CostWise
    Emergency fund · home · wedding · sinking funds

    How Much Emergency Savings Do You Need?

    Find out how much you should set aside for emergencies, then see how much to save each month and how long it could take to reach your target.

    Step 1 — What are you saving for?

    Step 2 — Which question do you want answered?

    Step 3 — Your target and where you stand

    $

    Housing, utilities, food, insurance, minimum debt payments, transport.

    months

    Your choice — this tool does not prescribe a number.

    $
    $

    Your emergency fund plan

    Save per month
    $658.33
    to reach $18,000 by October 2028
    Target
    $18,000
    6 × $3,000 essentials
    Still needed
    $17,000
    $1,200 of it covered by planned lump sums
    Progress
    6%
    0.3 months of essentials covered today
    Required
    $658.33/mo
    You planned
    $300.00/mo
    Monthly gap
    $358.33 short

    At $300 a month you reach the target in March 2031 instead — $8,600 short by your chosen date. Either raise the contribution to $658.33, move the date, or add a planned lump sum below.

    Planned one-time contributions

    A bonus, tax refund, gift or asset sale you expect to add. These are amounts you have entered, not forecasts — a lump sum only helps a deadline if it lands on or before that date.

    $

    $1,200 planned in total — all of it lands on or before your target date.

    Milestones on the way

    Projected from your contribution of $300 a month, including the lump sums above.

    Projected dates at which each quarter of the goal is reached
    MilestoneBalanceProjected
    25% funded$4,500June 2027
    50% funded$9,000September 2028
    75% funded$13,500December 2029
    100% funded$18,000March 2031

    What if you changed one thing?

    Each row changes a single element of your plan and leaves everything else alone.

    Completion date under alternative saving scenarios
    ScenarioChangeGoal reachedvs now
    Your current plan$300/moMarch 2031—
    Save 10% more$330/moOctober 2030−5 mo
    Save 25% more$375/moMay 2030−10 mo
    One extra $1,200 next monthsingle paymentNovember 2030−4 mo
    Keep your deadline$658/mo neededOctober 2028−29 mo

    What the date costs you per month

    The same $18,000 target, solved for different deadlines. Lump sums are only counted when they arrive before the date in question, which is why some rows move more than the months alone suggest.

    Required monthly saving at different target dates
    Target dateMonthsRequired monthly
    April 2028 18$877.78
    July 2028 21$752.38
    October 2028 · your date24$658.33
    January 2029 27$585.19
    April 2029 30$526.67
    October 2029 36$438.89

    What your numbers say

    You are 6% of the way to $18,000, with $17,000 still to find. $1,200 of that is expected to come from the one-time contributions you entered, leaving $15,800 to be covered by monthly saving.

    Your date needs $658.33 a month, which is $358.33 more than the $300 you planned. Holding the contribution steady moves completion to March 2031; closing the gap keeps the original date.

    The $1,200 of planned one-time money is doing real work here: without it, the same $300 a month would take until July 2031. Treat those amounts as planned, not guaranteed — if one does not arrive, the date moves back.

    Right now $1,000 covers about 0.3 months of your $3,000 essential spending — that is the honest measure of today's exposure, separate from whatever longer target you have set. Public financial-education material commonly references three to six months as a general range; it is context, not a recommendation for your situation.

    Three plans, three very different answers

    Emergency fund from zero

    $2,800 essentials, 3 months of coverage, nothing saved. Target $8,400. At $350 a month it takes 24 months; a $1,500 tax refund in month 5 pulls completion forward to month 20.

    Down payment with a fixed date

    $400,000 home, 10% down, $15,000 saved, 36 months away. Remaining $25,000, so the deadline demands $694 a month. Stretch to 48 months and it drops to $521 — the same goal, $173 a month cheaper.

    Four sinking funds at once

    Car repairs, insurance, travel and gifts each look small. Their required contributions add to $470 a month — the number that matters, and the one people miss when each fund is planned on its own page.

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    Content last updated: September 17, 2026

    How this calculator works, assumptions, and sources

    How this calculator works
    Formula

    Emergency-fund target = essential monthly expenses × months of coverage. Down-payment target = home price × down-payment % (or an entered dollar target). Remaining = max(0, target − current savings − qualifying one-time contributions). Deadline-first required monthly = remaining ÷ whole months until the target date (0 months means the full amount is due now). Contribution-first projection: balance(k) = balance(k−1) × (1 + r) + monthly contribution + any lump sums dated month k, where r = optional APY ÷ 12 and defaults to 0; the completion month is the first k where balance ≥ target. Milestones are the first months the same projection reaches 25%, 50%, 75% and 100% of target. Per sinking-fund goal: remaining, months left and required monthly are calculated independently, then summed.

