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This is a planning estimate, not financial advice. How much you need depends on your own circumstances — job security, dependents, health and other factors. Use it as a starting point, not a fixed rule.

Emergency Fund Calculator

Work out how big your emergency fund should be, and how long it could take to build one.

£Your Target Fund

£
Rent/mortgage, bills, food, insurance, minimum debt payments — not discretionary spending. Enter an amount between £0.01 and £100,000.
3 months is a common starting point. Consider more if your income is irregular, you’re self-employed, or you’re the sole earner.

£Build Your Fund

£
Enter an amount between £0 and £10,000,000.
£
Enter an amount between £0 and £100,000.
%
Enter your savings account’s actual rate, if any. Leave at 0 if you’re not sure — rates vary by account and change over time. Enter a rate between 0 and 20%.
Target Emergency Fund
£0 saved Target

Full Breakdown

How this calculator works: It multiplies your monthly essential expenses by your chosen number of months to set a target fund, then projects your current savings forward month by month — adding your monthly contribution and any interest — until you reach that target. This is a planning estimate, not financial advice; how much cover you actually need depends on your own circumstances. For a wider view of your finances, try the Net Worth Calculator, or the Debt Repayment Calculator if you’re balancing saving with paying down debt.

Emergency Fund Calculator

An emergency fund is money set aside to cover essential costs if something unexpected happens — job loss, a boiler breaking down, an unplanned car repair, or a period of illness. This Emergency Fund Calculator helps you work out a target amount based on your own expenses, then estimates how long it could take to build that fund from your current savings and monthly contributions.

How to Use This Calculator

  1. Enter your monthly essential expenses. Include rent or mortgage, utility bills, food, insurance and minimum debt repayments — the costs you couldn’t easily cut if your income stopped.
  2. Choose how many months of cover you want. 3 months is a common starting point; consider more if your income is irregular, you’re self-employed, or you’re the sole earner in your household.
  3. Enter your current emergency savings and how much you can contribute each month.
  4. Click Calculate to see your target fund, current coverage, shortfall, and an estimated timeline to reach your goal.

How Much Should I Have in an Emergency Fund?

There’s no single figure that suits everyone, but a commonly cited guideline is 3 to 6 months of essential expenses — enough to cover the basics while you find new income or deal with an unexpected cost. You might aim higher, towards 9–12 months, if your income is irregular, you’re self-employed, you’re the sole earner for your household, or you work in a less secure industry. If you’re just starting out, even a smaller starter fund of a few hundred pounds is a meaningful first step before working up to a full target.

What Counts as an “Essential” Expense?

  • Rent or mortgage payments
  • Utility bills — energy, water, broadband, phone
  • Groceries and essential household costs
  • Insurance premiums
  • Minimum debt repayments
  • Council tax and other regular bills you couldn’t avoid

Discretionary spending — subscriptions, eating out, holidays — is usually left out of this figure, since it’s the first thing most people would cut if their income stopped.

Where Should I Keep an Emergency Fund?

Most people keep an emergency fund in an easy-access savings account, so it can be withdrawn quickly without penalty if needed. This usually means lower returns than tying money up in longer-term investments, but the trade-off is intentional — the point of an emergency fund is being able to reach it immediately, not maximising growth.

Frequently Asked Questions

How many months of expenses should I save?

A commonly cited guideline is 3 to 6 months of essential expenses, though the right figure depends on your circumstances. Consider more — towards 9 or 12 months — if you’re self-employed, have an irregular income, or are the sole earner in your household. There’s no fixed rule; use it as a starting point rather than a strict target.

Should I pay off debt or build an emergency fund first?

Many people build a small starter emergency fund first — enough to cover a genuine unexpected cost — before focusing more heavily on paying down debt, then top up the fund further afterwards. This avoids relying on credit cards or loans for emergencies while debt is being repaid. The right balance depends on your interest rates and circumstances; our Debt Repayment Calculator can help you compare payoff strategies.

What should I include in my monthly expenses figure?

Include the costs you couldn’t avoid if your income stopped — rent or mortgage, utility bills, food, insurance, minimum debt repayments and similar essentials. Leave out discretionary spending like subscriptions, eating out or holidays, since these are usually the first things people cut back on in an emergency.

Should my emergency fund earn interest?

It’s sensible to keep an emergency fund in an interest-earning easy-access savings account rather than earning nothing in a current account, as long as you can still withdraw it quickly without penalty. Avoid accounts with withdrawal restrictions or notice periods for this money, since easy access is the main point of an emergency fund.

What if I can’t reach my target within a reasonable time?

If the calculator shows a long timeline, consider increasing your monthly contribution, starting with a smaller interim target (such as one month of expenses) before working towards the full amount, or reviewing your budget for spending that could be redirected towards savings.

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