Rates verified 5 May 2026 against regulated industry sources. (See full methodology.)
Recovery period · Lost income · Care costs · Treatment & adaptations · Pence-precision maths
This calculator estimates critical illness cover needs based on transparent rules of thumb. It's a starting point — not personalised financial advice. For advice tailored to your circumstances, consult an FCA-regulated financial adviser.
Estimate based on your inputs. Not a quote, not a recommendation, not regulated advice.
Step 1 — Your situation
Step 2 — Recovery and lost income
How long would you need full salary while focused on recovery? Common assumption: 12 months for serious illness recovery.
After full recovery, you may return to work part-time or in a less demanding role.
Many people return to 50–70% earning capacity after a serious illness.
Step 3 — Direct costs
Most NHS treatment is free. Some choose private cancer drugs, mental health support, or specialist physio.
Stair lifts, accessible bathrooms, ramps. Estimate £5,000–£20,000 for typical adaptations.
Step 4 — Family commitments
Additional childcare needed when you can't manage school runs, after-school care, etc.
Step 5 — Existing cover
Less common than death-in-service. Check your benefits statement.
Recommended additional cover
£103,000
On top of your existing £10,000 of cover and savings
Total protection need
£113,000
You already have
£10,000
Gap to fill
£103,000
Illustrative monthly premium: A healthy 40-year-old non-smoker might pay roughly £26–£62/month for £103,000 of 25-year level critical illness cover. Critical illness cover typically costs 4–6× more per £100k than equivalent life insurance because the conditions covered are more likely than premature death. Premiums vary widely by health, smoking history, term length, and provider.
This is a starting point for conversations with a broker. Actual cover needs depend on health history, family medical history, employer benefits, and personal circumstances. Take this number to an FCA-regulated adviser for a tailored recommendation.
What is critical illness cover and how does it differ from life insurance?
Critical illness cover pays a tax-free lump sum if you're diagnosed with one of a defined list of serious conditions — typically cancer, heart attack, stroke, multiple sclerosis, kidney failure, and major organ transplant, with most UK providers extending the list to 50+ conditions. Unlike life insurance, you don't have to die. The money is paid in your lifetime to fund private treatment, home adaptations, family travel, and to replace lost income while you recover. The statistics matter: a 40-year-old has roughly a 25% chance of suffering a critical illness before retirement vs around a 10% chance of dying during their working life. Critical illness is genuinely useful protection — and genuinely expensive, typically 4–6× the cost of equivalent life cover.
How much critical illness cover do I actually need?
Most UK households are underinsured for critical illness. The common 1× annual salary rule of thumb ignores the actual cost of an illness — typically 12–24 months of lost full income, a possible permanent reduction in earning capacity, treatment costs not covered by the NHS, and family commitments such as childcare cover during recovery. A needs-based approach works backwards from what you would actually spend. Most calculators land between £100k and £300k of recommended cover for a working parent — much higher than the 1×–2× salary that employer-provided benefits typically offer. Combine with our Life Insurance Needs Calculator for a full protection plan, and use your Take-home Pay Calculator output to set a realistic income figure.
Critical illness vs income protection — which one?
Two products that overlap. Critical illness pays a lump sum on diagnosis of specified conditions. Income protection pays a monthly income for as long as you cannot work, regardless of cause. Most UK advisers recommend income protection first because it covers more scenarios (back injury, depression, ME/CFS, any reason you can't work) and pays for longer — often to retirement age. Critical illness is best used as a top-up for major lump-sum needs such as clearing the mortgage or funding private treatment. If you only have budget for one, most advisers suggest income protection. For ongoing income replacement, see our Income Protection Calculator for a parallel needs analysis.
Frequently asked questions
How much critical illness cover do I need in 2026?
▾
Most UK working parents land in the £100,000–£300,000 range on a needs-based calculation: enough to cover 12–24 months of lost income, possible permanent reduction in earning capacity, treatment costs not covered by the NHS, and family commitments such as childcare while you recover. The 1× annual salary rule of thumb is almost always too low because it ignores the duration of recovery and the long tail of reduced earning capacity. Use the calculator above with your real income, dependants, and savings to size cover properly.
What conditions does critical illness cover include?
▾
Standard ABI definitions cover seven core conditions: cancer (of specified severity), heart attack, stroke, coronary artery bypass surgery, kidney failure, major organ transplant, and multiple sclerosis. Most UK providers extend the list to 50–80+ conditions including Parkinson's, motor neurone disease, Alzheimer's, blindness, deafness, severe burns, and aortic surgery. Children's cover is often included free. Always check the policy wording — definitions and severity thresholds vary materially between providers, and a less generous policy can be 30–40% cheaper for a reason.
Is critical illness cover worth it if I have life insurance?
▾
Yes — they cover different risks. Life insurance pays only on death. Critical illness pays a lump sum on diagnosis of a specified serious condition while you're alive, when you typically need money most: to fund treatment, adapt your home, replace lost income, and reduce financial stress during recovery. A 40-year-old has roughly a 25% chance of suffering a critical illness before retirement vs around 10% chance of dying during their working life. Many UK families buy a combined policy (life + CI) because it's slightly cheaper than two standalone policies.
How much does critical illness cover cost per month?
▾
For a healthy 40-year-old non-smoker, £100,000 of 25-year level critical illness cover typically costs around £25–£60 per month in 2026. By age 50 the same cover often costs £55–£120. By age 55 it can exceed £90–£200. Critical illness is roughly 4–6× more expensive than equivalent life cover because the conditions covered are far more likely than premature death. Smokers and applicants with health conditions can pay 2–10× more. Premiums rise sharply with age — buying earlier is materially cheaper.
Can I claim on critical illness cover for cancer?
▾
Yes — cancer is the single largest source of CI claims in the UK, typically 60–70% of paid claims — but not every diagnosis qualifies. Most policies pay the full sum for invasive cancers of a defined severity and a partial sum (often 25%) for less advanced cancers such as in-situ ductal carcinoma or low-grade prostate cancer. Always read the cancer definition in the policy wording; the difference between a 'core' policy and a 'comprehensive' one is mostly about cancer breadth.
Should I get standalone critical illness or combined with life insurance?
▾
For most UK families with dependants, two standalone policies provide better protection than a combined policy, because a CI claim does not extinguish your life cover — and after a serious illness, buying new cover may be impossible. Combined policies pay out on the first event only (CI diagnosis or death) and then end; they're typically 5–15% cheaper but permanently remove life cover after a CI claim. Standalone CI plus standalone life pays out separately on each event, leaving both protections in place.
Calcsmith provides estimates based on the information you enter. This is a needs estimate, not a quote, recommendation, or regulated financial advice. Consult an FCA-regulated financial adviser for personalised guidance.