You are 52 years old. You have saved $450,000. You plan to retire at 67. You want to spend $60,000 per year in retirement. But here is the question that keeps you awake at night: Will your money last? If you live to 85, your $450,000 needs to stretch across 18 years of retirement while inflation erodes its purchasing power. What if you live to 95? What if market returns are lower than expected? What if you want to spend $75,000 some years? The math is complex. You could hire a financial advisor for $5,000 to run projections. Or you could guess and hope. Or you could use a retirement calculator to instantly see that your $450,000, plus Social Security of $2,200/month starting at 67, will support spending of $62,000 per year through age 95 (assuming 5% investment returns and 2.5% inflation). A retirement calculator projects whether your savings, investments, and Social Security will sustain your desired lifestyle throughout retirement. It shows the probability of money lasting until the ...