An emergency fund is sized on essentials, not your full salary: what it costs to keep the household running for a month with no income. Itemise your essentials below (or type a monthly total), pick how many months to cover, and see your target, what is left to save, and the month you will get there. Everything updates live in your browser. The defaults are the worked example.
The maths: target = monthly essentials × months to cover. Months to target = what is left to save ÷ monthly saving, rounded up — a part-month of saving still takes a calendar month to land.
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Size your emergency fund from itemised monthly essentials: a 3–12 month target, what you still need to save, how long it takes, and the month you reach it.
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Size your emergency fund from what your household actually spends to stay afloat: itemised monthly essentials — housing, food, utilities, transport, insurance and minimum debt payments — multiplied by the months of cover you choose, then compared with what you have already saved to show the gap, how long it takes to close, and the month you get there.
Essentials of $3,200 a month — housing $1,200, food $600, utilities $250, transport $300, insurance $350 and minimum debt payments $500 — with a 6-month target give a fund of $3,200 × 6 = $19,200. With $5,000 already saved, $19,200 − $5,000 = $14,200 is still to save. At $500 a month that is $14,200 ÷ $500 = 28.4 months, rounded up to 29 months — so the fund is complete 29 months from now, and the calculator names that month and year.
Target fund = monthly essential expenses × months to cover. Still to save = target − current savings, floored at zero. Months to target = still to save ÷ monthly saving, rounded up to the next whole month (a part-month of saving still takes a calendar month to land), and the target date is that many months from today. Funded % = current savings ÷ target × 100, capped at 100. Essentials deliberately exclude discretionary spending — the fund only has to cover the spending that cannot stop.
Three months is the usual floor and suits dual-income households with stable jobs. Six months is the standard recommendation. Nine to twelve months fits single-income households, the self-employed and anyone with variable or gig income — the calculator’s stability guidance walks through which fits, but the choice of months is always yours.
The spending that cannot stop if income stops: housing, basic food, utilities and phone, transport to work, insurance premiums and the minimum payments on debts. Subscriptions, eating out and holidays are not essentials — in a real emergency month you would pause them, which is exactly why the fund is sized on essentials rather than your full salary or full spending.
Either — they are the same number two ways. The rows are better if you are not sure what your essentials add up to, and they expose costs people forget (insurance premiums and minimum debt payments are the usual ones). The single total is quicker if you already track your spending; typing it overrides the rows until you edit a row again.
In an instant-access savings account, separate from your everyday account so it is not spent by accident, but reachable the same day a boiler or car fails. Not invested — the fund’s job is to be there at full value on a bad week, not to grow. Once it passes your target, extra savings can move to longer-term goals.
Start anyway, and aim first for a starter fund of one month of essentials — that already absorbs most everyday emergencies. The calculator shows the honest timeline at your current pace; raising the monthly amount even slightly shortens it more than people expect, because every month is a whole month off the date.
No — it is emergency borrowing. It works only while the lender keeps it available (limits can be cut exactly when times get hard), and it charges interest on top of the emergency. A cash fund costs nothing to use and cannot be withdrawn by anyone else, which is the whole point of building one.
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