Emergency Fund Calculator
Set a months-of-expenses target, see your funding progress and get a date you will reach it, with guidance on how many months actually suits your situation.
Cover essential expenses only — rent or mortgage, food, utilities, insurance, minimum debt payments — not your full lifestyle. Three months suits stable dual incomes; six is the common target; nine to twelve fits variable income or a single earner. Keep it somewhere liquid: a high-yield savings account, not stocks.
Months of expenses is not months of income
"6 months of expenses" and "6 months of salary" are different numbers, and the gap is exactly your savings rate. On $6,000 a month:
| Saving | You spend | 6 months costs | Which is this much income |
|---|---|---|---|
| 0% | $6,000 | $36,000 | 6.0 months |
| 10% | $5,400 | $32,400 | 5.4 months |
| 20% | $4,800 | $28,800 | 4.8 months |
| 30% | $4,200 | $25,200 | 4.2 months |
| 50% | $3,000 | $18,000 | 3.0 months |
A 50% saver needs half the fund a non-saver needs, out of the same income, because the target is set by what you spend and they spend half as much. Only somebody saving nothing needs 6 months of income — for everyone else the salary-based figure overstates the target, and the more you save the more it overstates.
And the same rate builds it faster
The benefit lands twice, which is what makes the effect so lopsided. A higher savings rate shrinks the target and enlarges the monthly contribution:
| Saving | Target | Months to build it |
|---|---|---|
| 10% | $32,400 | 54 |
| 20% | $28,800 | 24 |
| 30% | $25,200 | 14 |
| 50% | $18,000 | 6 |
Tripling the savings rate from 10% to 30% does not cut the build time by two thirds. It cuts it by 74%, because the finish line moved towards you while you were running at it.
The build time does not depend on your income at all — it is 6(1 − s)/s months, where s is the savings rate. At s = 0.5 the two terms cancel and it comes to exactly the 6 months you are saving for, which is a pleasing coincidence rather than a deep fact.
Where the leverage actually is
At a 0% savings rate the fund is never built — the formula goes to infinity, which is the correct answer rather than a failure. At 100% there is nothing to cover, so the target is zero.
Between those the curve is steep at the low end and flat at the high end. Moving from 5% to 10% saves 60 months; moving from 45% to 50% saves 1.3. The same five points of savings rate is worth 45 times as much at the bottom.
Which is the practical reading. If the fund feels impossibly far away, that is because you are at the steep end of the curve — and it means a small change in spending has an unreasonably large effect on the answer. The lever with force in it is the denominator, not the numerator.
How to use
- Enter your essential monthly expenses.
- Choose how many months of cover you want.
- Enter your current savings and monthly contribution.
- Read the target and the date you will reach it.
Frequently asked questions
How many months should I hold?
Three to six months of essential expenses is the usual guidance, but the right figure depends on how quickly you could replace your income. A single earner in a specialised field, someone self-employed, or a household with one income supporting several people has a stronger case for more; two stable incomes in an in-demand field, less.
Should I count all my expenses or only essentials?
Essentials — housing, food, utilities, transport, insurance, minimum debt payments. The fund is there to cover a period when discretionary spending would stop anyway, so including it inflates the target and makes the goal feel unreachable.
Where should the money be kept?
Somewhere accessible within a day or two and not exposed to market movement. The point is availability at short notice, which rules out anything that might be down 20 per cent precisely when you need it. Interest is a secondary consideration to access.
Should I build the fund before paying off debt?
A common approach is a small starter fund first — enough to absorb a modest emergency — then aggressive debt repayment, then the full fund. Without any buffer, the next unexpected expense goes straight back onto the card you are trying to clear.
Does this count as an investment?
No, and treating it as one defeats its purpose. An emergency fund will lose value to inflation, and that erosion is the price of certainty. Money you might need next week has a different job from money you are growing for decades.
What actually counts as an emergency?
Loss of income, an urgent medical cost, an essential repair — things that are unexpected, necessary and urgent. A predictable annual expense is a budgeting matter rather than an emergency, and drawing on the fund for those is how it quietly disappears.
🔒 This tool runs entirely in your browser. Nothing you enter is uploaded, logged, or stored.