Finance Formula • Published on July 30, 2026 • Last updated July 30, 2026
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Total financial nest egg required at start of retirement
Estimated living expenses in the first year of retirement
Real rate of return (Expected Return - Inflation Rate)
Number of retirement years to plan for (life expectancy - retirement age)
The retirement planning formula estimates the corpus required to sustain your current lifestyle during retirement. It accounts for inflation, which increases living costs, and calculates the necessary nest egg based on a real rate of return.
The 4% rule suggests that if you withdraw 4% of your retirement corpus in the first year and adjust subsequent withdrawals for inflation, your savings should last at least 30 years.
Inflation erodes the purchasing power of money. A corpus that seems large today may buy much less in 20 or 30 years, which is why inflation must always be factored in.
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