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Emergency fund: how much to save and how long it takes

Enter your essential expenses and how many months you want covered. The calculator adjusts the target for inflation and shows how much to save each month, or how long it takes saving a fixed amount.

Educational simulation. Not investment advice. Results are estimates based on the data you enter and do not replace advice from a qualified professional.

Reviewed on Oct 31, 2026

Example: a household with $4,000 of essential monthly expenses that has $1,000 saved.

Your fund
Where to keep it

Keep the fund somewhere you can withdraw from any day without losses. The tax rate applies only to the interest.

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—Save each month
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The path to a full fund

Net balance month by month, how much came out of your pocket and the target adjusted for inflation.

Tap the chart to see the values.

Time frame × monthly amount

How much to save each month to finish the fund over different time frames, with the same expenses and return.

Tap the chart to see the values.

Month by month

Balances at the end of each month, with deposits at the start of the month.

Next step

Take this page’s results to another calculator with the fields already filled in.

Plan other goals on the same budget →See the fund grow with compound interest →Organize your monthly spending →

The summary lists your inputs, results, formulas, assumptions and sources. The full report also includes the charts and interpretations, in color. In the print dialog, choose Save as PDF.

Method, assumptions and sources

Formulas

Fund today = essential expenses × months of coverage; target = fund today × (1 + inflation)^(N/12)
Net factor of a deposit invested h months = (1 + i)^h − [(1 + i)^h − 1] × tax; i = equivalent monthly rate
Monthly deposit = (target − already saved × factor(N)) ÷ Σ factor(N − k + 1), k = 1…N (deposits at the start of each month)
How long: smallest N for which the required deposit ≤ the amount you can save

Assumptions and limits

  • Constant rates, deposits at the start of each month and a single tax rate on interest applied at withdrawal.
  • The target grows with the inflation entered until the month the fund is complete. Fees, account minimums and changes in rates or income are not considered.
  • Suggested months of coverage (3, 6 or 12) are a personal finance rule of thumb, not a standard.

Official sources and references

Frequently asked questions

What is an emergency fund?

It is money set aside only for surprises that cut your income or require urgent spending, such as a job loss, an illness or a repair. It keeps an emergency from turning into expensive credit card debt. It should sit somewhere safe that you can withdraw from any day.

How many months of expenses should I save?

A common rule is 3 months with a stable job and two incomes, 6 months with a single salary and 12 months if you are self-employed or your income varies. The less stable your income and the larger your household, the bigger the fund. Use essential expenses, not your salary.

How do I find my essential expenses?

Add what you would pay even with no income: housing, utilities, groceries, transportation, health care, school and debt payments. Your bank and credit card statements for the last 3 months help. Leave out spending you could cut in an emergency, such as entertainment and subscriptions.

How do I read the example result?

With $4,000 of essential expenses and 6 months of coverage, the fund is $24,000 today, about $24,720 in 12 months at 3% inflation. Starting from $1,000 at a 4.5% yield with 15% tax on interest, you need to save about $1,934 a month. That is about 48% of the monthly expenses, so it is a strong but short effort.

Where should I keep the fund?

In low-risk accounts you can access the same day, such as a high-yield savings account at an insured bank, a money market fund or short-term government bills. Avoid stocks, long lockups and early-withdrawal penalties. The yield gap among safe options is small; access and safety matter more.

Why does the target grow over time?

Because inflation raises your expenses while you save. The calculator grows the fund by the inflation rate you enter until the month it is complete. Once the fund is full, update the amount once a year.

When should I get professional advice?

If you carry high-interest debt such as credit card balances, a financial planner can help decide what to prioritize: paying the debt or building the fund. This calculator is an educational simulation with constant rates and does not account for changes in interest rates or income.

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Emergency fund: how much to save and where to keep it

An emergency fund is the money that pays the bills when income suddenly stops: a job loss, an illness, an urgent car or home repair. Without it, the surprise turns into credit card debt, usually the most expensive kind.

How much

Start from your essential monthly expenses, not from your income. Multiply by the months you want covered: about 3 months with a stable job and two incomes, 6 months with one salary and 12 months if you are self-employed or your income varies. With $4,000 of essential expenses and 6 months, the fund is $24,000.

How long

With $1,000 already saved, a 4.5% savings rate, 15% tax on interest and 3% inflation, building that fund in 12 months takes about $1,934 a month. If that does not fit, stretch the time frame: over 24 months the amount drops to a little over half.

Where to keep it

The fund needs same-day access and low risk: a high-yield savings account at an insured bank, a money market fund or short-term government bills. Avoid stocks and anything with withdrawal penalties. The yield difference among safe options is small; safety and quick access matter more.

After it is full

Use it only for real emergencies and refill what you take out. Review the amount once a year or whenever your expenses change, and send new savings to other goals.