How big your emergency fund should actually be

Your emergency fund target is your monthly essential expenses times a number of months that starts at 3 and rises for variable or freelance income and for each dependent, falling by one month if you carry income-protection insurance.

Worked example: with Monthly essential expenses of 2,500, this model computes Amount still needed of 14,500. See the full breakdown.

✓ 4 self-test cases · assumptions shown No rates to go out of date · reviewed 2026-08-02

How emergency fund sizing is worked out

Nearly every emergency-fund calculator gives the same answer regardless of who is asking: three to six months of expenses. That range is a reasonable starting point, but it hides the actual drivers — how likely you are to lose the income in the first place, and how many people depend on it.

This model starts from a 3-month base and adjusts it: +2 months for variable income (commission, shift work, an at-risk role), +3 months for freelance or self-employed income, +1 month per dependent up to 3, and -1 month if you carry income-protection or critical-illness insurance, with a floor of 3 months so the adjustments can only add caution, never remove the baseline.

From the target it is simple arithmetic: multiply by your monthly essential expenses for the fund size, subtract what you already hold for the shortfall, and divide the shortfall by your monthly saving capacity for how long it takes to close. Change any input and every number moves with it — nothing here is a fixed table.

Worked example

freelancer with a dependent, partially funded — the baseline scenario
Monthly essential expenses	2500
Current emergency savings	3000
Can save toward it each month	500
Income stability	freelance
Dependents	1
I have income-protection or critical-illness insurance	no
Recommended months ✓	7
Target fund size ✓	17500
Current Coverage Months ✓	1.2
Amount still needed ✓	14500
Months To Target ✓	29
Percent funded ✓	17.1

Every row is computed by the engine from the inputs above. Rows marked ✓ are additionally pinned by a published self-test vector.

Frequently asked questions

How many months of expenses should I actually save?

Start at 3 months and add for risk: +2 for variable income, +3 for freelance or self-employed, +1 per dependent up to 3, then -1 if you have income-protection insurance. A stable single earner with no dependents needs the least; a freelancer with children and no insurance needs the most — often 8 or 9 months, not the generic "6 months" every other calculator quotes.

Should the emergency fund include discretionary spending?

No — size it to essential expenses only (housing, utilities, food, insurance, minimum debt payments). Discretionary spending is the first thing you would cut in an actual emergency, so including it overstates what you need to survive one.

Does having insurance mean I need less saved?

It reduces the target by one month here, on the logic that income-protection or critical-illness cover replaces part of your income during the gap. It does not remove the need for a fund entirely — most policies have a waiting period before payouts start, which the fund still has to cover.

What if my saving capacity is zero?

The model still shows the target and the shortfall, but instead of dividing by zero and claiming a false "0 months to go", it tells you plainly that the gap will not close on its own until you can put something toward it each month.

Sources

Projection, not advice. The badge means the engine reproduces this model's own arithmetic through 4 self-test cases. It says nothing about whether the assumptions above will hold — nobody can verify a forecast. What this page offers instead is that every assumption is visible, editable, and traceable to the figure it moves.

Check the arithmetic yourself: how this calculator is verified — the formula behind every derived value, the 4 test cases the engine reproduces, and what the badge does and does not claim. Also available as machine-readable JSON.

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