Emergency Fund Calculator: How Much to Save and When (Free)

This calculator runs entirely in your browser: nothing you type is uploaded, stored or sent anywhere, and it keeps working with the connection off. It answers the question an emergency fund actually starts with, which is not how much you should save but how much one month of your life costs when it is stripped back to the things that cannot be cancelled. Type that figure, choose how many months of cover you want, subtract what you already have, and the gap is the only number left to plan around. Add a monthly contribution and the gap becomes a timeline.

Under the result, a table repeats the calculation at one, three, six and twelve months of cover, which turns the choice between them into months of saving rather than a feeling. Where the savings goal calculator works backwards from a target you already know, this page works out what the target should be. The two are meant to be read together: this one sizes the cushion, that one plans the trip to it.

How to use it

1. Start with your essential monthly costs. This is the field people get wrong, and getting it wrong is what makes an emergency fund feel impossible. It is not your normal monthly spending. It is what a stripped-down month costs: the bills that keep arriving after the income stops.
2. Pick the months of cover. Three, six, nine or twelve. The tool defaults to six because that sits in the middle of the range most public guidance names, though the right answer depends on your household rather than the convention.
3. Add what you already have, counting only money you could reach within a few days and would genuinely spend on an emergency. A pension you cannot touch for thirty years is not cover. The note under the result turns the figure into months of essentials already covered.
4. The monthly contribution is the amount you would still transfer in a bad month, not the amount a good month could manage. The calculator divides the gap by it and rounds up to whole months. Leave it at zero and the page shows the target and the gap and stops, which is a perfectly legitimate way to use it.
5. Then read the table. Four rows, one per level of cover, each with its own target and its own time to reach it at your contribution. Seeing that six months costs two years of saving while one month costs two makes the first milestone obvious.

What the target and the gap mean

The arithmetic is deliberately plain. The target is your essential monthly costs multiplied by the months of cover. The gap is the target minus what you have, floored at zero. The time is the gap divided by your contribution, rounded up, because a month either contains a transfer or it does not. The note underneath divides what you have by one month of essentials, which is the most useful number on the page: it says how long you could keep the lights on with no income at all.

No interest is applied. Over the horizon most funds take to build, interest on an instant-access balance moves the answer by a few weeks, and a rate field would imply a precision the plan does not have. Leaving it out makes the result slightly pessimistic, which is the right direction to be wrong in.

The other field worth being honest about is the contribution. People type the number a good month produces, then watch the timeline slip and conclude the calculator lied. It did not. Put in the figure that survives a month with a dentist in it, and the date it gives you is a date you can keep.

What counts as an essential

An essential is a cost that keeps arriving when the income stops and that you cannot cancel with a phone call: rent or mortgage, utilities including heating and water, food, transport to work, insurance premiums, minimum debt payments, childcare and regular medication. Council tax, property tax or the local equivalent belongs there too, as does anything the household would be evicted, disconnected or defaulted over.

What does not belong: subscriptions, streaming, restaurants and takeaways, holidays, clothes beyond replacement, gym memberships, gifts, hobbies. These are real spending, but every one of them can be stopped in a week. Including them can add a third to the target, and a target inflated by a third takes a third longer to reach, which is how a reasonable plan becomes an abandoned one.

The distinction the field is really asking about is the one in fixed vs variable expenses, applied with a harder filter: not what is predictable, but what is unavoidable. An emergency month is also not a normal month. Groceries fall when nobody is commuting, fuel falls, childcare sometimes falls. Many people find their honest essentials figure sits well below their normal spending, which makes the whole target smaller than they feared.

If you have never separated the two, the fastest route is a month of real data rather than an estimate. How to track expenses on iPhone covers the logging habit, and how to track subscriptions and recurring bills separates the recurring lines that are essential from the ones that only feel that way. The subscription cost calculator prices the second group annually, which is often where the first monthly contribution comes from.

