Interactive financial calculator
Emergency Fund Calculator
Estimate an emergency savings target from essential expenses and chosen coverage, then model progress with contributions and optional APY.
- Free to use
- No account required
- Inputs stay in your browser
Methodology & Assumptions
How this estimate is calculated
Formula: target fund = essential monthly expenses × target coverage months. When APY is above zero, it is converted to an effective monthly rate. Interest is applied first and the planned contribution is added at month-end, capped in the final month at the amount needed to reach the target. The simulation stops at the target or 100 years.
Illustrative result: figures are rounded for display after calculations use full numeric precision. Actual results may differ.
Currency: dollar symbols are a display convention. Enter every monetary amount in one consistent currency; the calculator does not convert currencies or apply jurisdiction-specific tax rules.
How Much Emergency Savings Should You Target?
An emergency fund is a liquid reserve for unplanned essential costs or an interruption in income. Three to six months of essential expenses is a common planning range, but it is not correct for everyone. Income stability, number of earners, dependants, insurance coverage, health needs, housing, and access to other liquidity can support a shorter or longer target.
The core formula is target fund = essential monthly expenses × target coverage months. Current coverage equals current emergency savings divided by essential monthly expenses. A positive difference is a shortfall; a negative difference is a surplus above the selected target.
Time-to-Target Method
When APY is zero, the timeline is the funding gap divided into monthly contributions, with the last contribution capped at the remaining gap. When APY is above zero, it is converted to an effective monthly rate. Interest is applied first and the contribution is added at month-end. The model stops at the target or after a 100-year technical horizon.
APY is optional because the main purpose of an emergency fund is accessible liquidity, not maximizing projected return. Account protection, access rules, fees, tax treatment, and rates differ by institution and country.
Worked Example: Six Months of Expenses
At $3,000 of essential monthly expenses, a six-month target is $18,000. With $6,000 already saved, the gap is $12,000 and current coverage is two months. A $500 monthly contribution with 0% APY reaches the target in 24 months, with $12,000 of planned contributions and no modeled interest.
Choosing Essential Expenses
Focus on costs that would continue during an emergency: housing, basic food, utilities, insurance, essential transport, medicine, childcare, and minimum debt payments. Exclude optional travel, entertainment, and discretionary purchases unless you intentionally want a larger buffer. Revisit the amount when rent, mortgage payments, household size, insurance, or income stability changes.
Use the Savings Goal Calculator for other cash targets, the Savings Rate Calculator to review cash flow, or the Net Worth Calculator to include the fund in a broader snapshot.
Frequently Asked Questions
Is a three-month or six-month emergency fund better?
Neither is universally better. A stable two-income household with strong insurance may choose less coverage than a single-income household, freelancer, or person with variable earnings. Use the month selector to compare targets.
What if I have already funded the target?
The calculator shows the surplus and reports that the selected target is already funded. Consider whether the target still fits your circumstances before redirecting future contributions.
What happens with zero monthly contributions?
If current savings are below target and there is no contribution or usable growth, the target is not reachable under those assumptions. A positive balance with positive APY may eventually grow to the target, subject to the modeled horizon.
Should investments count as emergency savings?
Emergency reserves are generally intended to be accessible and relatively stable. Volatile investments can fall when cash is needed. Decide what is genuinely liquid after considering settlement, taxes, penalties, and market risk.