№ 050 · Savings cluster
Emergency Fund Calculator
An emergency fund is the difference between a setback and a crisis. This calculator sizes yours from your essential expenses and the months of coverage you want, then shows exactly how long it takes to get there — and the moment you cross each rung of safety along the way.
3/6/9 rule · months to build
Put a deadline on it with the Savings Goal Calculator, see where the fund fits in your Net Worth, or plan the high-interest debt to clear alongside it with the Credit Card Payoff Calculator.
What you need01
$
Where you stand02
$
$
%
Fully funded in 2 yr 11 mo
$24,000.00
your target fund · 6 months of $4,000.00
21% funded1.3 months covered now
Fund target$24,000.00
Covered now1.3 mo
% funded21%
Months to fund35 mo
- Balance$24,146.65
- Contributed$22,500.00
- Fund target$24,000.00
| Month 0 | balance $5,000.00, contributed $5,000.00 |
|---|---|
| Month 1 | balance $5,516.67, contributed $5,500.00 |
| Month 2 | balance $6,035.06, contributed $6,000.00 |
| Month 3 | balance $6,555.17, contributed $6,500.00 |
| Month 4 | balance $7,077.02, contributed $7,000.00 |
| Month 5 | balance $7,600.61, contributed $7,500.00 |
| Month 6 | balance $8,125.95, contributed $8,000.00 |
| Month 7 | balance $8,653.03, contributed $8,500.00 |
| Month 8 | balance $9,181.88, contributed $9,000.00 |
| Month 9 | balance $9,712.48, contributed $9,500.00 |
| Month 10 | balance $10,244.86, contributed $10,000.00 |
| Month 11 | balance $10,779.01, contributed $10,500.00 |
| Month 12 | balance $11,314.94, contributed $11,000.00 |
| Month 13 | balance $11,852.66, contributed $11,500.00 |
| Month 14 | balance $12,392.16, contributed $12,000.00 |
| Month 15 | balance $12,933.47, contributed $12,500.00 |
| Month 16 | balance $13,476.58, contributed $13,000.00 |
| Month 17 | balance $14,021.51, contributed $13,500.00 |
| Month 18 | balance $14,568.24, contributed $14,000.00 |
| Month 19 | balance $15,116.80, contributed $14,500.00 |
| Month 20 | balance $15,667.19, contributed $15,000.00 |
| Month 21 | balance $16,219.42, contributed $15,500.00 |
| Month 22 | balance $16,773.48, contributed $16,000.00 |
| Month 23 | balance $17,329.39, contributed $16,500.00 |
| Month 24 | balance $17,887.16, contributed $17,000.00 |
| Month 25 | balance $18,446.78, contributed $17,500.00 |
| Month 26 | balance $19,008.27, contributed $18,000.00 |
| Month 27 | balance $19,571.63, contributed $18,500.00 |
| Month 28 | balance $20,136.87, contributed $19,000.00 |
| Month 29 | balance $20,703.99, contributed $19,500.00 |
| Month 30 | balance $21,273.01, contributed $20,000.00 |
| Month 31 | balance $21,843.92, contributed $20,500.00 |
| Month 32 | balance $22,416.73, contributed $21,000.00 |
| Month 33 | balance $22,991.45, contributed $21,500.00 |
| Month 34 | balance $23,568.09, contributed $22,000.00 |
| Month 35 | balance $24,146.65, contributed $22,500.00 |
Coverage milestones
| Coverage | Fund size | Reached |
|---|---|---|
| 1 month | $4,000.00 | Now |
| 2 months | $8,000.00 | Month 6 |
| 3 months | $12,000.00 | Month 14 |
| 4 months | $16,000.00 | Month 21 |
| 5 months | $20,000.00 | Month 28 |
| 6 months | $24,000.00 | Month 35 |
How it works · methodology
The math, in the open.
target = essential monthly expenses × months of coverage balance(m) = balance(m−1) × (1 + APY/12) + monthly contribution months to fund = first month m where balance(m) ≥ target milestone(k) = first month the balance covers k months of expenses
- expenses
- Essential monthly spending the fund must cover
- months
- Months of coverage (the 3/6/9 rule)
- APY
- Annual yield on the savings account (optional)
- m
- Months from now
Assumptions & limits
- The target is essential monthly expenses times your chosen months of coverage — base it on needs, not full lifestyle spending.
- Contributions are added at the end of each month and any APY compounds monthly; expenses are held flat in today’s dollars.
- An emergency fund belongs in a safe, liquid account (e.g. an FDIC-insured high-yield savings account), never invested at market risk.
- Estimates only — the right size and the right number of months are personal and change with your circumstances.
By the MintNumber Editorial Team·Reviewed
Frequently asked
Questions about emergency funds
How big should my emergency fund be?
The common rule is three to six months of essential expenses, stretched toward nine or twelve if your income is variable, you are self-employed, or you are a single earner supporting others. The key word is essential — base the target on what it actually costs to keep the lights on, not your full lifestyle spending. This calculator multiplies your essential monthly expenses by the months of coverage you choose to get the target.
What counts as an essential expense?
The things you could not stop paying if your income vanished: rent or mortgage, utilities, groceries, insurance premiums, transportation to work, and the minimum payments on your debts. Leave out the discretionary spending you could pause in a real emergency — dining out, travel, subscriptions, and savings contributions. A leaner, honest essentials number gives you a fund that is both adequate and achievable.
Where should I keep an emergency fund?
Somewhere safe, separate, and liquid — typically a high-yield savings account at an FDIC-insured bank, kept apart from your checking so you are not tempted to spend it. It should earn interest but never be exposed to market risk; an emergency fund is insurance, not an investment. Enter your account’s APY and the calculator folds that yield into how fast the fund builds.
Should I build an emergency fund or pay off debt first?
A widely used approach is to save a small starter cushion of around one month of expenses first, then throw everything at high-interest debt like credit cards, and finally come back to top the fund up to a full three-to-six months. A starter buffer keeps a surprise expense from going straight onto a card and undoing your progress. Use this calculator for the target and our debt payoff tools to plan the middle step.
How does the calculator work out the time to build?
It starts from what you have saved and adds your monthly contribution each month, compounding any savings APY you enter, until the balance reaches the target. The milestone table shows when you cross each rung of coverage — one month of expenses, two, and so on — so progress feels concrete. Figures are estimates in today’s dollars; expenses and the right number of months are personal, so revisit them as your life changes.