar amount each year by inflation, regardless of market performance.
This safe withdrawal rate calculator computes:
- Initial Annual Withdrawal — your first year’s withdrawal amount
- Initial Monthly Withdrawal — the monthly equivalent
- Inflation-Adjusted Withdrawal in Final Year — what you’ll withdraw by the end
- Projected Ending Balance — what’s left after your retirement period
4% Rule Formula
Year 1 Withdrawal = Portfolio Value × Withdrawal Rate
Each Subsequent Year’s Withdrawal = Prior Year’s Withdrawal × (1 + Inflation Rate)
Portfolio Balance = (Prior Balance − Withdrawal) × (1 + Expected Return)
4% Rule Examples
Example 1: Classic 4% Rule
| Variable | Value |
|---|---|
| Portfolio Value | $1,000,000 |
| Withdrawal Rate | 4% |
| Inflation Rate | 3% |
| Expected Return | 6% |
| Retirement Years | 30 |
| Initial Annual Withdrawal | $40,000 |
Example 2: More Conservative 3.5% Rate
| Variable | Value |
|---|---|
| Portfolio Value | $750,000 |
| Withdrawal Rate | 3.5% |
| Inflation Rate | 2.5% |
| Expected Return | 6% |
| Retirement Years | 35 |
| Initial Annual Withdrawal | $26,250 |
Who Benefits from the 4% Rule Calculator?
This safe withdrawal rate calculator is designed for:
- Pre-retirees planning how much they can spend annually in retirement
- Retirees evaluating whether their current withdrawal rate is sustainable
- FIRE (Financial Independence, Retire Early) followers stress-testing longer retirement horizons
- Financial planners modeling client withdrawal strategies
Frequently Asked Questions
What is the 4% rule?
The 4% rule is a retirement withdrawal guideline suggesting that withdrawing 4% of your portfolio in the first year of retirement, then adjusting that dollar amount for inflation each subsequent year, has historically had a high probability of lasting 30 years without depleting the portfolio.
Is the 4% rule still considered safe?
The 4% rule remains a widely used starting point, though many financial planners now suggest a more conservative rate (around 3-3.5%) given current market valuations, longer lifespans, and lower expected future returns, or recommend a flexible, dynamic withdrawal strategy instead.
How does the withdrawal amount change over time?
Under the classic 4% rule, the dollar amount of your withdrawal increases each year by the inflation rate, keeping your purchasing power constant regardless of portfolio performance.
What happens if the market drops significantly?
The classic 4% rule doesn’t adjust for market downturns, which is a key criticism — some retirees use more flexible strategies that reduce withdrawals during down markets to improve portfolio longevity.
Is my data stored anywhere?
No. All calculations run locally in your browser. No data is sent to any server.