Your emergency fund target is your essential monthly costs multiplied by the number of months you want to cover. Enter the costs you would still have to pay if your income stopped or a large bill arrived, choose how many months to cover, and see what is left to save.
What counts as an essential cost
Include costs you would still need to pay: rent or your home payment, utilities, groceries, transport, insurance, health costs, childcare and required debt payments. Exclude only spending you could genuinely pause. Do not leave out an essential bill just to make the target smaller.
A worked example
Sam is hypothetical. All example amounts are US dollars, not typical living costs or a recommended reserve.
Sam’s essential costs are 1,200 for rent, 180 for utilities, 450 for groceries, 220 for transport, 150 for insurance and health costs and 100 in minimum debt payments: 2,300 a month. Three months of cover is 6,900. Sam has 1,500 saved, which covers about 0.6 months, so 5,400 is still needed. Adding 300 a month would reach the target in 18 months.
How many months should you choose?
There is no single right number. The Consumer Financial Protection Bureau’s emergency fund guide says the amount depends on your situation and suggests looking at the unexpected expenses you have had before and what they cost. People with irregular pay, one income in the household or costly equipment to replace may want more months; others may start with one month and build from there. Even a small first goal gives you some protection.
How the calculation works
The calculator adds your essential costs, multiplies them by your chosen months and subtracts what you have already saved. If you enter a monthly amount you can add, it divides the remaining gap by that amount and rounds up to whole months. It does not include any growth on the balance, and it does not tell you where to keep the money.
The timeline assumes unchanged costs, the same contribution each month and no withdrawals. A month-of-costs target models a period without income; it does not guarantee every unexpected bill is covered. Enter figures in one currency; Display currency changes labels only, not exchange rates. These are educational estimates, not personalized financial advice.
When this target does not fit
If you are behind on essential bills, catching up on those may come first. If your costs change through the year, use a cautious monthly figure based on your more expensive months. Insurance deductibles or a known repair can be planned separately with the sinking funds calculator, so they do not drain your emergency savings.
Next steps: set a deposit plan with the savings goal calculator, or check where the monthly amount can come from with the 50/30/20 budget planner.