One more boundary is worth drawing. An emergency fund covers the unexpected. Predictable large costs are not emergencies even when they arrive as a lump: annual insurance, a car service, replacing a laptop, December. Those belong in a sinking fund, planned with the savings goal calculator. Keep them out of this number and the fund stops being drained by things that were on the calendar all along.

Three months, six months, or something else

Three to six months is a convention. Public bodies including the CFPB repeat it because it is a reasonable starting point for a wide population, not because a calculation behind it produces the number six. Treat it as the middle of a distribution, then ask what moves you along it.

The biggest one is whether the household has one income or two. Two earners are unlikely to lose both incomes in the same month, so each loss is partly absorbed. A single earner loses everything at once. That single fact is why the same job in the same city justifies three months for one person and nine for another.

Geography comes second, and it is where most advice on this subject quietly fails, because a great deal of it is written for the United States without saying so. In much of the EU a statutory or contractual notice period runs to one, two or three months and is paid, and unemployment insurance then replaces a substantial share of the previous salary for a further period measured in months rather than weeks. A German, Dutch or French employee is bridging a shorter and shallower gap than an at-will employee in the US, so the lower end of the range is easier to defend. None of that protection reaches the self-employed in most systems.

Which brings up the other end. Freelancers and contractors carry both risks at once: income that can halve without anyone being dismissed, and little or no statutory cover when it does. Nine or twelve months is the usual recommendation, and the fund ends up doing two jobs, smoothing ordinary volatility as well as covering catastrophes.

Three smaller factors push in the same direction. Dependants and health, because children, an elderly parent, a partner who does not earn or a chronic condition all raise the essentials figure and lengthen the time it takes to replace an income. Housing, because a mortgage cannot be renegotiated quickly and neither can rent under a fixed-term lease, while someone who could move in with family has an escape valve a mortgage holder does not. And how replaceable the job is: a skill in demand across a large city is a different risk from a specialist role with three employers in the country, and hiring gets slower the more senior you are.

None of this is theoretical. The Federal Reserve's SHED has asked Americans the same question about a four hundred dollar unexpected expense every year for over a decade, and a substantial minority consistently report they could not cover it with cash or its equivalent. Eurostat asks a comparable question across the EU under the heading of inability to face unexpected financial expenses, and a large minority answers the same way. Whatever target you choose, you are choosing your way out of a very common position.

Start with one month

If you take one thing from this page, take this: the first milestone matters more than the final target. The protective effect of a cushion does not wait until six months are in the account. CFPB research behind its Start Small, Save Up work found that households with only a few hundred set aside were measurably less likely to be evicted, to miss a payment, or to turn to high-cost credit than households with less. The difference shows up at a few hundred. Not a few thousand.

That is the argument for the one-month row in the table. It turns a target that might be forty months away into one that is two or three months away, and two or three months is a distance the habit actually survives. One month of essentials will not carry a household through redundancy. It will absorb the car repair, the insurance excess, the vet, the boiler part, all the things that otherwise become an overdraft or a card balance still sitting there a year later.

The practical version: set the calculator to one month, reach it, then re-open the page and set it to three. The contribution does not change; only the row you aim at does. The savings goal calculator is the right tool for each leg, since it takes any target and contribution and returns a date. If the contribution itself is what is missing, the 50/30/20 budget calculator gives a first estimate from take-home pay, and the net worth calculator puts the fund against everything else you own and owe.

Where the money should sit

Two properties matter, and only two. The money has to be separate from everyday spending, and it has to be reachable within days.

Separate matters because a balance that shares an account with groceries is not a fund, it is a slightly higher current account balance, and it gets spent a little at a time without anyone deciding to. Public guidance from the CFPB puts separation ahead of any product choice, and it is the part of the advice that survives across countries and interest rate environments.

