Balance divided by monthly spending. It is the first sum anybody does, it takes ten seconds, and it is the number that decides how frightened you are for the rest of the week. It is also wrong three times over: it ignores the money still coming in, it ignores the new expense that arrives with the layoff, and it usually uses a burn figure that was never measured.

The three things left out

Income does not stop dead. Severance may be paid as a lump sum or as salary continuation. State unemployment replaces part of your prior wage for a period the state sets. A partner's pay, freelance work, or rental income keeps arriving. All of it belongs in the calculation, and leaving it out is what makes the first estimate feel like a cliff.

A new expense arrives. Health cover moves from a payroll deduction to the full premium, and that single line often moves the date more than anything you could reasonably cut. And the burn is usually a guess. Not what you would like to spend — what genuinely leaves the account: housing, food, utilities, insurance, minimum debt payments. Measure a month before you plan around it.

A worked example

Twenty-five thousand in savings and forty-two hundred a month going out. The ten-second sum says six months, and that is the number most people carry around for the rest of the day.

Now put the health premium in. Six hundred and fifty a month of COBRA takes the burn to four thousand eight hundred and fifty, and the same savings now cover 5.2 months. That is the direction nobody expects the number to move first, and it is why doing this properly matters rather than being reassuring.

Then the income goes in. Two months of salary continuation at six thousand, and twenty-six weeks of unemployment at four hundred and fifty a week beginning when the continuation ends. Against that same burn the runway comes out at 10.0 months — the benefits are worth 4.9 months on top of the 5.2 the savings cover alone.

Six, then 5.2, then 10.0, from one set of figures. Every one of those numbers is defensible and only the last one is useful, which is the entire argument for doing the whole calculation instead of the fast one. Ten months is not good news. It is a different set of decisions from five.

Stretching it, in the order that pays

Once there is a date, the levers become measurable rather than moral. Trimming the burn moves it, and it moves it more the earlier you do it, because the saving compounds across every remaining month. Pricing the health cover properly — a marketplace policy against COBRA — can be worth more than every subscription you might cancel put together. And a start date a month earlier is worth exactly one month of burn, which is often the largest single lever in the whole picture.

The point of the arithmetic is not to make you cut everything. It is to show you which cuts are worth weeks and which are worth days, so the fortnight goes on the ones that count.

The honest caveats

Severance and unemployment are taxed and the withholding varies. States differ on whether unemployment can be drawn while salary continuation is running. COBRA premiums, election windows and caps vary by plan and by state. Every figure above is an estimate of a situation nobody has looked at, which is the nature of a worked example.

Verify eligibility and the weekly amount with your state agency, and get the real premium from the plan administrator. Then put your own numbers in rather than these.