Find how large an emergency fund you need and how long to build it.
Please do not make financial decisions based on these results.
What is the Emergency Fund Calculator?
Find how large an emergency fund you need and how long to build it. To use the Emergency Fund Calculator, enter monthly essential expenses, months to cover, saved so far, monthly contribution; it returns target fund, still to save, months to reach target, and shows them instantly as you type.
Where the Emergency Fund Calculator fits
Find how large an emergency fund you need and how long to build it. The main figure it returns is the Target fund, worked out from the values you enter.
It belongs with the other budget & planning tools. If you are comparing options or checking a result from another angle, try the Cost of Living Adjuster, Millionaire Calculator or the Long Term Care Calculator.
How to use the Emergency Fund Calculator
- Fill in the fields. You will need Monthly essential expenses ($), Months to cover, Saved so far ($), Monthly contribution ($). Start with your real monthly figures, even if they are rounded. Fields marked optional can stay at zero.
- Read the result. The highlighted box gives the Target fund, and the cards below show Still to save, Months to reach target. Tables and charts break it down further.
- Test other scenarios. Results update as you type. Change one value at a time to see what drives the answer, and press Reset to go back to the defaults.
Formula and how it works
Example with real numbers
Here is the Emergency Fund Calculator using the default values shown in the calculator above:
Inputs
| Monthly essential expenses ($) | 3,200 |
|---|---|
| Months to cover | 6 |
| Saved so far ($) | 4,500 |
| Monthly contribution ($) | 400 |
Results
| Target fund | $19,200.00 |
|---|---|
| Still to save | $14,700.00 |
| Months to reach target | 36.8 |
With these inputs the calculator returns Target fund: $19,200.00. Change any value in the calculator to see how the result moves.
What if you change one input?
Sensitivity check: raising Monthly essential expenses ($) from 3,200 to 3,840 (about 20% higher) and leaving everything else as in the example above changes the results like this:
| Result | Example | After the change | Change |
|---|---|---|---|
| Target fund | $19,200.00 | $23,040.00 | +20% |
| Still to save | $14,700.00 | $18,540.00 | +26.1% |
| Months to reach target | 36.8 | 46.4 | +26.1% |
The input that moves the result most is the one to check twice. Change it in the calculator above to test your own case.
What the results tell you
The results panel of the Emergency Fund Calculator reports Target fund, still to save and months to reach target. Compare these figures while changing one input at a time, and use the related calculators below to look at the same situation from another angle.
Method and limits. This calculator applies the formula in the section above to your inputs, in your browser; nothing you enter is stored on our servers. Results are only as good as the figures you enter; use real recent numbers. It is for information, not financial, tax or legal advice.
Frequently asked questions
How many months should an emergency fund cover?
Three to six months of essential expenses; more if your income is irregular.
Do my numbers leave my device?
No. Everything is calculated in your browser and nothing is stored on our servers.
Can I switch between monthly and yearly?
Yes. Amount fields on this calculator can be switched between a per-month and a per-year figure, so enter whichever you know.
Are the results guaranteed?
No. Results depend entirely on the numbers you enter and the formulas shown on this page. Please do not make financial decisions based on them alone; confirm important figures with a licensed professional.
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