How Much Life Insurance, and For How Long:
the 4 ways to size it

The question that gets skipped

Most writing about life insurance argues about which kind to buy. Term or permanent. That argument is worth having once, and once it is settled almost nobody tells you the thing you actually need next: how much, and for how long.

It is not a small omission. When asked why they have not bought cover, 33% of Gen Z and 28% of Millennials say they do not know how much or what type they need.¹ The advice stopped one step short of the decision.

Start with the price, because you are probably wrong about it

Before any sizing method, one correction that changes the whole conversation.

People overestimate what life insurance costs by an enormous margin. Asked to guess the annual premium for a healthy young adult, buyers under 31 estimate around $1,200. The actual figure is about $192. At ages 31 to 35 the guess is around $900 against about $204. At 36 to 40, $500 against about $252.¹

That is roughly six times too high at the younger end. And the gap is not harmless — the most common reason people give for not buying is cost.

There is a related fact worth holding onto. About 52% of US adults own life insurance, while 38% either need it or need more than they have — 29% who have none and need some, plus 9% who have some and need more.¹ Roughly 98 million people.

Four ways to size it

They give different answers, and knowing which one someone is using tells you something about their incentives.

Income multiple. Ten times income, or some similar rule. Quick, crude, and completely blind to your actual obligations — it treats a renter with no children the same as someone with a mortgage and three dependants.

DIME. Add up Debt, Income replacement for the years needed, Mortgage, and Education costs. Better, because it is built from real numbers rather than a rule of thumb, and easy to do on paper in ten minutes.

Human life value. Your total expected future earnings, discounted. This reliably produces the largest number of the four — which is worth knowing when someone runs it for you, because a method that always suggests more cover is popular for reasons unrelated to its accuracy.

Capital needs analysis. What does the household actually need, year by year, after counting what already exists — savings, existing cover, survivor benefits — and what obligations genuinely end at death? Most work, best answer.

If you do only one, do DIME. If someone runs human life value for you and it produces a number twice as large, ask which assumptions did that.

The four things sizing usually gets wrong

More money is lost in these than in choosing the wrong method.

Term length is chosen far worse than term amount. People agonize over $500,000 versus $750,000 and then pick 20 years without thinking. A 20-year policy bought when a child is two expires when that child is 22 — which is precisely when the tuition bills land. The term should reach past the last year anyone depends on you, not to a round number.

The non-earning parent is almost never insured. The logic is that they have no income to replace. But if they died, someone has to be paid to do what they were doing — full-time childcare is a real, large, immediate cost, for years. Their replacement cost is not zero and is often the largest uninsured exposure in a young household.

Survivor benefits get ignored in both directions. Some households buy cover for money their survivors would receive anyway. Others assume benefits that do not exist or are far smaller than imagined. Both errors come from never looking it up.

Your own consumption is not netted out. If you died, the household loses your income and also stops paying for you — your food, your car, your share of everything. Replacing 100% of your income overinsures by whatever you consumed. This is a real reduction and almost nobody applies it.

Sizing disability cover

The same question, for a risk that is more likely and gets a fraction of the attention.

Target roughly 60–70% of gross income. Higher is generally not available, deliberately — insurers do not want a benefit that competes with going back to work.

Check how the benefit is taxed, because it doubles the size of the decision. If your employer pays the premium, the benefit is generally taxable when it arrives. If you pay it with your own after-tax money, it generally is not. The same headline percentage can be worth a third more or less depending on which applies, and paying the premium yourself is sometimes the better deal precisely because of this.

Match the elimination period to the reserve you actually have, not the one you plan to build. A 90-day wait needs three months of expenses sitting in an account today.

Insist on own-occupation cover if your income depends on a specific skill. A policy that pays only when you cannot do any work is a much weaker product than it appears, and the difference is invisible until you claim.

The thing that actually goes wrong

One reframe worth carrying, because it redirects the anxiety to where it belongs.

Life insurance pays its claims. The failure mode is almost never that a company refuses after a death. It is that the policy was not there when the death happened — lapsed, canceled, or never bought.

The enemy is lapse, not denial. Which means the right amount of cover is the amount you will still be paying for in fifteen years, and a policy sized so ambitiously that it gets dropped in a bad year has failed more completely than one that was slightly too small.

Where Plenee fits

Every sizing method needs the same inputs: what you owe, what you earn, what is committed every month, and what already exists. Plenee holds all four. That turns a form-filling exercise into a calculation, and — more usefully — it can flag the moment the answer changes, which is what actually goes stale. Cover sized at the birth of a first child is the wrong number by the time there are three.

The short version

Cover costs about a sixth of what people guess. Use DIME if you use one method, and treat any method that always recommends more with appropriate suspicion. Choose the term length as deliberately as the amount, because expiring the year tuition starts is a common and expensive mistake. Insure the parent who does not earn — their replacement cost is real. Net out what you personally consume. Size disability at 60–70% of gross and check who pays the premium, because that decides whether the benefit is taxed. And size all of it to survive a bad year, because a lapsed policy is the only real failure mode.