Emergency Fund Calculator
$
6 mo
$
$
Target Emergency Fund$21,000.00
Remaining Shortfall$16,000.00
Months to Build27 mo
Months Currently Covered1.43 mo
The Emergency Fund Calculator sizes the cash cushion you should keep for job loss, medical bills, or unexpected repairs. You set your essential monthly expenses and how many months of coverage you want, and it returns your target fund, how much you still need to save, how many months of expenses your current savings already cover, and how long it will take to fully fund at your monthly savings rate.
Formula
target = expenses × months; shortfall = max(0, target − saved); monthsToBuild = ceil(shortfall / contribution)
- expenses
- Essential monthly spending
- months
- Months of coverage desired
- saved
- Current emergency savings
- contribution
- Amount saved toward the fund each month
How it works
- Enter your essential monthly expenses — rent or mortgage, food, utilities, insurance, and minimum debt payments.
- Choose how many months of coverage you want, then enter what you have saved so far and how much you can set aside each month.
- The target fund is monthly expenses times months of coverage; the shortfall is that target minus current savings; the time to build divides the shortfall by your monthly contribution, rounded up.
Worked example
Monthly expenses of $3,500, a 6-month target, $5,000 already saved, and $600 saved each month.
- Target = 3,500 × 6 = $21,000.
- Shortfall = 21,000 − 5,000 = $16,000.
- Months currently covered = 5,000 ÷ 3,500 ≈ 1.43.
- Months to build = ceil(16,000 ÷ 600) = 27 months.
A $21,000 target, $16,000 still needed, reached in about 27 months.
Frequently asked questions
- How many months of expenses should an emergency fund cover?
- A common guideline is three to six months of essential expenses. Six months or more is prudent if your income is variable, you are self-employed, or you are the sole earner; three months may suffice with very stable dual incomes.
- Should I base the fund on income or expenses?
- Use essential expenses, not income. An emergency fund needs to cover what you must spend to get by — housing, food, utilities, insurance, and minimum debt payments — not discretionary spending you can pause during a crisis.
- Where should I keep my emergency fund?
- Keep it liquid and safe, such as a high-yield savings account or money market account, so you can access it instantly without market risk. Avoid tying it up in stocks or anything with withdrawal penalties.
- Why does the time to build round up to a whole month?
- Because you contribute once per month, the final partial month still requires a full deposit to cross the target, so the calculator rounds the months-to-build up to the next whole month.