Your safety net

Emergency Fund Runway Calculator: How Long Will Your Savings Last?

KOLLAZ · Updated October 1, 2026

The morning after a layoff, one question beats all the others: how long will your money last? Not the textbook answer. Not the number your brother-in-law throws around at dinner. The real number, built from your actual cash and your actual bills.

An emergency fund runway calculator answers it with simple division:

Cash on hand ÷ monthly survival burn = months of runway.

Got $18,000 in the bank and a household that needs $3,200 a month to keep the lights on? That's 5.6 months before severance, before unemployment benefits, before anything else. Everything below builds on that one line of math: how to find your real numbers, why the famous “3–6 months” rule can mislead you, and how severance and unemployment stretch the answer. (Updated October 2026.)

How does your emergency fund runway calculator work in one line?

Two inputs, both honest. First, total cash you could spend tomorrow: checking, savings, the emergency fund, cash in the drawer. Leave out retirement accounts: pulling from those early can mean taxes and penalties you can't afford right now. Second, your monthly survival burn: not your normal spending, the stripped-down version. Rent or mortgage, utilities, groceries, health insurance, minimum debt payments, transport. One line each, nothing decorative.

Divide the first number by the second. That's your runway in months, assuming no new income. It isn't a plan yet. It's a clock. And knowing exactly how loud it ticks is what lets you make calm decisions instead of panicked ones.

How do you compute your runway in 5 steps?

This is the whole procedure. Grab a notebook or a spreadsheet and work it once. Twenty minutes, tops.

1. Add up your spendable cash. Checking, savings, money-market accounts, cash on hand. Everything you could put toward a bill tomorrow morning.
2. List your monthly survival costs. Rent or mortgage, utilities, groceries, health insurance, minimum payments on every debt, transport, phone. One line each, real amounts from your last three statements.
3. Cut to the survival version. Subscriptions pause. Dining out pauses. The streaming services, the gym you haven't visited since spring. All of it goes on hold. What's left is your monthly survival burn. If your household income was already up and down before the layoff, this survival-number exercise pairs well with our piece on budgeting with irregular income.
4. Divide. Cash on hand ÷ monthly survival burn = months of runway. No other income, no heroics.
5. Layer in your offsets. Severance, unemployment benefits, a partner's income, any side cash. Each one adds months, the worked example below shows exactly how.

Why can the “3–6 months” rule lie to you?

You've heard it forever: keep three to six months of expenses saved. Many experts do suggest three to six months of basic living costs as the target. That's decent advice for calm times. But a layoff breaks the assumptions hiding inside it.

First, your burn is wrong. Health insurance is the big one: while you were employed, your company paid most of your premium. Continue that same plan under COBRA and you can be charged the entire premium plus an administration fee of up to 102% of the plan's cost, per the Department of Labor. Your “monthly expenses” just grew a few hundred dollars overnight.

Second, new costs show up that the rule never priced in: job-search expenses, resume help, maybe a move. Third, income arrives in strange shapes: a lump-sum severance here, biweekly unemployment checks there, which a flat “months of expenses” number can't handle.

So don't ask “do I have six months saved?” Ask “six months of what?” A six-month fund measured at your old spending can be a four-month fund at your real survival burn. For sizing the fund in normal times, our emergency fund calculator guide walks through the target; this article is about what that number means when the paycheck stops.

What does a worked example show with $18,000 in the bank and $3,200 a month?

Take a fictional household. They have $18,000 in spendable cash and a $3,200 monthly survival burn. Step 4 gives:

$18,000 ÷ $3,200 = 5.6 months of runway, no offsets.

Now layer in the offsets. First, severance: a $8,000 lump sum lands in their account. Cash becomes $26,000.

$26,000 ÷ $3,200 = 8.1 months.

Then unemployment: say their state pays $1,800 a month and it lasts six months in this example. While benefits flow, their net burn drops to $3,200 − $1,800 = $1,400 a month. Six months at that pace costs $8,400, leaving $17,600. After benefits end, the burn returns to $3,200:

$17,600 ÷ $3,200 = 5.5 more months, for a total of about 11.5 months.

