Everyday money
Emergency fund: Definition, Formula and Example
An emergency fund is money reserved for unexpected expenses or income disruption rather than routine planned spending.
Scope: General financial concept; examples are hypothetical.
Other names and related labels: Emergency savings; Cash reserve.
How it works
One planning method expresses a target as months of essential expenses. The appropriate buffer depends on income stability, dependents, insurance and other accessible resources. A selected number of months is an assumption, not a universal requirement.
Target reserve = essential monthly expenses × chosen coverage months; gap = max(0, target − existing reserve)
Define the expenses and eligible savings consistently. Borrowing capacity, volatile investments and restricted retirement funds are not automatically equivalent to accessible cash.
$2,500 essential expenses and six chosen months
Assume $5,000 is already set aside.
- Target: $2,500 × 6 = $15,000.
- Gap: $15,000 − $5,000 = $10,000.
- Current coverage: $5,000/$2,500 = two months.
The chosen target is $15,000, leaving a $10,000 gap and two months already covered.
Six months is a hypothetical target; no interest, inflation or change in expenses.
Try these example inputsAn emergency target is different from an investment return goal
An emergency can happen when markets are down or credit is unavailable. Keep accessibility and the risk of loss in view. A result showing zero gap means the chosen target is met, not that every possible emergency is covered.
Explore with a calculator
- Emergency Fund Calculator
Calculate a chosen target, current coverage or a savings plan.
- Savings Calculator
Project contributions under stated interest and timing assumptions.
Sources and checks
Definition and example arithmetic checked . Sources explain the concepts; numerical examples use the assumptions stated above.
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