A Medicare cost calculator pulls together the several separate bills that make up your total Medicare spending β the Part B premium, a Part D prescription drug plan, an optional Medigap or Medicare Advantage supplement, and whatever you pay out of pocket for care that isn't fully covered β into one combined annual number. Because Medicare isn't a single flat-fee product, it's easy to underestimate your real yearly cost by only thinking about the Part B premium that gets deducted from Social Security.
Arb Digital built this calculator, along with several other insurance and retirement planning tools, to make it easier for people to see the full picture in one place. We're a digital marketing agency rather than a Medicare broker or insurer, so treat this as an educational estimate, not a quote β always confirm current figures directly on medicare.gov.
What This Medicare Cost Calculator Does
You select an income bracket, which drives your estimated Part B monthly premium (higher earners pay an income-related monthly adjustment amount, commonly called IRMAA, on top of the standard premium). You then enter your Part D prescription drug premium, your Medigap or supplement premium if you have one, and an estimate of your annual out-of-pocket spending for copays, coinsurance, and anything not fully covered. The calculator converts each monthly premium to an annual figure, adds your out-of-pocket estimate, and totals everything into one estimated annual Medicare cost.
This tool intentionally keeps the inputs simple. Real Medicare costs also depend on whether you choose Original Medicare with a supplement versus a Medicare Advantage plan, which drugs you take and their tier under your specific Part D formulary, and whether you qualify for any income-based assistance programs. Use this as a starting estimate before comparing actual plans during open enrollment.
How to Use It
- Select your income bracket. This determines your estimated Part B monthly premium, including any IRMAA surcharge for higher incomes.
- Enter your Part D premium. This varies widely by plan and by which drugs you take β check your specific plan's premium if you already have one.
- Enter your Medigap or supplement premium. If you're on a Medicare Advantage plan instead, you might set this closer to $0 and rely more on the out-of-pocket field, since Advantage plans typically bundle costs differently.
- Estimate your annual out-of-pocket spending. Think about routine care, dental, vision, hearing, and any coinsurance you expect for the year.
- Click Calculate to see your annual Part B, Part D, Medigap, and out-of-pocket totals, plus one combined estimated annual cost.
The Formula Behind the Numbers
The calculation is a straightforward sum of annualized components. Part B annual cost equals the monthly premium tied to your selected income bracket multiplied by 12. Part D annual cost equals your entered Part D monthly premium multiplied by 12. Medigap annual cost equals your entered Medigap monthly premium multiplied by 12. Your estimated annual out-of-pocket spending is added on top exactly as entered. The estimated annual Medicare cost is simply the sum of all four figures. Official, current Medicare premium and cost information is published by the Centers for Medicare & Medicaid Services at Medicare.gov, which is the authoritative source to confirm exact numbers for your situation.
Understanding IRMAA and Why Income Matters
The income-related monthly adjustment amount, or IRMAA, is an extra charge added to the standard Part B (and Part D) premium for people whose income exceeds certain thresholds. What surprises many new Medicare enrollees is that IRMAA is based on income from two years prior, using your tax return, not your current income. That means a one-time high-income year β from a home sale, retirement account withdrawal, or business sale β can temporarily push your premium into a higher bracket even after your income has dropped back down. If that happens to you, the Social Security Administration has an appeals process for certain "life-changing events" that can reduce or reset your IRMAA determination.
Original Medicare vs. Medicare Advantage: Why Costs Differ
This calculator is built around the Original Medicare plus Medigap plus Part D structure, which is the most common way to think about total Medicare cost in modular pieces. If you choose Medicare Advantage instead, your monthly premium structure often looks very different β sometimes $0 for the plan itself β but your out-of-pocket costs, network restrictions, and annual maximum out-of-pocket limits work differently too. Neither approach is universally cheaper; it depends heavily on how much care you use, which doctors and hospitals you want access to, and which drugs you take. Running this calculator with your actual anticipated numbers under both approaches is a useful way to compare them side by side.
What Can Change Your Actual Cost
- Annual premium adjustments. Part B and Part D premiums, deductibles, and IRMAA thresholds are typically reviewed and adjusted every year.
- Plan changes during open enrollment. Switching Part D or Medigap plans can meaningfully change your monthly premium and drug costs.
- Health status and drug needs. More prescriptions or more frequent care naturally raises out-of-pocket spending regardless of your premiums.
- State of residence. Medigap and Medicare Advantage pricing can vary significantly by state and even by county.
