Emergency Fund & Savings Buffer Calculator
Find out how many months of expenses your savings cover and how long it takes to reach a full buffer.
Last reviewed by the myCalculator Editorial Team
Input Parameters
Rent or mortgage, groceries, utilities, insurance, transport and minimum debt repayments.
Calculation Results
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Formula & How Emergency Fund & Savings Buffer Calculator Works
An emergency fund should cover your essential expenses, not total spending, because you would cut discretionary spending if your income stopped. With $15,000 saved and $3,500 of essential monthly expenses, you have 15,000 ÷ 3,500 = 4.3 months of runway. A six-month target is 6 × 3,500 = $21,000, so the shortfall is $6,000. Three to six months is a common rule, with more for a single income, a variable income or self-employment. Keep the money somewhere you can reach it quickly, such as a high-interest savings account or an offset account. Rebuild the fund after you use it, and review the target when your expenses change.
- Enter Current Savings ($) ($): Input your target parameter value.
- Enter Monthly Essential Expenses ($) ($/mo): Input your target parameter value.
- Enter Monthly Discretionary Spending ($) ($/mo): Input your target parameter value.
- Enter Target Buffer (Months) (months): Input your target parameter value.
- Apply Formula: Calculate using
Runway (months) = Savings / Essential Expenses | Shortfall = (Target × Essentials) - Savings. - Review Results: View exact computed answers, metrics, and worked mathematical proofs.
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Frequently Asked Questions (FAQs)
How big should an emergency fund be in Australia?
Three months of essential expenses is a common minimum for stable dual-income households. Single-income households, contractors and sole traders generally target six to twelve months.
Should an emergency fund sit in an offset account?
If you hold a mortgage, an offset account saves interest at your home loan rate while keeping the money accessible, which usually beats a savings account after tax.
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Authoritative Standards & Verified Reference Citations
Calculations and mathematical logic on this page are grounded in published statutory rules, regulatory standards, and official government data published by the following bodies:
Consumer guidance on mortgage borrowing capacity, compound interest formulas, and loan fees.
Official cash rate target announcements, monetary policy statements, and national economic statistical data.
Official U.S. Federal Funds Rate and comprehensive macroeconomic time-series data.
Key Eurozone interest rates, deposit facility rates, and monetary policy operations.
Residential mortgage serviceability buffer framework (3.0% stress test hurdle rate).
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