The formula
Life insurance needs are one formula with four parts and one subtraction. The income replacement is the annual income times the years to replace. The total need is the income replacement plus the mortgage balance plus the other debts plus the education fund plus the final expenses. What you already hold is the existing life insurance plus the liquid savings. The recommended coverage is the total need minus what you already hold, and it is never below $0. The life insurance needs calculator runs the same seven steps for you.
Step 1 — Add up the income to replace
Start with the income your family would lose. Our worked example uses an $85,000.00 annual income: a family living on $85,000.00 a year loses $85,000.00 a year if the earner dies. Multiply it by the years to replace: $85,000.00 times 10 years is $850,000.00. Ten years is the common default — long enough for a young family to adjust, short enough to keep the cover affordable. Write the number down first: $850,000.00.
Step 2 — Add the mortgage
Add what is left on the mortgage. Our worked example uses a $250,000.00 mortgage balance: the family needs the mortgage paid off, or they keep paying it from a smaller income. Add it to the replacement: $850,000.00 plus $250,000.00 is $1,100,000.00 so far. Use the balance today, not the original loan amount.
Step 3 — Add the other debts
Add the other debts besides the mortgage. Our worked example uses $15,000.00: car loans, credit cards, any loan someone else would inherit. Add it in: $1,100,000.00 plus $15,000.00 is $1,115,000.00 so far. Leave out debts that die with you — only count what someone else would have to pay.
Step 4 — Add the education fund
Add the education fund for the kids. Our worked example uses a $100,000.00 fund: the cost of putting the kids through college or trade school. Add it in: $1,115,000.00 plus $100,000.00 is $1,215,000.00 so far. The college savings calculator works out the monthly saving for any education target.
Step 5 — Add final expenses
Add the final expenses. Our worked example uses $15,000.00: funeral costs and the bills that arrive in the first weeks. Add it in: $1,215,000.00 plus $15,000.00 is $1,230,000.00 — the total need. This is the number the family needs in full, before anything is subtracted.
Step 6 — Subtract what you already have
Subtract the life insurance you already hold and the savings your family could use. Our worked example has $100,000.00 of existing cover and $25,000.00 of liquid savings — $125,000.00 already held. Subtract it: $1,230,000.00 minus $125,000.00 is $1,105,000.00 — the recommended coverage. Every dollar already held is a dollar less to buy: $500,000.00 of existing cover cuts the recommendation to $705,000.00.
Step 7 — Check the result against the life insurance needs calculator
Run the same numbers through the life insurance needs calculator and check that it gives the same $850,000.00, $1,230,000.00, $125,000.00 and $1,105,000.00 — if it does not, one of the numbers is wrong, and that is the number to re-check. Then try the edges: the smallest whole-dollar income for the recommendation to reach $1,500,000.00 is $124,500.00; the smallest whole number of years is 15; and $455,000.00 of existing cover brings it down to $750,000.00.
Three worked examples
Twenty years instead of ten. Stretch the replacement to 20 years and the income replacement doubles to $1,700,000.00, the total need becomes $2,080,000.00 and the recommended coverage jumps to $1,955,000.00. The years are the longest lever in the DIME method — twice the years is twice the replacement.
A lower income over more years. Earn $60,000.00 a year and replace 15 years of it: the replacement is $900,000.00, the total need is $1,280,000.00 and the recommended coverage is $1,155,000.00. The years matter as much as the income — a modest income over a long horizon still needs a large number.
Already holding half a million. With $500,000.00 of existing cover the family already holds $525,000.00, so the recommended coverage falls to $705,000.00. The subtraction is the step people skip — and it is the step that saves the most money.
The already-covered rule
If what you hold beats the need, the answer is $0, not a negative number. With $1,500,000.00 already held against a $1,230,000.00 need, the family is already covered — the recommended coverage is $0. The same rule covers the all-zero case: with nothing to replace and nothing owed, the need is $0 and the recommendation is $0. A negative recommendation would mean the insurer pays you, which is not how life insurance works.
What the number does not tell you
The number is a plan, not a promise: it counts today’s income, not the pay rises or inflation ahead; it counts today’s mortgage, not the balance after years of payments; the education fund is a guess about costs years away. It counts no taxes, no employer cover, and no Social Security survivor benefits; and it assumes the years you pick are the years your family would actually need. The term vs whole life insurance calculator covers which type of policy to buy once you know the amount. Use the number to size the cover — then review it after big life changes (marriage, a child, a new mortgage, a pay rise).