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Emergency Fund Calculator
How many months of expenses to hold, and where.
What it does. The usual advice of three to six months of expenses is a starting point, not an answer. What matters is essential costs rather than total spending, and how long your income would realistically take to replace — which differs enormously between a salaried nurse and a freelance contractor with one client.
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How to use Emergency Fund Calculator
- Enter essential monthly costs — the ones that continue regardless.
- Set income stability, dependants and existing cover.
- Read the recommended range and what you already have.
Essential costs, not total spending
The mistake is calculating from what you currently spend. An emergency fund covers what you cannot stop spending: rent or mortgage, utilities, food, insurance, transport, debt minimums, childcare.
Subscriptions, dining out, holidays and discretionary shopping stop immediately in a real emergency and should not be in the figure.
Calculating from essentials typically produces a target 30–40% lower than calculating from total spending, which is the difference between a goal people reach and one they abandon.
How long, depends on you
| Situation | Months |
|---|---|
| Two stable incomes, no dependants | 3 |
| One stable income, no dependants | 4–6 |
| Single income with dependants | 6 |
| Freelance or commission-based | 6–12 |
| One client or a narrow specialism | 9–12 |
| Approaching retirement | 12+ |
The variable underneath all of these is how long it would take to replace the income. A specialist role in a small market takes far longer to replace than a common one, regardless of how stable it feels while you have it.
Where it lives matters
Instant access, separate from the current account, and not invested. All three conditions matter.
Not invested is the one people argue with. An emergency fund exists to be available on the worst day, and the worst day for your income correlates with the worst day for markets — job losses and crashes arrive together.
Separate from the current account is the second: money sitting in the account you spend from gets spent. A different account, ideally at a different institution, adds enough friction to stop the fund quietly eroding.
Frequently asked questions
How many months should an emergency fund cover?
Three for two stable incomes with no dependants; six for a single income with dependants; nine to twelve for freelance work or a narrow specialism. The real variable is how long your income would take to replace.
Should I use total spending or essential costs?
Essential costs — the ones that continue regardless. Subscriptions, dining out and holidays stop in a real emergency. Using essentials typically lowers the target by 30–40%.
Should I invest my emergency fund?
No. It needs to be available on the worst day, and the worst day for your income tends to coincide with the worst day for markets — job losses and crashes arrive together.
Emergency fund or pay off debt first?
Usually a small buffer first — around one month — then high-interest debt, then build the full fund. Without any buffer, the next unexpected bill goes back onto the card you were paying down.
Where should I keep it?
Instant-access savings, separate from your current account and ideally at a different institution. Money in the account you spend from gets spent.