Inflation Adjustment: Your desired retirement income is adjusted for inflation over the years until retirement.

Required Savings: Calculated using the 4% rule - you need 25x your annual retirement income to safely withdraw 4% annually.

Monthly Contribution: Determines how much you need to save monthly to reach your retirement goal, accounting for compound interest.

Investment Returns: Assumes consistent annual returns on your investments. Higher returns mean lower monthly contributions needed.

Note: This is a simplified calculation. Consider consulting a financial advisor for personalized planning.