Retirement Calculator (4% Rule)
Use this calculator to estimate how much you may need for retirement and whether your current savings plan is on track.
Educational use only. Real-world planning should include taxes, inflation, fees, healthcare costs, and market volatility.
What Is the 4% Rule in Retirement?
The 4% rule is a simple retirement planning guideline: in your first year of retirement, you withdraw 4% of your portfolio, then adjust that dollar amount each year for inflation. It became popular because it gives people a practical starting point for answering one big question: “How much money do I need before I can retire?”
A quick shortcut from this rule is:
- Required portfolio ≈ annual spending need × 25
- Why 25? Because 4% is the same as dividing by 0.04, and 1 ÷ 0.04 = 25.
How This Retirement Calculator Works
This calculator uses the 4% framework and adds a projection of your future savings to show if you are currently ahead or behind your target.
Step 1: Estimate your spending gap
First, estimate how much you want to spend in retirement each year. Then subtract reliable income sources like Social Security or pension payments.
Spending gap = desired annual spending − guaranteed annual income
Step 2: Calculate required portfolio size
Next, divide your spending gap by your chosen withdrawal rate.
Required portfolio = spending gap ÷ withdrawal rate
If you use 4%, this is the same as multiplying by 25.
Step 3: Project your portfolio at retirement
The calculator compounds your current savings and future annual contributions using your expected return before retirement. This projection helps you compare your likely future balance with your required target balance.
Example of the 4% Rule
Suppose you want to spend $70,000 per year in retirement and expect $25,000 from Social Security.
- Spending gap: $70,000 − $25,000 = $45,000
- Required portfolio at 4%: $45,000 ÷ 0.04 = $1,125,000
That means you would target around $1.125 million in invested retirement assets to support your plan under the 4% rule assumptions.
Why the 4% Rule Is Useful (and Limited)
Why it helps
- Easy to understand and apply quickly.
- Good starting point for goal setting.
- Useful for comparing different retirement lifestyles.
What it does not capture perfectly
- Sequence of returns risk: bad market years early in retirement can hurt sustainability.
- Changing spending patterns: many retirees spend less in some years and more in others.
- Taxes and healthcare: large drivers of retirement outcomes that vary by household.
- Longevity uncertainty: retiring early may require a lower withdrawal rate than 4%.
Should You Use Exactly 4%?
Not always. Think of 4% as a baseline, not a law. Depending on your plan, a more conservative 3.0% to 3.5% withdrawal rate may be appropriate, especially if:
- You retire very early.
- You expect high market valuations and lower future returns.
- You want a larger safety margin.
On the other hand, some retirees can safely withdraw more than 4% if they have flexible spending, part-time income, or strong guaranteed income sources.
How to Improve Your Retirement Readiness
- Increase annual savings by even 1% to 2% of income.
- Delay retirement by one to three years for a large impact on portfolio longevity.
- Reduce fixed expenses before retirement to lower required withdrawals.
- Maintain diversified investments and low fees.
- Revisit your plan annually and adjust spending as needed.
Bottom Line
The retirement calculator 4 rule approach gives you a fast, practical benchmark: estimate spending, subtract reliable income, and divide by your withdrawal rate. That turns an abstract retirement goal into a concrete number you can plan around today.
Use this calculator as your first pass, then refine with a full retirement plan that includes inflation, taxes, healthcare, asset allocation, and contingency strategies.