How big should an emergency fund be? The usual answer is three to six months of essential expenses, the range FINRA, Fidelity and Vanguard all give. The Points Frog emergency fund calculator turns that range into a dollar target for your own costs and situation.
On $4,000 a month of essentials, three to six months comes to $12,000 to $24,000. Setting aside $500 a month from zero, the low end takes 2 years to save and the high end takes 4.
Many households are not there yet. In the Federal Reserve's survey of household finances for 2025, published in May 2026, 55% of adults had emergency savings that would cover three months of expenses. That is down from 59% in 2021.
How the calculator sets a target
Essentials are the bills you would still pay if your income stopped: rent or mortgage, utilities, groceries, insurance, transportation, minimum debt payments, childcare and health care. Restaurant meals, travel and memberships are left out, since you could cut them in an emergency.
The target starts at 3 months. It adds a month for each risk: one income, a less secure job, dependents or owning a home. Self-employment or irregular income adds two months. The most it reaches is 8 months. Vanguard lists a single income, dependents, income variability and job security among the factors that push the amount up.
Here is what that rule gives on $4,000 a month:
| Situation | Months | Target |
|---|---|---|
| Two steady incomes, no dependents, renting | 3 | $12,000 |
| One income, steady job, renting | 4 | $16,000 |
| Single parent who owns a home | 6 | $24,000 |
| Self-employed single parent who owns a home | 8 | $32,000 |
A worked example
The calculator's starting example is one person with a steady job who rents. Essentials cost $4,000 a month, and $6,000 is saved. One income adds a month, so the target is 4 months, or $16,000.
The $6,000 covers 1.5 months. At $500 a month, the target is 1 year and 8 months away, with $10,000 still to save.
A starter fund comes first: $2,000 or half a month of essentials, whichever is more. That is Vanguard's first milestone for surprise bills. In this example it is already done.
What moves the answer most
Your monthly essentials set the scale. Each extra $1,000 a month in essentials adds $3,000 at the low end of the range and $6,000 at the high end. Your situation sets the number of months. And what you can set aside sets the time:
| Set aside a month | 3 months ($12,000) | 6 months ($24,000) |
|---|---|---|
| $250 | 4 years | 8 years |
| $500 | 2 years | 4 years |
| $1,000 | 1 year | 2 years |
| $1,500 | 8 months | 1 year, 4 months |
Those times start from zero on $4,000 a month of essentials. Doubling what you set aside halves the time.
What the calculator leaves out
It leaves out interest, which would get you there a little sooner. It assumes you set aside the same amount each month. The page notes that the right amount also depends on your health, your insurance, your other savings and how easily you could borrow in a pinch. It is an educational estimate, not financial advice.
On where to keep the money, the page follows the CFPB: a savings account of its own that is safe, quick to reach and apart from everyday spending. That can be a high-yield savings or money market deposit account at an FDIC-insured bank, or a savings account at a federally insured credit union. Each insures deposits up to $250,000. A money market fund at a brokerage is a common alternative, but it is a mutual fund, not an insured deposit.
Where the figures come from
The three-to-six-month range comes from FINRA (March 13, 2026), Fidelity (July 16, 2026) and Vanguard (October 1, 2026). The survey figures are from the Federal Reserve's Survey of Household Economics and Decisionmaking, fielded in October 2025. In it, 63% of adults said they would cover an unexpected $400 expense with cash or its equivalent, and 12% said they could not pay it by any means.
Use it on your own site
The emergency fund calculator is free to embed on a blog or site with copy-and-paste code, and it carries no ads or tracking. Here is how to embed it.
Source: Federal Reserve, Economic Well-Being of U.S. Households in 2025, May 2026; Vanguard, October 1, 2026; FINRA, March 13, 2026; Fidelity, July 16, 2026. Figures checked October 2026. Figures are educational estimates, not financial advice.