Health Insurance Deductible Calculator
Know the true cost of your health plan.
Calculate health insurance true cost including deductible and coinsurance — expected and worst-case annual cost at your plan structure.
What this tool does
This calculator models your total annual health insurance cost by combining your premium with the out-of-pocket expenses you're likely to pay. It takes your annual premium, deductible amount, expected medical claims, coinsurance percentage, and out-of-pocket maximum, then estimates what you'll actually spend across the year. The result shows the combined figure—your premium plus the portion of claims you cover yourself. The calculation accounts for how your deductible reduces the claims you pay, how coinsurance splits costs above the deductible, and how your out-of-pocket maximum limits your total cost-sharing. This is most useful for comparing different plan structures or understanding the relationship between a low premium and high deductible versus higher premium and lower cost-sharing. The estimate assumes your claims match your projection and doesn't model variations in actual medical utilization or plan exclusions.
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Formula Used
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Disclaimer
Results are estimates for educational purposes only. They do not constitute financial advice. Consult a qualified professional before making financial decisions.
Health insurance deductibles create a gap between premium paid and actual cost if medical care is needed. A low-premium high-deductible plan might cost 2,400/year in premium but leave 5,000 out-of-pocket if something happens. This calculator shows the expected and worst-case annual cost.
2,400 premium with 5,000 deductible, 3,000 expected claims, 20% coinsurance: under-deductible cost 3,000, coinsurance on the 0 above deductible = 0, total OOP 3,000. Total annual cost 5,400. Worst case hitting out-of-pocket max is usually 5,000-8,000 plus premium.
The tool helps compare plans. A 150/month HMO with 500 deductible might beat a 100/month HDHP with 6,000 deductible for families expecting regular medical care. Without expected claims, high-deductible often wins on premium savings alone.
Run it with sensible defaults
Using annual premium of 2,400, deductible of 5,000, expected medical claims of 3,000, coinsurance of 20%, the calculation works out to 5,400.00. The defaults are meant as a starting point, not a recommendation.
The levers in this calculation
The inputs — Annual Premium, Deductible, Expected Medical Claims, Coinsurance %, and Out-of-Pocket Max — do not pull with equal force. Not every input has equal weight. Adjusting one input at a time toward extreme values shows which ones move the result most.
How the math works
Under-deductible = min(claims, deductible). Coinsurance = claims above deductible × rate. OOP = min(under-deductible + coinsurance, max). Total = premium + OOP.
Using this as a check-in
Re-run this every three months. A single reading tells you where you stand; four readings tell you whether things are improving. The trend matters more than any individual snapshot.
What this doesn't capture
The result reflects only the inputs you provide and the assumptions built into the formula. It is a simplified model rather than a complete picture, and factors specific to your situation may matter just as much.
£2,400 premium + £5,000 deductible with £3,000 claims = $5,400.00.
Inputs
This example uses typical values for illustration. Adjust the inputs above to match a specific situation and see how the result changes.
Sources & Methodology
Methodology
Under-deductible = min(claims, deductible). Coinsurance = claims above deductible × rate. OOP = min(under-deductible + coinsurance, max). Total = premium + OOP.
Frequently Asked Questions
HDHP vs low-deductible?
Does universal healthcare coverage apply?
What happens when my expected claims exceed the out-of-pocket maximum?
How do I estimate my expected medical claims if I don't know what I'll spend this year?
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