How the lifetime total is built
You enter the monthly Part B, Medigap, and Part D premiums, an annual out-of-pocket figure for deductibles and copays, a retirement horizon in years, and a growth rate for medical costs. The tool annualizes the premiums, adds the out-of-pocket figure, applies the growth rate to each year of the horizon, and sums the years into one lifetime total. The calculation runs entirely in the browser; nothing is uploaded.