Reachable matters because an emergency has a deadline. Money tied up for ninety days does not pay for a boiler that failed on Tuesday, and money that must be sold at whatever price the market offers that week is not cover either, since the events that cost people their jobs often move markets too. A fund is not an investment; it is insurance you are self-underwriting.

Beyond those two properties, the choice of account type depends on your tax position, your currency and your circumstances. Instant access, notice accounts, money market products, whatever is standard where you live, the deposit protection limits that apply to each: that is a question for a qualified adviser, not for a calculator. This page will not tell you what to buy. Any page that does, without knowing your situation, should be read with care.

Four households, four targets

A single earner in the US, essentials $1,600 a month, $1,200 already set aside, putting away $200. At six months of cover the target is $9,600 and the gap is $8,400, which at $200 a month is 42 months, or 3 yr 6 mo. Discouraging. That is exactly why the table is there: the one-month row is a target of $1,600, a gap of $400 and a time of 2 months, with the note reading 0.8 months already covered. Three months costs $4,800, a gap of $3,600, and 1 yr 6 mo.

A couple with two incomes look different. Household essentials £2,400, £2,000 set aside, £325 a month between them. Two incomes and contractual notice on both sides make three months a defensible first target: £7,200, a gap of £5,200, 16 months to close it. The six-month row is £14,400 and 39 months, which reads as a reasonable second stage rather than a reason to give up on the first. One thing to watch: the essentials figure here covers the household, so the contribution has to as well.

Someone self-employed, essentials €2,100, €4,200 set aside, €600 a month. The note reads 2.0 months covered. With no notice period and no statutory unemployment cover, nine months is the sensible target: €18,900, a gap of €14,700, 25 months, or 2 yr 1 mo. The six-month row, €12,600 with a gap of €8,400 and 14 months, makes a useful staging post. A freelancer should also keep tax money entirely outside this figure. It was never theirs. The VAT calculator splits an invoice into the part that is income and the part that is only passing through.

The fourth case is the one nobody types in: already covered. Essentials €1,500, €10,000 set aside. At six months the target is €9,000, so the result reads Reached and the note says 6.7 months. Worth doing, because people carry on feeding a fund that finished its job two years ago while some other plan waits its turn. Once the fund is done the contribution is free to move on, to a sinking fund, a debt or a goal, and the debt payoff calculator helps frame that choice.

Tracking it in Cash Book

A target on a page is a plan. A balance that moves is a fund. Cash Book is built for the second part.

The fund itself lives in Accounts. A savings account sits beside cash and cards with its own balance, a transfer into it is logged like any other transaction, and the Accounts screen shows one net-worth number across all of them. No goal feature, no progress ring. Just a balance that goes up by the contribution each month, which is the same information with fewer settings to fiddle with. There is no bank connection either, because Cash Book never links to a bank, so the transfer is one you make and then log.

The essentials figure is the part most people skip, and Insights is where it should come from. Rather than estimating what a stripped-down month costs, group the unavoidable tags into a category and read the actual month. The month switcher, the per-tag breakdown and the six-month income versus expense bars give you a real figure across several months instead of a guess made on a Sunday evening.

Then there is protecting the contribution, which is what Budgets are for. A monthly allowance under the Home number, or a per-tag cap on whichever categories keep absorbing the money that was meant to be saved, stops the transfer from quietly becoming optional.

All of that depends on transactions being logged, which is why voice logging matters more here than it looks. An essentials figure built from incomplete data comes out low, and a fund sized from it comes out small.

For the routine around it, how to make a monthly budget that sticks covers where the contribution comes from, and how to stop impulse buying covers the spending that most often replaces it. If some essentials are shared, the bill split calculator settles who owes what before the transfer goes out, and how to track cash spending closes the gap for anything paid in notes.

Set one month as the first target, reach it, then choose the next row. The number at the top of this page is a destination; the transfer each month is what makes it true.

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Get Cash Book on the App StoreFree for 7 days. $19.99 once for lifetime.