- Extra Help and Medicaid dual-eligibility. Lower-income enrollees may qualify for programs that substantially reduce or eliminate several of these costs.
Worked Example: A Standard-Bracket Retiree's Annual Bill
Say a retiree falls in the standard Part B bracket, at roughly $175 a month, carries a Part D plan around $40 a month, adds a Medigap Plan G supplement around $150 a month, and expects about $1,500 a year in miscellaneous out-of-pocket spending for dental cleanings, a pair of glasses, and the occasional urgent care copay. Annualized, that's $2,100 for Part B, $480 for Part D, and $1,800 for Medigap, plus the $1,500 out-of-pocket estimate β a total right around $5,880 for the year, or roughly $490 a month all-in. That's a very different number than the roughly $175 a month most people picture when they think "my Medicare premium," and it's exactly the gap this calculator is built to expose before it becomes a surprise on a fixed retirement budget.
Now compare that to a higher earner in the $193,001β$500,000 IRMAA bracket with the same Part D and Medigap costs. Their Part B alone jumps to roughly $6,708 a year, pushing their all-in annual total closer to $10,500 β nearly double the standard-bracket retiree's cost for otherwise identical coverage. That swing illustrates why understanding your IRMAA bracket, and whether it's likely to change, matters just as much as shopping for the cheapest Part D plan.
Timing Medicare Decisions Around Income Events
Because IRMAA looks back two years at your tax return, decisions you make well before you even enroll in Medicare can echo into your premium years later. Retiring mid-year, taking a large IRA distribution, exercising stock options, or selling a home in the years leading up to Medicare eligibility can all push a future year's premium into a higher bracket, even if your income has since settled back down. Some people time large one-time income events deliberately around this two-year look-back, spreading Roth conversions across multiple years, for example, specifically to avoid tripping an IRMAA threshold. This calculator doesn't project future brackets, but knowing the two-year delay exists is often the single most useful piece of Medicare cost planning most people never hear about until it's already cost them money.
Medicare is just one line item in a bigger retirement healthcare picture. Try our long-term care insurance calculator to see how much a future care need could add, or get in touch if you'd like a site or content strategy built for the audience searching for this kind of planning help.
Long-Term Care Calculator All Free ToolsCommon Mistakes to Avoid
- Only counting the Part B premium. Part D, Medigap or Advantage costs, and out-of-pocket spending usually add up to more than Part B alone.
- Forgetting IRMAA applies to Part D too. Higher earners can face an income adjustment on their drug plan premium in addition to Part B.
- Assuming this year's income bracket is permanent. IRMAA is reassessed annually based on a two-year-old tax return, so it can move in either direction.
- Ignoring plan changes during open enrollment. Premiums and formularies change yearly β reviewing your Part D plan every fall can meaningfully lower costs.
- Not comparing Original Medicare with supplement against Medicare Advantage. The two paths can have very different cost profiles for the same person.
Related Free Tools From Arb Digital
If you're mapping out healthcare costs in retirement, also try the Long Term Care Insurance Calculator to project future care costs, the Health Insurance Calculator if you're comparing plans before you're Medicare-eligible, the HSA Calculator to see how a health savings account fits in, the Dental Insurance Calculator since routine dental usually isn't covered by Medicare, and the Out-of-Pocket Max Calculator for understanding annual coverage limits. Browse the full free online tools hub for more.
Frequently Asked Questions
IRMAA is the income-related monthly adjustment amount added to the standard Part B and Part D premiums for enrollees whose income, based on a tax return from two years prior, exceeds certain thresholds.
Original Medicare generally does not cover routine dental, vision, or hearing care. Some Medicare Advantage plans include limited coverage for these, which is worth factoring into your out-of-pocket estimate.
IRMAA is based on tax return data from two years earlier, so a change this year can reflect income reported previously rather than your current situation.
It depends on your health needs, preferred providers, and how much care you use in a given year. Neither option is universally cheaper β compare both using your own expected usage.
Yes, the Social Security Administration allows appeals for certain life-changing events, such as retirement, divorce, or the loss of income-producing property, that lowered your income after the tax year used for the determination.
At least once a year during Medicare's open enrollment period, since premiums, IRMAA brackets, and plan options are typically updated annually.
This tool provides general estimates for educational purposes only and is not financial, tax, legal, or medical advice. Figures are illustrative; consult a licensed professional for decisions.