Watch what happened: the raw “5.6 months” almost doubled once severance landed, then nearly doubled again once unemployment entered. That's the whole point of the offsets: they don't just add money, they shrink the monthly hole. But treat this as a demonstration, not a promise: your state's benefit amount, duration, and waiting rules will differ from these numbers.

What is the unemployment-timing trap?

Unemployment insurance is run by the states, not by Washington. The Department of Labor is explicit that the program provides benefits to eligible workers “as determined under state law,” which means the amount, the duration, and the waiting rules where you live can look nothing like your friend's in another state.

Two things follow. First, file as soon as you can. In general, you can't collect benefits for weeks before you filed, so a week of “I'll get to it” is a week of runway burned for nothing. Second, keep your paperwork tight: the layoff letter, recent pay stubs, your claim confirmation. Appeals and corrections happen, and the person with documents wins them faster.

One more wrinkle: severance and unemployment don't always stack neatly. In some states, a severance payout can delay or reduce your benefits. Check your state's rules before you count both in full. The DOL page above links out to every state's program.

What is the difference between severance as a lump sum vs. salary continuation?

Not every layoff comes with severance. Many come with nothing, which is exactly when your runway number matters most. When there is a package, it usually takes one of two shapes, and they hit your math differently.

A lump sum is one payment. It goes straight into cash on hand and extends your runway the day it lands, exactly like the $8,000 in the example above. A salary continuation keeps paychecks coming for a set number of weeks or months, and it often keeps your health coverage running too, which spares you the COBRA shock from the last section.

Whatever you're offered, get the final terms in writing before you sign anything. A verbal “we'll take care of you” is not a number you can put in a spreadsheet. And don't assume the first offer is the last word: severance terms are sometimes negotiable, especially around the payout structure and the end date of your benefits.

What do you do in the first 48 hours?

Shock makes people freeze, and freezing is expensive: missed filing windows, lapsed coverage, decisions made at midnight. The antidote is a dated to-do list. Ours covers the milestones that actually move the needle: your last day, your last paycheck date, the day you file for unemployment, the day your health coverage ends, the COBRA election deadline, the window for deciding what to do with your 401(k) (leaving it, rolling it to an IRA, or moving it to a new employer's plan are the usual options; cashing out early can mean taxes and penalties), and 14/30/90-day checkpoints to re-run your runway number as reality changes.

The Layoff Survival Runway Kit spreadsheet pairs a five-tab runway calculator with a printable “First 48 Hours After a Layoff” checklist, so the shock turns into a dated plan instead of a spiral. It passed a live Google Sheets import test and a real Excel review in October 2026, so it works wherever you keep your files.

What is the one number to walk away with?

Run the division today, before you need it, and run it again the week a layoff lands, because severance and benefits change the math. A household that knows it has eleven months behaves very differently from one guessing it has “a while.” That difference is calmer negotiations, smarter spending, and no panicked decisions at 2 a.m.

Disclaimer: This article is educational information, not financial advice. Unemployment rules, the tax treatment of severance, and benefit programs differ by state, province, and country. If your numbers get complicated, talk to a licensed financial professional.

Sources

• U.S. Department of Labor, “How Do I File for Unemployment Insurance?” (undated; accessed October 2026).

https://www.dol.gov/general/topic/unemployment-insurance Substantiates that the Federal-State Unemployment Insurance program's eligibility and rules are set under state law, which is why benefit amounts and timelines differ by state.

• Washington State Department of Financial Institutions, “Building an Emergency Savings Fund” (undated; accessed October 2026).

https://dfi.wa.gov/financial-education/information/importance-having-emergency-savings-account Substantiates the widely cited guideline of saving three to six months of basic living costs for an emergency fund.

• U.S. Department of Labor, “Continuation of Health Coverage (COBRA)” (undated; accessed October 2026).

https://www.dol.gov/general/topic/health-plans/cobra Substantiates the right to continue employer health coverage after job loss and that qualified individuals may be charged up to 102% of the plan's premium cost.

About Kollaz, Kollaz makes smart financial tools for modern money. This article's companion is the Layoff Survival Runway Kit spreadsheet: a five-tab runway calculator with severance and unemployment offsets, milestone tracking, and a printable first-48-hours checklist.