What is coinsurance and how do I enter it?

Coinsurance is the percentage of costs you share after the deductible; enter it as a decimal (e.g., 0.2 for 20%).

Do I need to include taxes in the total cost?

Include any amounts the insurer will consider part of the claim, typically the full billed amount before taxes if they are reimbursed.

Can I use this for health, auto, and property claims?

Yes, the calculator works for any claim where deductible and coinsurance apply.

Why is my out‑of‑pocket higher than the deductible?

After the deductible, the coinsurance fraction of the remaining balance adds to your out‑of‑pocket cost.

Is the calculator accurate for multiple‑deductible policies?

It assumes a single deductible per claim; for layered deductibles, calculate each layer separately.

Insurance Coverage Calculator – See Payment & Out‑of‑Pocket Cost

How to use it

Enter the total cost of the claim.
Enter your deductible amount.
Enter the coinsurance as a decimal (e.g., 0.2 for 20%).
Click Calculate to see insurance payment and out‑of‑pocket cost.

What this calculator does

It takes three numbers you already know—total claim cost, deductible, and coinsurance (as a decimal)—and instantly shows two results: Insurance Payment and Out‑of‑Pocket Cost. Knowing these amounts helps you budget, compare policies, and avoid surprise bills.

Why the result matters

The insurance payment tells you how much the carrier will cover, while the out‑of‑pocket cost shows what you’ll actually pay after the deductible and your share of coinsurance. This split is crucial for cash‑flow planning and for deciding whether a higher‑premium plan might save you money in the long run.

How to read it

Insurance Payment = amount the insurer will pay.
Out‑of‑Pocket Cost = deductible plus your coinsurance share of the remaining balance. Use these numbers to negotiate, file claims, or simply understand your financial exposure.

Pro tips

Round your total cost to the nearest dollar before entering it to keep results tidy.
If your policy uses a percentage, convert it to a decimal (20% → 0.2) before typing.
Enter the deductible first; a zero deductible will show pure coinsurance impact.
Double‑check that the coinsurance fraction matches your policy wording to avoid mis‑calculations.

Real-life examples

A homeowner estimating costs after a roof leak wants to know how much the insurer will actually pay.
A small‑business owner reviewing a medical claim to budget cash flow for the month.
An individual comparing two health plans by plugging the same claim amount into each calculator.

Case study

Maria had a $12,000 car repair estimate with a $1,000 deductible and 0.15 coinsurance. Using the calculator, she saw the insurer would pay $9,350 and her out‑of‑pocket would be $2,650, letting her plan her budget confidently.