Emergency Fund Calculator
See how long it'll take to build a fully funded emergency fund at your savings rate.
Estimates only, not financial, tax, or legal advice. See our Terms and Privacy Policy.
An emergency fund is money set aside specifically to cover essential expenses if income stops or a large unplanned cost hits, kept liquid and safe rather than invested for growth. This calculator simulates building one from your current savings plus a monthly contribution, growing at a conservative assumed return, until it reaches a target based on how many months of expenses you want covered.
Once you know your target, this site's Budget Calculator can help find room in your monthly spending for the contribution, and the Net Worth Calculator shows how the fund fits into your broader finances.
How does this calculator work?
Enter your essential monthly expenses (rent or mortgage, utilities, groceries, insurance, minimum debt payments, the costs that don't stop if income does) and how many months of coverage you're targeting, commonly 3 to 6 months.
The calculator multiplies those two numbers to get your target fund size: target = monthly expenses × months of coverage.
Enter your current savings already set aside for this purpose and how much you plan to contribute each month. The calculator then simulates the balance month by month, adding your contribution and a conservative assumed return (compounded monthly) to the previous month's balance, until the target is reached.
It reports how many months that takes, the total contributions and interest along the way, and shows the full schedule both monthly and by year.
Worked example
$3,000 in essential monthly expenses, targeting 6 months of coverage, starting from $2,000 in savings with a $500 monthly contribution at a 4% assumed annual return.
- Target fund size
- $18,000
- Funded so far
- 11.1%
- Months to reach target
- 31 months
How the numbers work
The target is $3,000 × 6 = $18,000. Starting from $2,000, that's 11.1% already funded.
Adding $500 a month, plus interest on the growing balance at a 4% annual rate (compounded monthly), reaches the full $18,000 target in 31 months, a little over two and a half years.
Interest plays a small role here on purpose, an emergency fund should stay in something safe and liquid like a high-yield savings account, not chase higher returns that come with more risk or less accessibility. The real lever for reaching the goal faster is the monthly contribution, not the assumed rate.
Emergency Fund Calculator glossary
- Essential Expenses
- The costs that don't stop in an emergency: housing, utilities, food, insurance, and minimum debt payments, as opposed to discretionary spending that could be cut temporarily.
- Months of Coverage
- How many months of essential expenses the target fund is sized to cover, commonly 3-6 months, sometimes more for single-income households or irregular income.
- Funded Percentage
- Current savings divided by the target fund size, showing progress toward a fully funded emergency fund.
Emergency Fund Calculator FAQs
How many months of expenses should I actually target?+
A common range is 3-6 months for dual-income, stable-employment households, and 6-12 months for single-income households, self-employed income, or otherwise less predictable cash flow. There's no universally correct number, it's a trade-off between having a bigger cushion and not leaving too much cash earning a low return.
Ally Bank's emergency fund guideWhy does the calculator use such a conservative return rate?+
An emergency fund needs to be accessible without penalty or delay and without risk of loss right when you need it, which rules out most higher-return investments. A high-yield savings account or money market account is the typical home for this money, hence the conservative default rate.
What if I already have more saved than my target?+
The calculator shows 100% funded and a 0-month timeline in that case. Extra savings beyond the target are usually better directed toward other goals (debt payoff, retirement, or general investing) rather than sitting in a low-yield account indefinitely.
Should retirement accounts count toward this target?+
Generally no. Retirement accounts often carry withdrawal penalties or tax consequences for early access, which defeats the purpose of an emergency fund needing to be immediately available without cost.