Health Insurance Calculator

Estimate a health plan's net annual cost by combining premiums, deductible, expected care, coinsurance, out-of-pocket maximum, and employer or HSA offsets.

Monthly premium

Deductible

Expected care charges

Coinsurance after deductible

Out-of-pocket max

Employer / HSA offset

Net monthly cost

$628

Net annual cost

$7,540

Expected out-of-pocket care

$3,700

Annual premiums

$5,040

How the math works

The calculator adds annual premiums to expected member cost sharing, caps care spending at the out-of-pocket maximum, then subtracts an employer contribution or HSA offset.

It is not an ACA subsidy calculator. Use plan documents and the marketplace estimate for final subsidies, covered services, and network rules.

Editorial noteMaintained by EveryCalc - Reviewed June 2026

EveryCalc calculators are designed for fast, practical estimates with transparent inputs and no required account. We use plain formulas, visible assumptions, and related tools so visitors can check the result from more than one angle.

Results are informational only. For financial, tax, legal, medical, construction, or other high-impact decisions, verify the output against primary sources or a qualified professional.

Learn more about our review process on the EveryCalc methodology page.

Calculation notes and example

Health plan cost formula used here

Net annual health plan cost equals annual premiums plus expected member cost sharing, capped at the out-of-pocket maximum, minus employer or HSA offsets. Cost sharing is estimated by applying deductible first, then coinsurance to the expected allowed charges above the deductible. This makes premium and utilization trade-offs easier to compare.

Worked example

A plan with a $420 monthly premium costs $5,040 before care. If expected allowed charges are $6,500, deductible is $3,000, coinsurance is 20%, and the out-of-pocket maximum is $8,500, member care cost is modeled separately from premium. An employer HSA contribution can reduce the net annual cost.

Edge cases and practical tips

Marketplace subsidies and premium tax credits require household-income inputs and official marketplace rules.
Network, formulary, and covered-service differences can matter more than the premium.
Run low-care and high-care scenarios before choosing a high-deductible plan.

Useful companion tools: Health Insurance Premium Tax Credit Calculator, HSA Contribution Savings Calculator, FSA Tax Savings Calculator, and Medical Expense Tax Deduction Calculator.

How to interpret the health insurance result

Best use

Use the result as a planning number for comparing payments, rates, returns, tax reserves, or cash-flow choices before you request a quote or make a commitment.

Cross-check

Compare the answer with the contract, lender estimate, tax form, brokerage statement, payroll record, or invoice that will control the real-world outcome.

Watch for

Do not rely on a single optimistic rate, return, or fee assumption. Money pages work best when you run low, base, and high cases and keep professional advice separate from the estimate.

This page belongs to the Finance calculator library, so the answer should be read in the context of the decision you are modeling rather than as a universal rule.

Before relying on this health insurance estimate

Most calculator mistakes come from the inputs, not the arithmetic. Use this short audit before you reuse the answer in a spreadsheet, quote, application, or important conversation.

Confirm source numbers

Match balances, rates, fees, taxes, income, and payment dates against the lender quote, payroll record, tax form, statement, invoice, or contract.

Separate cash flow from total cost

A lower monthly payment can still cost more over time if fees, interest, taxes, or a longer term are hidden in the structure.

Run conservative cases

Test at least one higher-cost or lower-return case before using the output for a purchase, refinance, investment, loan, or tax decision.

Rerun this page when the rate, price, term, fee, tax rule, income, expense, or expected holding period changes.

How to Use

Enter the plan's monthly premium.
Add deductible, coinsurance, and out-of-pocket maximum.
Estimate expected allowed medical charges for the year.
Subtract employer contributions or HSA funding to compare net cost.

Frequently Asked Questions

Is this an ACA subsidy calculator?

No. This calculator focuses on plan cost sharing. Marketplace subsidies, tax credits, networks, covered services, and household income rules should be checked with official marketplace tools.

Why include expected care charges?

A low-premium plan can cost more if expected care is high. Entering a care estimate helps compare premium savings against deductible and coinsurance exposure.

How should I compare HSA plans?

Include employer HSA contributions as an offset, then compare the net cost with a non-HSA plan. Also consider tax savings from your own HSA contributions.