    Assumptions
    • Essential expenses mean non-discretionary costs only — housing, utilities, food, insurance, minimum debt payments and transportation.
    • Contributions are made once per calendar month at the amount entered and are never skipped.
    • One-time contributions are counted once, in the month entered, and only reduce a deadline's required monthly amount when they arrive on or before that date.
    • Interest is excluded by default; the optional APY applies one twelfth of the rate to the balance each month in the projection only, never to the required-monthly figure.
    • Target dates are handled as whole calendar months; a date in the current month or the past is treated as due now.
    Default values & where they come from
    • Emergency fund: $3,000 essential expenses, 6 months of coverage, $1,000 saved, $300/month, target 24 months out.
    • Down payment preset: $400,000 home price at 20%. Wedding and custom presets: $35,000 target.
    • Example sinking funds: car repairs $1,200, annual insurance $900, travel $2,500 — all editable examples, not fixed categories.
    • Federal Reserve SHED reports roughly a third of adults could not cover a $400 emergency with cash; CFPB Making Ends Meet finds ~24% of households have no emergency savings. Both are context only.
    Limitations
    • Does not recommend how many months of coverage you need, or adjust for job stability, dependants or health risks.
    • Does not model irregular income, seasonal expenses, or costs that rise during a long savings window.
    • Planned one-time contributions are treated as entered, not as forecasts — an unpaid bonus changes the result.
    • The optional APY is a flat monthly credit on the balance and does not model compounding frequency, tax or rate changes.
    • Down-payment mode is a savings target only: it does not check loan-programme minimums or model mortgage insurance, closing costs or moving expenses.
    When not to rely on this calculator
    • Not a personalized financial plan, a household budget, or advice on how much you should save.
    • Not for investment or retirement goals where market returns dominate the outcome.
    • Not a mortgage calculator — it sizes a down payment, nothing about the loan itself.
    • Do not treat a projected completion month as guaranteed if your income or expenses vary.
    Sources

    Corrections welcome — see our corrections policy and editorial policy.

    Savings goal questions

    How big should an emergency fund be?
    This calculator does not pick a number for you: it multiplies the essential monthly expenses you enter by the months of coverage you choose. Three to six months is the range most commonly cited in public financial-education material, and the Federal Reserve's SHED survey is often quoted for context because roughly a third of adults report they could not cover a $400 emergency with cash. Whether three, six or twelve months is right for you depends on job stability, dependants and other resources — change the months input and compare the required monthly savings for each.
    What is the difference between the two planning modes?
    Deadline-first answers 'how much must I save each month to reach this by a given date' — it divides what is still needed by the months remaining. Contribution-first answers 'if I save this much a month, when do I finish' — it runs the balance forward month by month until it reaches the target. Both use the same remaining amount and the same lump sums, so they never contradict each other; they simply solve for different unknowns.
    How are one-time contributions handled?
    Each planned lump sum is added once, in the month you enter. In deadline-first mode a lump sum only reduces the required monthly amount if it lands on or before the deadline — money arriving after the date does not help you meet it. In contribution-first mode the lump lands at its month and can move the completion date forward sharply. These are amounts you tell the planner to expect, not forecasts: a bonus or refund that does not arrive changes the result.
    Can I plan several goals at the same time?
    Yes — choose Sinking funds. Each goal keeps its own target, current balance, date and contribution, and is calculated independently before anything is totalled. The planner then shows the combined monthly amount your goals demand, the combined remaining, the goal taking the biggest share of your monthly savings and the nearest deadline. That combined figure is usually the important one: individual goals often look affordable while their sum does not.
    Does the planner assume investment returns?
    No. By default it projects contributions only, so the arithmetic stays checkable. There is an optional advanced switch for a savings-account APY, which applies one twelfth of the rate to the balance each month in the contribution-first projection. Deliberately, the required-monthly figure in deadline-first mode ignores interest, so it is never optimistic. Cash-goal timelines of a year or two are dominated by contributions, not yield.
    What happens if my target date has already passed?
    A date in the past or in the current month is treated as due now: the planner shows the full remaining amount as needed immediately rather than dividing by zero months. Switch to contribution-first to get an achievable date at your current saving rate, which is usually the more useful answer once a deadline has slipped.
    Why does my required monthly amount differ from remaining ÷ months?
    Only because of lump sums. The required amount is (target − current savings − qualifying lump sums) ÷ months remaining. Without lump sums it is exactly remaining divided by months, rounded to the cent. Negative results are floored at zero: once the goal is covered, the required contribution is nothing, not a negative number.