The 4% rule is the most famous shorthand in retirement planning: it says you can withdraw about 4% of your starting balance in the first year, adjust that amount for inflation each year, and have a high chance of your money lasting 30 years. Flip it around and it becomes a target — you need roughly 25× your annual spending saved.
This calculator leads with that target. Tell it what you want to spend, and it shows the nest egg the 4% rule implies, with the 25× cross-check alongside.
Where the 4% rule comes from
It traces to the 1990s “Trinity study,” which tested historical 30-year retirements across U.S. stock and bond returns. A 4% initial withdrawal, rising with inflation, survived almost every historical period with a balanced portfolio — hence the rule. The 25× target is just its mirror image: 1 ÷ 0.04 = 25.
So for $60,000 of annual spending, the rule points to a $1.5 million nest egg. If Social Security or a pension covers part of that spending, your own savings only need to fund the remainder — which is why your real target is often much lower.
The rule’s limitations
It’s a guideline, not a guarantee. It was built on a 30-year horizon and U.S. history; early retirees planning for 40+ years, or anyone expecting lower future returns, may want a more conservative 3.0–3.5%. Today’s valuations and bond yields differ from the past, and the rule ignores taxes and fees.
It’s also rigid: real retirees adjust. Spending a little less in down markets — rather than mechanically raising withdrawals with inflation — dramatically improves the odds. Treat 4% as a sensible anchor, then flex.
Using a different rate
Lower the withdrawal rate in the assumptions and the target nest egg rises: at 3.5% you need about 28.6× spending; at 5% just 20×. Higher rates demand a smaller pot but carry more risk of running out, especially over long retirements.
There’s no universally correct number — it’s a trade-off between the size of the nest egg you need and the safety margin you want. The calculator makes that trade-off visible so you can choose deliberately.
Frequently asked questions
What is the 4% rule?
It’s a guideline that you can withdraw about 4% of your starting retirement balance in year one, adjust that dollar amount for inflation each year, and likely not run out over 30 years. It implies a target of roughly 25× your annual spending.
How much do I need to retire using the 4% rule?
About 25× the annual spending your savings must cover. For $60,000 a year that’s $1.5 million — but if Social Security covers part of your spending, your own savings target is lower. Enter your numbers above to see it.
Is the 4% rule still safe?
It’s a reasonable anchor, but it’s not a guarantee. It assumes a 30-year retirement and U.S. historical returns; long early retirements or lower expected returns may warrant 3.0–3.5%. Flexibility in down years improves the odds.
How do I calculate a safe withdrawal amount?
Multiply your balance by your chosen rate: 4% of $1 million is $40,000 in year one, rising with inflation thereafter. Adjust the rate in the assumptions to be more cautious or aggressive.