Emergency Fund Calculator
↻ Updated 2026Find out how big your emergency fund should be based on your essential expenses and desired months of coverage — plus the monthly amount to close the gap.
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Runs entirely in your browser — nothing you enter is sent to us.How this works
How to read your emergency fund target
Two numbers, and they answer different questions. The target ($21,000 on the defaults) is your expenses times your coverage months — a fact about your fixed costs, not about your income or your savings. The monthly figure ($1,416.67) is just the gap divided by your deadline, which means it's a statement about the deadline you picked rather than about what's achievable.
How your emergency fund target and monthly savings are worked out
This is the simplest model on the site, and that's a deliberate choice rather than a shortcut. An emergency fund is measured in time, not dollars — the question isn't "how much do I have" but "how long could I cover my costs with it". Multiply what a month costs by the number of months you want, and you've converted a span of time into a balance.
The monthly figure then divides the shortfall by your deadline. Straight-line, no interest, no growth. On a fund this size over a horizon this short, the interest is real but small — and the calculator would rather be slightly pessimistic about a number you're relying on than slightly optimistic.
target = monthly essential expenses × coverage months gap = max(0, target − current savings) monthly need = gap ÷ months to fully fund % funded = min(100, current savings ÷ target × 100) if current savings > target: surplus = current savings − target (and monthly need = 0)
- monthly essential expenses
- What one month costs if you cut everything optional — not your income and not your usual spending — the floor beneath which you can't go
- coverage months
- How many months of that floor you want banked — 3, 6, 9 or 12 — the dropdown's four options
- current savings
- What's already set aside and reachable — liquid only; money in a CD or a 401(k) isn't an emergency fund
- months to fully fund
- Your self-imposed deadline — the only input with no right answer — it sets the monthly figure entirely
- gap
- What's still missing — floored at zero, so an over-funded account reports a surplus instead of a negative gap
The coverage dropdown labels 6 months "standard" and that reflects where published guidance clusters, though the guidance is softer than the label. The CFPB's emergency-fund guide declines to name a single figure at all, framing the target around your own recurring costs and noting that any cushion beats none — and it's explicit that starting small is the point. Fidelity and Vanguard both describe three to six months of expenses as the conventional range, with more for variable income or a single-earner household.
Something the arithmetic makes visible that the advice doesn't: because the target keys off expenses rather than income, a raise doesn't raise your target and a cheaper apartment lowers it permanently. Two people earning the same salary can have targets $20,000 apart, and the one with the smaller target reaches it faster while saving less each month. The fund is sized by your costs, so the same thing that makes it easier to fund is the thing that makes it smaller.
Worked examples
Example: $3,500 a month in essentials, 6 months of coverage
The calculator's defaults. $4,000 is already saved and the deadline is twelve months out.
| Monthly essential expensesthe floor, not the usual spend | $3,500.00 |
| Coverage targetthe dropdown's "standard" | 6 months |
| Target fund$3,500 × 6 | $21,000.00 |
| Current savings19.05% funded | $4,000.00 |
| Gap$21,000 − $4,000 | $17,000.00 |
| Monthly to fully fund$17,000 ÷ 12 | $1,416.67 |
$1,416.67 a month is a demanding number — it's more than a third of the $3,500 this household spends on essentials, sustained for a year. That's the honest reading, and it's why the deadline field matters more than it appears to. The gap is fixed at $17,000; the pain is entirely a function of how fast you insist on closing it.
Example: the same expenses at each coverage level
Hold expenses at $3,500 and savings at $4,000, keep the twelve-month deadline, and step the coverage dropdown through all four of its options.
| 3 months (lean)gap $6,500.00 — $541.67/mo | target $10,500.00 |
| 6 months (standard)gap $17,000.00 — $1,416.67/mo | target $21,000.00 |
| 9 months (cautious)gap $27,500.00 — $2,291.67/mo | target $31,500.00 |
| 12 months (conservative)gap $38,000.00 — $3,166.67/mo | target $42,000.00 |
The target scales in a straight line but the monthly figure scales worse than it looks, because the $4,000 you already have is a bigger share of a small target than of a large one. It covers 38% of the lean target and under 10% of the conservative one. The lean fund is 25% of the conservative fund's size but needs only 17% of its monthly contribution — which is the arithmetic argument for why guidance so often says to bank three months first and extend later, rather than aiming at twelve from a standing start.
Frequently asked questions
How much should I have in my emergency fund?
Three to six months of essential expenses is where the published guidance clusters — Fidelity and Vanguard both use that range, and this calculator's dropdown labels 6 months "standard" for the same reason. On $3,500 of monthly essentials that's $10,500 to $21,000.
The CFPB's guide is notably more reluctant to name a number, building its guidance around your own recurring costs and the observation that a small fund is transformative compared to none. That reluctance is doing real work: the range widens for anyone whose income is variable or seasonal, who's self-employed, who supports dependents on one income, or who works in a field where finding the next job takes months rather than weeks. The number the rule of thumb can't see is how long your income would take to come back.
