This projects your balance at retirement from your current pace, then estimates the annual income it could safely support using the 4% rule. Adjust the sliders and watch the verdict update.
The "4% rule" assumes you withdraw 4% of your balance in year one, adjusted for inflation thereafter. It's a guideline, not a guarantee. Math runs locally in your browser.
The emerald curve is your projected balance; the grey line is the target nest egg needed to fund the income you chose (income ÷ 4%). If the curve clears the line by retirement, the verdict turns green.
If you're short, don't panic — try nudging the monthly contribution up by $100 and watch how much the gap closes. Because of compounding, contributions made in your 30s carry far more weight than the same dollars added in your 50s.