How to use the emergency fund calculator
The calculator opens with a worked example. Replace each figure with your own from a recent bank statement.
- Essential monthly expenses. Enter what you pay each month for housing, utilities, groceries, transport, insurance and the minimum payments on your debts. Add childcare, medication or anything else you could not stop paying under Other essentials. For bills paid yearly, divide by 12.
- Months of cover. Pick 3, 6, 9 or 12 months. The hint under the buttons explains who usually needs more.
- Current emergency savings. Count only cash you could reach within a few days without penalties, not retirement accounts or investments.
- Monthly saving and the interest rate your savings account pays.
The chart traces your fund until it crosses the target line; the table compares every level of cover.
How the target is calculated
Still to save = Target − Current savings
Funded = Current savings ÷ TargetEssential monthly expenses is the sum of the seven expense lines. If current savings already exceed the target, nothing is left to save.
To find the time to reach the target, the calculator adds one month at a time: interest on the balance at the monthly equivalent of the APY, then your deposit at the end of the month.
A worked example
Essential costs in the example add up to $3,500 a month: $1,500 for housing, $600 for groceries, $400 for transport and smaller amounts for utilities, insurance, debt and other essentials.
Six months of cover sets the target at $21,000. With $5,000 already saved, the fund is 24% complete and $16,000 is still to go.
Saving $500 a month in an account paying 3%, the target is reached in 2 years 7 months. Interest contributes $984 along the way.
Three, six or twelve months?
The three-to-six-month guideline is a starting point. The real question is how long it might take to replace your income.
| Cover | Target | Time to reach it at $500 a month |
|---|---|---|
| 3 months | $10,500 | 11 months |
| 6 months | $21,000 | 2 years 7 months |
| 9 months | $31,500 | 4 years 1 month |
| 12 months | $42,000 | 5 years 7 months |
People who often aim for the top of the range or beyond:
- Single-income households, where one job loss stops all earnings.
- Self-employed people and freelancers, who have no unemployment benefits in many cases and whose clients can disappear together.
- Variable or commission-based pay, where a slow quarter is normal rather than an emergency.
A dual-income household with stable jobs and good insurance may be comfortable nearer three months.
The monthly amount matters most
Interest barely moves the finish date; the deposit does. Saving $250 a month instead of $500 stretches the six-month fund to 4 years 9 months, while $1,000 a month gets there in 1 year 4 months. If the gap feels large, a first milestone of one month of expenses helps, and automatic transfers on payday make the saving happen before the money is spent.
Where to keep the fund
An emergency fund has one job: to be there, at full value, when you need it. That rules out anything whose price moves, such as stocks or long-term bonds. The usual homes are:
- A high-yield savings account, which pays more than a typical checking account and lets you move money out within a day or two.
- A money market account or money market fund, which pays a rate that tracks short-term interest rates. Money market accounts at banks carry deposit insurance; money market funds at brokerages do not, though they hold very short-term, high-quality debt.
Keeping the fund apart from your everyday account adds a small hurdle against spending it on non-emergencies. Rates on both move with central bank policy.
What this calculator does not include
- Income during a job loss. Unemployment benefits or a partner’s income may cover part of your costs, which would lower the fund you need.
- Large one-off costs. An insurance deductible can exceed a month of expenses; some people add their highest deductible to the target.
- Inflation. Expenses rise over time, so review the target once a year.
- Taxes on interest. In the US, savings interest is taxable income.