Health Insurance Deductible Calculator
What a Medical Bill Actually Costs You After the Deductible
A health plan's deductible, coinsurance percentage, and out-of-pocket maximum interact in ways that aren't obvious from the plan summary alone. This calculator walks a specific medical bill through all three so you can see, in dollars, what you'd owe — and where the out-of-pocket maximum caps further exposure regardless of how large the bill gets.
The Formula
Final Out-of-Pocket = min(that amount, Out-of-Pocket Maximum)
You pay the full bill up to the deductible, then the coinsurance percentage of whatever remains, until your total spending for the year hits the out-of-pocket maximum — after which the plan covers 100% of further costs.
A Worked Example
| Medical Cost | You Pay | Insurance Pays |
|---|---|---|
| $1,000 | $1,000.00 | $0.00 |
| $3,000 | $1,800.00 | $1,200.00 |
| $8,000 | $2,800.00 | $5,200.00 |
| $15,000 | $4,200.00 | $10,800.00 |
| $30,000 | $6,000.00 (capped) | $24,000.00 |
At $30,000, uncapped out-of-pocket would be $7,300 (deductible $1,500 + 20% of $28,500), but the $6,000 out-of-pocket maximum caps it there.
Where This Matters
- Choosing between health plans — running the same expected medical cost through two plans' deductible/coinsurance/max structures shows which one actually costs less for your situation, not just which has the lower premium.
- Budgeting for a planned procedure — if you know a surgery or treatment is coming, this gives a concrete worst-case dollar figure to set aside.
- Understanding an Explanation of Benefits — reverse-checking a bill you've already received against the formula confirms the insurer applied your plan terms correctly.
How to Use This Calculator
- Enter your plan's annual deductible.
- Enter the total medical cost for the scenario you're evaluating.
- Enter your coinsurance percentage (the share you pay after the deductible, e.g. 20 for 20%).
- Enter your plan's out-of-pocket maximum.
- Select Calculate to see your capped out-of-pocket cost and what insurance pays.
Related Calculations
Compare overall protection levels with the Coverage Calculator, or weigh two specific health plans against each other using the Insurance Premium Comparison Calculator.