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What does this calculator estimate?
At $1,000,000 and a 4% rate, this calculator shows a $40,000 first-year withdrawal and a $3,333.33 monthly equivalent ($40,000 divided by 12). It applies a percentage to the entered balance; it does not estimate investment performance, inflation-adjusted spending, or how long savings will last.
- Annual amount = portfolio value × withdrawal rate ÷ 100; at $1,000,000 and 4%, that is $40,000. (BoringToolsKit formula)
- Monthly equivalent = annual amount ÷ 12; $40,000 ÷ 12 = $3,333.33, rounded to cents. (BoringToolsKit formula)
- The result is arithmetic, not a sustainability estimate or individualized financial advice. (BoringToolsKit formula)
How the first-year amount is calculated
Enter a portfolio value of $1,000,000 and a withdrawal rate of 4%. The calculator multiplies $1,000,000 by 4 and divides by 100 to produce $40,000 for the first-year amount. Dividing $40,000 by 12 gives a monthly equivalent of $3,333.33. The monthly figure is a simple average, not a month-by-month withdrawal schedule.
At the same balance, 3.5% produces $35,000 annually and 4.5% produces $45,000. Each 0.5 percentage-point change alters the initial arithmetic by $5,000 per year. This comparison does not show that any one rate is safe or sustainable.
What this calculator does not model
The calculation does not include investment gains or losses, inflation adjustments, taxes, fees, cash reserves, withdrawal timing, or a time horizon. A flat monthly equivalent can therefore differ from actual spending power and portfolio outcomes.
A withdrawal-rate result alone cannot determine whether savings will last. This calculator does not estimate sustainability; it reports only the arithmetic for the entered balance and rate. For a year-by-year projection, use a model that lists its return, inflation, fee, tax, and withdrawal assumptions. This calculator is arithmetic only, not individualized financial advice.
How this calculator works
Formula
annual withdrawal = portfolio value × withdrawal rate / 100; monthly equivalent = annual withdrawal / 12
Worked example
$1,000,000 × 4 / 100 = $40,000 for the first year; $40,000 / 12 = $3,333.33 per month (rounded to cents).
Assumptions to verify
- The portfolio value is treated as a single starting balance in the same currency as the displayed dollar amount.
- The withdrawal rate is a percentage applied once to the entered portfolio value.
- The monthly equivalent is the annual amount divided evenly by 12 and rounded to two decimal places.
- No return, inflation, tax, fee, reserve, withdrawal timing, or longevity model is applied.
Frequently asked questions
What does the calculator calculate?
It multiplies the portfolio value by the withdrawal rate and divides by 100, then divides the annual amount by 12 for a monthly equivalent.
Does it estimate how long my savings will last?
No. It does not model returns, inflation, fees, taxes, withdrawal timing, or a time horizon.
Is the monthly amount a payment schedule?
No. It is the annual arithmetic amount divided by 12, not a cash-flow schedule.
Does a 4% result mean 4% is safe?
No. The calculator does not assess sustainability. A rate alone cannot establish whether a portfolio will support future spending.
Is this financial advice?
No. The result is arithmetic only and is not individualized financial, investment, or tax advice.
Cite this tool
BoringToolsKit. “Retirement Withdrawal Calculator.” boringtoolskit.com/retirement-withdrawal-calculator/. Free to reference in articles, syllabi, and answer posts with a link.
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