Where should I keep my emergency fund?
The constraint that decides it is that you need the money on the day you need it, and you don't get to choose the day. That rules out anything with a penalty, a settlement period or a price that can be down when you ask. The CFPB's guidance points to insured deposit accounts you can reach without penalty, and the accounts that fit are a savings account, a high-yield savings account, or a money market account — all FDIC- or NCUA-insured to $250,000 per depositor, per institution, per ownership category.
The published guidance is also consistent about what doesn't fit: Bankrate and Fidelity both flag CDs and stock-market investments as poor homes for emergency money, for opposite reasons — one has a penalty for early access, the other has a price that tends to be lowest exactly when layoffs are highest. Project the balance in a high-yield savings calculator or a money market calculator to see what the cushion earns while it waits.
Should I build an emergency fund or pay off debt first?
The published guidance mostly refuses the either/or, for a mechanical reason rather than a motivational one: without a cash cushion, the next unexpected expense goes onto the credit card, so an aggressive payoff plan with no fund tends to rebuild the balance it just paid down. Hence the common sequencing — a small starter fund, then high-interest debt, then the full three-to-six months.
It isn't unanimous. Sallie Krawcheck has argued publicly that building a full emergency fund ahead of paying off credit card debt is bad advice, on the arithmetic that a card at 20%+ costs far more than a savings account at 4% earns. Both positions are defensible, and they disagree about size rather than order: nobody argues for a twelve-month fund ahead of a 24% card. Model the payoff side with the debt payoff calculator.
What counts as an essential expense for an emergency fund?
The test is what still arrives when the paycheck doesn't. Housing, utilities, groceries, insurance premiums, transport to work, childcare, prescriptions, and the minimum payments on your debts — the minimums, not the accelerated payoff, because that's what keeps you current in a bad month.
What doesn't belong is anything you'd cancel in week one: streaming, dining out, travel, the gym, discretionary shopping. Using your actual monthly spending as the input is the most common way to oversize the target here, because it silently buys you months of a lifestyle you wouldn't be living. On the defaults, the difference between entering $3,500 of essentials and $4,500 of total spending is a $6,000 swing in the six-month target — and about $500 a month on the contribution.
Is 3 months or 6 months of expenses enough?
Both appear in the guidance, and the split is really about how quickly your income could be replaced. Three months is conventionally described as fitting a dual-income household with stable, in-demand work; six or more for a single earner, variable or commission income, self-employment, or a specialised role where the search runs long. The dropdown's labels — lean, standard, cautious, conservative — compress that same spectrum.
The number is a bet on the length of the gap, and you hold the information that sets it. A household with no credit available and no family backstop is making a different bet at three months than one with both. What the arithmetic can tell you is the price of the caution: on the defaults, moving from 3 months to 6 costs $875 a month more over a one-year build.
What this emergency fund calculator doesn't model
It's a target and a division. That's enough for the question it answers and leaves several real things out.
- It ignores interest entirely — The monthly figure is the gap divided by months, with no credit for what the balance earns while you build it. On the defaults, saving $1,416.67 a month into a 4.5% account alongside the existing $4,000 actually reaches $21,538.85 in twelve months, not $21,000 — you'd only need $1,372.68 a month to land on target. So the tool asks for about $44 a month more than the arithmetic requires. That's conservative by design, and the direction of the error is toward having more than you planned.
- Expenses are frozen — One figure, held flat for the whole build and the whole emergency. Rent rises, insurance renews, and the target you're saving toward today is sized for costs you had when you typed them in. A fund built over 48 months against year-one expenses is meaningfully short by the time it's finished.
- It assumes the emergency is only a lost income — Coverage months model a gap in earnings. Plenty of emergencies are a bill instead — a car transmission, an ER visit, a deductible — and those don't scale with your monthly expenses at all. A $6,000 repair is the same $6,000 whether your essentials are $2,000 a month or $8,000.
- No tax, no unemployment insurance, no severance — The model assumes income goes to zero and stays there. In practice unemployment benefits, severance or a partner's income can cover part of the gap — which is the strongest argument that a fund sized at six months of full expenses is often more than six months of actual runway.
- Nothing here weighs the fund against its alternatives — Money in an emergency fund is money not paying down a credit card and not invested. The tool prices the fund; it can't price what the fund costs you. At 4.5% in savings against a 22% card, that spread is around 17 points a year on every dollar held — which is the entire substance of the debt-versus-savings debate in the FAQ above.
- ·Standard compound-interest / APY formulas
- ·FDIC / NCUA deposit insurance — Insured up to $250,000 per depositor, per institution
Rates, brackets and limits here are checked against primary sources. If a number still looks off, email support@realmoneyiq.com and we'll review and fix it.
RealMoneyIQ provides free educational calculators, not financial, tax, investment or legal advice. Results are estimates based on the assumptions you enter and publicly published rates; your actual outcome will differ. Always confirm decisions with a licensed professional who knows your full situation.