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Critical Illness Insurance Calculator

Reviewed by the CalculatorHub team, edited by James Graham. AHA/NIH cost data applied. Last verified 14 June 2026.

Critical illness insurance pays a lump sum on diagnosis of a serious illness, giving you financial flexibility that income replacement alone does not provide. This calculator sums the key financial exposures you would face: out-of-pocket medical costs above your health insurance coverage, income lost during treatment and recovery, mortgage or rent payments during the period you cannot work, home or vehicle modification costs, and any rehabilitation expenses. The total is your recommended critical illness benefit.

Deductibles, co-pays, non-covered treatments, travel to specialists
Ramps, bathroom modifications, vehicle hand controls, etc.
$106,000.00
$106,000.00
$36,000.00
$24,000.00

Critical illness benefit formula

Income Loss = Monthly Income x Income Loss Months
Housing Cost = Monthly Housing x Housing Months
Gross Need = Medical OOP + Income Loss + Housing Cost + Home Mods + Rehab
Net Gap = max(0, Gross Need - Existing Coverage)

This approach follows guidance from financial planning texts that recommend critical illness cover address the immediate non-recurring costs that disability insurance (which pays monthly) cannot easily address.

Critical illness incidence rates (AHA / NCI data)

  • The American Heart Association reports that someone in the US has a heart attack every 40 seconds.
  • The NCI (National Cancer Institute) estimates that approximately 40 percent of all people will be diagnosed with cancer at some point in their lives.
  • The CDC reports that stroke kills approximately 160,000 Americans per year and is the leading cause of long-term disability.
  • Survival rates for many critical illnesses have improved dramatically, meaning more people live through a diagnosis and need financial support during recovery.

Frequently asked questions

What is critical illness insurance?

Critical illness insurance pays a tax-free lump sum on diagnosis of a specified serious illness, typically including heart attack, stroke, cancer, major organ failure, and coronary artery bypass surgery. Unlike income protection, the lump sum is paid regardless of whether you return to work. You can use it for any purpose: medical bills, mortgage, or living expenses.

What illnesses are typically covered?

The covered conditions vary by insurer but commonly include heart attack, stroke, cancer (life-threatening), multiple sclerosis, renal failure, blindness, deafness, loss of limbs, and Alzheimer's disease. The American Heart Association reports that cardiovascular disease, stroke, and cancer account for the majority of critical illness claims.

How much critical illness insurance do I need?

Financial planning guidance suggests considering: out-of-pocket medical costs not covered by health insurance (average cancer treatment co-pays can be $5,000 to $15,000 per year), lost income during treatment and recovery (3 to 24 months), home modifications if needed, mortgage or rent for 12 to 24 months, and any rehabilitation costs.

Is the lump sum from critical illness insurance taxable?

For individually purchased policies where you pay premiums with after-tax dollars, the lump sum benefit is generally received income-tax-free. If your employer pays the premiums as a benefit (pre-tax), the benefit may be taxable. Consult a tax professional for your specific situation.

Does critical illness insurance overlap with disability insurance?

They complement each other. Disability income insurance replaces your monthly income while you cannot work. Critical illness insurance provides an immediate lump sum on diagnosis, which can be used for costs that occur right away (deductibles, travel to specialists, home modifications) before disability benefits begin or for costs disability insurance does not address.

Official sources

Reviewed by the CalculatorHub team, edited by James Graham, 14 June 2026. See our methodology.