Critical Illness Calculator

Critical illness cover pays a single tax-free lump sum if you are diagnosed with one of a defined list of serious conditions during the policy term — cancer, a heart attack, a stroke, and dozens of others depending on the policy. Unlike life insurance, it pays out while you are still alive, specifically to help with the financial pressure a serious diagnosis brings: medical costs, mortgage payments, or simply time off work during treatment and recovery. This calculator estimates what that cover is likely to cost based on your age, the amount you want covered, and the term.

Why This Costs So Much More Than Life Insurance

Critical illness cover is consistently more expensive than life insurance for the same sum insured and the same person, and the reason is straightforward: the probability of being diagnosed with a covered condition during a working lifetime is considerably higher than the probability of dying during the same period. Roughly one in two people in the UK will develop cancer at some point in their lives, and cancer alone accounts for a large share of critical illness claims — insurers price the cover to reflect that real, comparatively high claim probability, not an arbitrary premium. Our Life Insurance Calculator is worth comparing directly if you are weighing up the two as part of the same overall protection decision.

This price gap often surprises people shopping for cover for the first time, since the two products can look superficially similar — both pay a tax-free lump sum, both are arranged for a fixed term — but the underlying claim likelihood behind each is genuinely very different, and the pricing reflects that difference honestly rather than arbitrarily.

The Age Curve That Steepens Fast

Critical illness premiums rise with age more steeply than many people expect, and the increase is not gradual and linear — it accelerates. A policy taken out in your twenties can cost a small fraction of the same cover taken out in your fifties, since illness risk genuinely increases with age far more sharply than mortality risk does over the same range. This is one of the strongest arguments for arranging cover earlier rather than later if you know you want it eventually: locking in a rate while younger, on a long-term policy, can lock in a considerably lower premium for the whole term than waiting and applying later at an older age would achieve.

Once a level-term policy is in place, the premium is generally fixed for the whole term regardless of how your health changes afterward — this is precisely the appeal of arranging cover while young and healthy, since a future health issue that might make new cover difficult or expensive to obtain does not affect a policy already locked in.

Seeing the Age Gap in Practice

For £100,000 of cover over a comparable term, a non-smoker in their mid-twenties might pay a monthly premium in the low single-figure pounds, while the same cover taken out in your late fifties can run into the hundreds of pounds a month — not a modest increase, but often a difference of well over tenfold across that age range for identical cover. This is a considerably steeper age curve than most other insurance types show, which is exactly why arranging critical illness cover is often recommended earlier than people instinctively think to consider it.

What Actually Gets Covered (And What Doesn’t)

Policies typically cover somewhere between 30 and 60 defined conditions, based on standardised definitions set by the Association of British Insurers (ABI) to reduce disputes over what genuinely qualifies. Cancer, heart attack and stroke make up the large majority of actual claims, but the full list usually extends to conditions like multiple sclerosis, major organ transplant, and permanently disabling injuries. It is worth checking a policy’s exact definitions rather than assuming — for example, some cancers at a very early stage may be excluded or only partially covered under some policies, since definitions can genuinely vary between insurers even for the same named condition.

Why Smokers See Such a Sharp Jump Here Specifically

The loading applied to smokers on critical illness cover is typically more severe than the equivalent loading on life insurance, reflecting the particularly strong link between smoking and several of the most commonly claimed conditions, cancer chief among them. This calculator applies a meaningfully larger smoker adjustment than a comparable life cover estimate would, specifically because the underlying claims data supports a bigger gap for this type of cover. Quitting smoking for a sustained period, typically 12 months, before applying can make a genuine difference to the premium offered. If income replacement during a serious illness, rather than a lump sum, is more relevant to your situation, our Income Protection Calculator covers that separately.

Frequently Asked Questions

Important Information

This calculator provides an estimate for general information purposes only and does not constitute insurance or medical advice. Actual premiums depend on a full health declaration and individual underwriting by the insurer, and conditions covered vary by policy. For advice specific to your circumstances, consult a qualified financial adviser. See our Disclaimer for further information.