This emergency fund calculator shows how large your rainy-day savings should be and how many months it will take to reach your target. Enter your monthly essential expenses, how many months of cover you want, your current savings and how much you can set aside each month.
Target + time to build
An emergency fund is money set aside specifically for unexpected events: redundancy, illness, major home repairs, or car breakdowns. Without one, these events force you into debt — credit cards at 20%+ APR, payday loans, or overdrafts. A properly sized fund breaks this cycle and provides financial security.
The standard recommendation is 3 to 6 months of essential expenses. "Essential" means rent or mortgage, council tax, utilities, food, transport and insurance — not holidays, subscriptions or dining out. In a genuine emergency, you would cut non-essentials immediately.
| Situation | Recommended cover |
|---|---|
| Dual income, stable jobs, no dependants | 3 months |
| Single income, employed, with dependants | 6 months |
| Self-employed or contractor | 6 – 9 months |
| Sole earner in volatile industry | 9 – 12 months |
These are guidelines, not rules. The right number is whatever lets you sleep at night knowing you can handle a surprise without borrowing.
Step 1: Start with £1,000. This covers most single emergencies (car repair, boiler fix, appliance replacement). Even on a tight budget, setting aside £50 a week gets you there in 5 months.
Step 2: Clear high-interest debt. Once you have the £1,000 buffer, divert savings towards credit cards and loans (see the debt repayment calculator). Debt at 20%+ costs more than any savings account pays.
Step 3: Build to 3-6 months. After high-interest debt is cleared, automate a standing order into an easy-access savings account and leave it alone until needed.
Use windfalls. Tax refunds, bonuses, cashback rewards and birthday money are ideal for accelerating your emergency fund without changing your monthly budget. Even redirecting half a windfall to the fund makes a meaningful difference while still letting you enjoy part of the unexpected money.
The priority is instant access, not maximum return. An easy-access savings account with a competitive interest rate is ideal. Cash ISAs work if you want tax-free interest. Avoid notice accounts, fixed-term bonds, or investment platforms — you need the money available within hours, not days or weeks.
If you are a basic-rate taxpayer, the personal savings allowance lets you earn £1,000 of interest tax-free. Higher-rate taxpayers get £500. Use the personal savings allowance calculator to check whether your interest is taxable.
Once you dip into your emergency fund, rebuilding it should become your top financial priority. Treat the replenishment like a bill — set up the standing order again at the same amount and let it run until the fund is restored. Avoid the temptation to reduce the target just because "it probably won't happen again." Emergencies cluster: a redundancy can coincide with a car breakdown or a health issue, and that is exactly when you need the full buffer.
If you find yourself repeatedly raiding the fund for non-emergencies, create a separate sinking fund for predictable irregular expenses — car servicing, holiday spending, Christmas gifts, and appliance replacement. A sinking fund covers planned costs so your emergency fund stays intact for genuine surprises.
The savings calculator shows interest earned on a lump sum over time. To plan monthly saving alongside debt payoff, use the debt repayment calculator. The take-home pay calculator helps you see how much of your salary is available for saving after tax and bills.
Most financial planners recommend 3 to 6 months of essential expenses. If you are a sole earner, self-employed, or in a volatile industry, aim for the higher end or even 9 to 12 months. Essential expenses include rent or mortgage, food, utilities, transport, insurance and minimum debt payments — not discretionary spending.
In an easy-access savings account, ideally one that pays interest but allows instant or same-day withdrawals. A cash ISA can work if you want tax-free interest. Avoid fixed-term accounts, investment accounts or anything with withdrawal penalties — the whole point is instant access when you need it.
It depends on how much you can save each month. If your target is £9,000 (3 months at £3,000/month expenses) and you save £500/month, it takes 18 months. The calculator above models this exactly. Start small — even £1,000 covers most single emergencies like a car repair or appliance replacement.
Yes, but a smaller one. Build a starter emergency fund of £1,000 to £2,000 first, then focus on paying off high-interest debt. Without any buffer, an unexpected expense forces you to borrow more, creating a debt spiral. Once high-interest debt is cleared, build the fund up to 3 to 6 months.
An emergency is an unexpected, urgent expense or loss of income: redundancy, illness, major car or home repair, emergency travel, or an urgent medical need. It is not a holiday, a sale, or a planned purchase. Having a clear definition prevents the fund from being raided for non-emergencies.
Three months is a good starting point for dual-income households with stable employment. If you are a sole earner, self-employed, a contractor, or in a sector with frequent redundancies, aim for 6 to 12 months. The right amount depends on how quickly you could replace your income if you lost it.
Yes, if you put it in an interest-bearing savings account. Easy-access savings accounts currently offer around 3% to 5% depending on the provider. On a £10,000 fund at 4%, that is £400 per year in interest. If you are a basic-rate taxpayer, the personal savings allowance lets you earn £1,000 of interest tax-free.