Example 1
- Savings: 15,000
- Expenses: 5,000
3 months
Exactly three months of living costs - a common lower bound in personal-finance guidance.
Emergency fund calculator
The emergency fund calculator divides savings by monthly expenses and says how many months the cushion lasts. 15000 at 5000 of expenses is exactly 3 months. With a 6-month goal, 4000 of expenses, and 12000 saved, you are 12000 short.
Months = savings ÷ expenses. 15000 ÷ 5000 = 3. The month's balance lives on household budget.
Result
Enter your numbers and hit Calculate - the result shows up right away.
How results are calculated
An emergency fund on this page is a liquid cushion divided by monthly living costs. Months = savings ÷ expenses. If you type a goal T, need = T × expenses, the gap is what is missing, and the surplus is what sits above the goal. There is no inflation and no interest. We count current cover, not cushion growth.
15000 and 5000 of expenses give exactly 3 months. 30000 at 4500 is about 6.67 months, a little over half a year. At 12000, 4000 of expenses, and a 6-month goal you have 3 months and a 12000 gap, because 6 × 4000 = 24000.
Type Savings and Monthly expenses. Target months sit under the extra field and are optional. Click Calculate and read months of cover plus, when a goal is on, the gap or surplus.
Household budget shows whether that same month even has a surplus: 7500 and 5800 leave 1700. Interest on the cushion can be sketched on savings interest. This calculator does not compound 3% onto 15000.
Three months is a common lower bound in guides, not a rule. Budget-month expenses can sit below a real job-loss shock. A 12000 gap is not an installment; it is the difference between a goal and a balance.
Type 15000 and 5000. Check 3 months. Then try 12000, 4000, and a goal of 6 to see the 12000 shortfall.
How to use the calculator
- In Savings, type the liquid cushion, for example 15000.
- In Monthly expenses, type living costs, for example 5000. That is the months denominator.
- Target months are optional. At 6, expenses 4000, and savings 12000 the result is a 12000 gap.
- Click Calculate. At 15000 and 5000 you should see 3 months. At 30000 and 4500 about 6.67.
- The same month's income minus expenses lives on the household-budget page.
Months of cushion: savings divided by expenses
Months = savings ÷ expenses. 15000 at 5000 is exactly 3 months. With a 6-month goal and 4000 of expenses, 12000 saved is 12000 short.
- Savings
- The numerator of months. 15000 / 5000 = 3. 30000 / 4500 ≈ 6.67 months.
- expenses
- The denominator, Monthly expenses. 4000 with a goal of 6 needs a 24000 cushion; 12000 leaves a 12000 gap.
- months
- The result savings ÷ expenses. 3 at 15000 and 5000. Target months only scores the gap; it does not compound inflation.
Usage examples
Example 2
- Savings: 30,000
- Expenses: 4,500
6.67 months
Coverage is not always a whole number. 6.67 means a bit more than half a year at current spend.
Example 3
- Savings: 12,000
- Expenses: 4,000
- Target: 6
3 months
Gap 12,000 to target
You have half the target buffer. Reaching 6 × 4,000 = 24,000 requires another 12,000.
Related calculators
FAQ
How many months does 15000 last at 5000 of expenses?
3 months. 15000 ÷ 5000 = 3. That is a cover sketch, not a bank product.
What about 30000 and 4500?
About 6.67 months. 30000 ÷ 4500 = 6.666…, so the calculator keeps the fraction.
How much is missing for 6 months at 12000 saved and 4000 expenses?
12000. Need is 6 × 4000 = 24000, you have 12000, gap 12000. Cover is 3 months.
Is a goal required?
No. Without a goal you get months alone. A goal adds a gap or a surplus.
Are 3 months mandatory?
No. That is a division result and a common guide threshold. The calculator does not order 6.
How is this different from household budget?
Budget subtracts expenses from income in one month. The calculator divides a stash by expenses.
Does interest grow during those 3 months?
No. There is no inflation and no interest. 15000 stays 15000 in the numerator.
What should I count as savings?
What you can spend without selling a home. The calculator does not ask whether the amount sits in overnight cash.
What if expenses are 0?
Division has no meaning. The calculator waits for positive expenses.
Should I read 6.67 as 7 months?
The calculator shows a fraction. 6.67 is more than half a year at the current 4500, not a rounded calendar.
Knowledge sources
Months of cushion are savings divided by expenses. Any target is the one you type, not an official rule.
Page updated in 2026.