Updated July 9, 2026
How the premium estimate is calculated
The tool multiplies a base rate for the plan letter you pick by an age factor and a regional cost factor, then rounds to the nearest dollar. Nothing about the math is secret: the three inputs above are the only three numbers that move the output.
The base rates built into this page are $145 for Plan G, $110 for Plan N, $160 for Plan F (limited to people who became Medicare-eligible before 2020), and $60 for high-deductible Plan G. Age nudges that base up or down: the multiplier is 0.85 at 65, 1.0 at 70, 1.25 at 75, and 1.6 at 80 and older. Region does the same job for geography, from 0.85 in lower-cost counties to 1.3 in expensive metro markets such as South Florida, the New York City area, and parts of coastal California.
Worked example: three shoppers, three outcomes
A 65-year-old buying Plan G in a lower-cost county: $145 base × 0.85 age × 0.85 region = about $105 a month, or roughly $1,257 a year. A 70-year-old buying Plan N in an average-cost area: $110 × 1.0 × 1.0 = $110 a month, about $1,320 a year, with small copays layered on top. An 80-year-old shopping for Plan G in a high-cost state: $145 × 1.6 × 1.3 = roughly $302 a month, close to $3,619 a year. Same plan letter, same coverage, nearly triple the premium once age and geography compound.
Things to know about this estimate
- The figures are planning numbers, not quotes; real premiums from real insurers can land above or below what the tool shows.
- Insurers price Plan G and Plan N differently depending on whether they use community, issue-age, or attained-age rating, which this simple model does not distinguish between.
- Tobacco use, household discounts, and gender can shift a real quote in ways this calculator does not attempt to model.
- The regional multiplier is a rough stand-in for state-level pricing; the state-by-state reference gives a more specific starting point.