Emergency Fund Calculator

This turns a reserve you describe in months into the three figures you can act on. The target is your monthly essential expenses multiplied by the number of months you chose. The shortfall is how much of that you do not yet have. The coverage figure runs the division the other way and says how many months the money already set aside would carry you, which is usually the most sobering number on the page because it is the one that describes your position today rather than your intention. If you are adding something each month it also reports how long the remaining gap takes to close at that rate, counted in whole months and rounded up, since a fund that is 90% full is not an emergency fund. Nothing here earns interest, because a reserve you might need on a day’s notice does not belong anywhere its value can move.

The arithmetic takes about ten seconds and the input that matters is the one nobody can give you. So it is worth being clear about which part of this page is arithmetic and which part is a choice.

Start with the choice. "Three to six months of expenses" is the most repeated piece of personal finance advice in circulation, and it is a convention rather than guidance. The Consumer Financial Protection Bureau publishes a guide to building an emergency fund and it names no months figure anywhere: its answer is that "The amount you need to have in an emergency savings fund depends on your situation", and the method it actually suggests is to look backward — "Think about the most common kind of unexpected expenses you've had in the past and how much they cost". That is a different exercise from multiplying your rent by six, and for some people it produces a much smaller number. This page defaults to six months because it has to default to something, and every label around that field says it is yours to set.

What should move it? Chiefly how replaceable your income is and how many people depend on it. Two earners in steady demand can reasonably sit at the low end; a single income, a commission-based one, a contract that renews annually, or a household where one illness stops the earning all argue for the high end. Self-employment argues for the high end twice, because income can stop and a tax bill can arrive in the same quarter. None of that is arithmetic and this page does not pretend to weigh it for you.

Now the arithmetic, which is exact. On the default scenario — $3,200 of monthly essentials, six months of cover, $8,000 already set aside, $500 going in each month — the target is $19,200 and the shortfall is $11,200. At $500 a month that gap closes in 23 months.

The third figure is the one worth sitting with. $8,000 against $3,200 of monthly essentials is 2.5 months of coverage. That is the number that describes where you actually stand, and it is a considerably less comfortable sentence than "I'm saving towards six months". Most people know their balance and have never divided it by their monthly outgoings, and the division is the whole point of doing this.

The timeline is very sensitive to the contribution and not at all linear. Holding the default target, $100 a month takes 112 months, $250 takes 45, $500 takes 23, $800 takes 14 and $1,200 takes 10. Doubling what you put aside more than halves the wait at the low end, because the amount is small relative to the gap; by the time you are at $800 the returns to adding more have flattened. If the honest figure you can contribute produces a timeline in the nineties, that is an argument for lowering the target rather than for a number you will not sustain.

Which brings up the thing the months ladder shows clearly. From the same starting position, a 3-month target is $9,600 and 4 months away; 4 months is $12,800 and 10 months away; 6 months is $19,200 and 23 months away; 9 months is $28,800 and 42 months away; 12 months is $38,400 and 61 months away. The target grows in a straight line and the wait does not, because the savings you already have cover a fixed dollar amount and therefore a shrinking fraction of a growing target. At a 3-month goal the existing $8,000 cuts the wait by a factor of five — 20 months from zero against 4 with it. At 12 months it cuts it by a factor of 1.26. A larger goal is not just further away; the head start you already have counts for less against it.

For context rather than as a target: the Federal Reserve's Survey of Household Economics and Decisionmaking asked this directly in October 2025, and 55 percent of adults said they had set aside money to cover three months of expenses. Thirty percent said they could not cover three months by any means, including borrowing or selling something. The same survey found 63 percent could cover a hypothetical $400 emergency expense using cash or its equivalent, and 12 percent said they would be unable to pay it at all. Those are measurements of where people are, not statements about where you should be, and the spread by income is wide — 21 percent at family incomes under $25,000 against 75 percent at $100,000 or more.

One structural point about the reserve itself. This page applies no interest rate and models no growth, and that is deliberate rather than an omission. The defining property of an emergency fund is that its full value is there on an arbitrary Tuesday. Anything that pays a meaningful return can be lower on the day you need it, and job losses in particular arrive correlated with the conditions that depress asset prices. The CFPB's criteria for where to keep it are that the money is "safe, accessible, and in a place where you're not tempted to spend it on non-emergencies" — three properties, none of which is yield.

The target is the easy part: $3,200 x 6 = $19,200. Against $8,000 already there, the shortfall is $11,200, and at $500 a month that takes 23 months — a little under two years.

Before accepting that, run the division the other way. $8,000 divided by $3,200 is 2.5 months of coverage. That is the figure to hold onto, because it is the one that describes the position rather than the plan. Two and a half months is real protection — it covers a transmission, a deductible and a slow month at the same time — and it is not six.

Now test whether six is the right target at all. At $500 a month the ladder from this starting point runs: 3 months of cover costs $9,600 and arrives in 4 months; 4 months costs $12,800 and arrives in 10 months; 6 months costs $19,200 and arrives in 23 months; 9 months costs $28,800 and arrives in 42 months; 12 months costs $38,400 and arrives in 61 months. The interesting jump is the first one. Going from where you are to a 3-month fund takes four months of saving. That is a small, finishable piece of work that moves you from 2.5 months to a genuinely complete three-month reserve, and there is a good case for banking it before deciding whether to continue to six.

The contribution matters more than the target does. Hold six months fixed and vary only what goes in: $100 a month takes 112 months — over nine years, which is long enough that the expenses figure the target was built from will no longer be accurate. $250 takes 45 months. $500 takes 23. $800 takes 14. $1,200 takes 10. The step from $100 to $250 saves 67 months; the step from $800 to $1,200 saves 4. If a realistic contribution puts the answer years out, the useful response is a smaller target reached soon rather than a larger one reached theoretically.

It is also worth seeing what the existing savings are doing. Starting from $0 instead of $8,000, the same 6-month target at $500 a month takes 39 months rather than 23. The $8,000 bought 16 months. At a 3-month target it buys 16 months as well — 20 months from zero against 4 — but that is a factor of five rather than a factor of 1.7, which is why an early, smaller goal makes the head start count for so much more.

Two edge cases the page handles rather than fudges. If you set the contribution to zero — an honest answer for anyone whose budget currently has no room — the target, the shortfall and the coverage all still compute and the timeline row disappears entirely. There is no number of months in which $11,200 is saved at $0 a month, and printing "0" or a dash there would be inventing an answer.

And if the savings already exceed the target, the shortfall does not go negative. $18,000 against a $18,000 target reports as funded, and $25,000 reports as funded with a surplus — 8.3 months of coverage against a 6-month goal, with $7,000 spare. That surplus is worth naming, because money sitting in a cash reserve beyond the point it is needed there is the one part of this calculation with a genuine opportunity cost attached.