Savings & Banking

Emergency Fund Runway Calculator

An emergency fund buys time. Enter your savings and monthly expenses to see how many months you could cover if your income stopped — your runway. Add any partial income (severance, a side gig, unemployment) to see how much longer it lasts.

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Emergency savings

Essential monthly expenses

Lean-month spending: housing, food, utilities, insurance, minimum debts.

Income during the gap (optional)

Partial income like unemployment, a side gig, or a partner's earnings.

Your runway

6 months

6 full months of essential expenses covered.

Emergency savings: $30,000
Monthly burn rate: $5,000
3–6 month target range: $30,000

Compare scenariosTry three values of one input

Vary

Emergency Fund Runway Calculator results for three values of Emergency savings
Emergency savings
Your runway	5 months	6 months+1 month	7 months+2 months
Emergency savings	$27,000	$30,000+$3,000	$33,000+$6,000

Every other input stays at the value you set above — currently $30,000 for emergency savings. Differences are measured against the first column.

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How this calculator works

Runway (months) = savings ÷ monthly burn rate, where burn rate is essential expenses minus any income during the gap. When income covers expenses, the burn rate is zero or negative and savings last indefinitely.

A simple division that assumes steady expenses and a constant partial income, and ignores interest earned on the savings (small over a few months). Use it to gauge your cushion, then aim for the 3–6 month range appropriate to your situation.

What this assumes

Your lean monthly spending, not your normal spending — in a real emergency the discretionary part goes.
No income at all during the period, which is the pessimistic case. Partial income extends the runway proportionally.
No unemployment benefit, severance or support is included.

What changes this number

Lean monthly spending: Usually about a third below normal spending, which is why sizing on income overstates the target.
Fixed costs: Housing dominates and cannot be cut quickly, which is why a high rent shortens runway more than any other line.
Current balance: The only input you can change today, and the reason automatic transfers beat intentions.

A worked example

Take the $30k savings, $5k expenses scenario. These figures are produced by the calculator above, not written alongside it, so they always match what the tool returns.

What you enter

Emergency savings: $30,000
Essential monthly expenses: $5,000

What it returns

Your runway: 6 months
Emergency savings: $30,000
Monthly burn rate: $5,000
3–6 month target range: $30,000

Try an example

$30k savings, $5k expenses With $2k partial income Thin cushion

Frequently asked questions

How long should my emergency fund last?

The common guideline is three to six months of essential expenses. Three months suits a stable dual-income household; six or more is safer for a single earner, variable income, or anyone whose job would be slow to replace. This calculator shows how many months your current savings actually cover.

What counts as essential expenses?

Your lean-month survival spending: housing, food, utilities, insurance, transportation, and minimum debt payments. In a real emergency you'd cut discretionary costs like dining out and subscriptions, so your true burn rate is lower than your normal spending — which makes your runway longer than you might expect.

How does partial income affect my runway?

It stretches it, sometimes dramatically. If unemployment, a side gig, or a partner's income covers part of your expenses, your savings only need to cover the shortfall — your 'burn rate.' If that income fully covers expenses, your savings aren't drawn down at all and your runway is effectively indefinite.

Where should I keep my emergency fund?

Somewhere safe and instantly accessible — a high-yield savings or money market account, FDIC-insured and earning a real rate. It shouldn't be invested in stocks, which could be down exactly when you need the cash, and it should be separate from your checking so it isn't spent by accident.

This calculator helps answer

Am I saving enough?

Check your savings rate, size your emergency fund on lean spending rather than income, and see whether the total is on track for what you want later.