Saving & investing

Emergency Fund Calculator

An emergency fund is easier to plan when it is tied to the bills that would continue if income stopped. Build the target from your own essential spending rather than a generic round number.

Free calculatorInputs saved only in this browser

Essential monthly costs

Use the costs that would continue even if you cut discretionary spending.

£
Rent, mortgage and essential service charges.
£
£
£
£
£
£

Your safety buffer

Choose the buffer and how you plan to build it.

months
£
£
% AER
months
Used to show what monthly saving would be needed to hit the full target in that time.

Your estimate

Use the result as a planning guide and change inputs to test the assumptions that matter most.

How this calculator works

The calculator totals the essential monthly costs you enter, multiplies that figure by your chosen number of months of cover and compares the target with your current emergency savings.

It also estimates how long your regular monthly saving could take to close the gap using the savings rate entered.

How to use it

  1. Enter only costs you would still need to cover during an income shock.
  2. Choose how many months of essential spending you want available.
  3. Enter savings already earmarked for emergencies.
  4. Add the amount you can contribute each month and an optional savings rate.
  5. Use the result to set a first milestone rather than waiting until the entire target feels achievable.

Assumptions and limitations

There is no universal correct emergency-fund size. Job security, household income sources, insurance, dependants, health, access to credit and the variability of essential costs all matter. Investment returns are not appropriate assumptions for money that needs to be readily accessible.

Understand the decision

Helpful guides for this calculator

Use the calculator for the numbers, then use these guides for the practical choices, trade-offs and next steps behind the result.

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