Retirement Withdrawal Calculator Guide: Duration & Safe Rate
A complete overview of the Retirement Withdrawal Calculator — how long savings last, the safe withdrawal for a target duration, and the 4% rule shortcut.
Retirement planning has two sides: building the balance, and drawing it down without running out. This calculator covers the second half.
What it calculates
- How long will it last: starting balance + annual withdrawal + expected return + inflation → years until depletion, or "indefinitely" if real growth covers the withdrawal on its own.
- Find safe withdrawal: starting balance + target years → the maximum annual withdrawal that lasts exactly that long.
- 4% rule shortcut: one tap sets the withdrawal to 4% of the starting balance, the most commonly cited retirement withdrawal guideline.
Why it uses a real rate of return
Holding a withdrawal constant in inflation-adjusted terms — so it buys the same amount every year — requires modeling growth against a real (inflation-adjusted) rate, not the raw nominal return. The calculator converts your two inputs into that single rate automatically.
Still building toward this balance? Our Retirement / 401(k) Calculator covers the accumulation side of the same plan.