Emergency fund calculator
An emergency fund is sized on what you must pay to keep the lights on, not on what you normally spend. Enter the bills that do not stop when income does.
This is an estimate, not advice. It assumes your essential costs stay flat and ignores any interest the savings earn, which is deliberate — an emergency fund is held for access, not return. Your own number depends on job security, health cover and who relies on your income.
Why the target is built on essentials, not income
A lot of guidance sizes an emergency fund against salary, which produces a number that is either too big to ever reach or too small to be useful. Sizing it against what you must pay each month is more honest, because that is the figure the fund has to cover if income stops.
The distinction matters most in the middle of the list. Rent, utilities and minimum debt payments are obvious essentials. Subscriptions, eating out and travel are obvious extras. The awkward ones are things like childcare, which you may not be able to drop without losing the ability to work, and insurance premiums, which are exactly what you cannot afford to lapse in the month something goes wrong. Put those in.
Three months or six
Three to six months of essential costs is the range most commonly cited, and the choice between them is not really about discipline — it is about how long your income would realistically take to replace. A salaried role in a field with steady hiring sits at the lower end of that range. Commission-based earnings, freelance or contract work, seasonal work, or a specialised role with few local employers all argue for the upper end, because the gap you are covering is longer and less predictable.
Two other things push the number up. A single income supporting a household has no second earner to fall back on. And anyone who depends on you — children, a partner who is not working, a relative you help support — raises the cost of being wrong. If you are weighing three against six and cannot decide, the useful question is not which is correct but how many months it would take you to find equivalent work.
Where the money should sit
An emergency fund is held for access, not return. The test is whether you could have the cash in hand within a day or two without a penalty, a settlement delay or a market loss. That generally means a savings account you can transfer from immediately. It generally rules out anything with a withdrawal charge, a fixed term, or a balance that moves with the market — because emergencies have a habit of arriving in the same conditions that push markets down.
This is also why the calculator above assumes no investment return. Over a horizon this short, in an account you can actually withdraw from the same week, the interest is small enough that including it would imply a precision the estimate does not have.
Building it when the gap looks large
A six-month target can look impossible from a standing start, and the number itself is often the thing that stops people beginning. Two framings help. The first is that partial cover is not wasted: one month of essentials in hand is the difference between an unexpected bill being an inconvenience and being new credit card debt. The second is that the fund only has to be built once, then topped up.
If you are carrying high-rate debt at the same time, the usual sequence is a small starter buffer first, then the debt, then the full fund — the buffer stops the next surprise from undoing the debt payments. Our debt payoff calculator will show what that debt is costing you each month, and the 50/30/20 budget calculator shows how much room your take-home pay leaves for both. For more on the reasoning, see emergency funds and how to prepare for the unexpected.
