Personal resilience

Emergency fund calculator

A useful emergency fund is not just a savings total. It is the number of essential months your remaining cash can cover after an immediate shock and any reliable replacement income.

Open the full model Try it on this page

Live model

Change an assumption.
Read the consequence.

The page is statically rendered and crawlable. The editor below loads Continuum’s production evaluator and stores nothing.

Production modelLoading live evaluator

Editable source

# Emergency fund coverage
cash_reserve = 18000 in usd
essential_spending = 2500 in usd
replacement_income = 500 in usd
shock_cost = 3000 in usd
target_months = 6
post_shock_reserve = cash_reserve - shock_cost
monthly_drawdown = essential_spending - replacement_income
coverage_months = post_shock_reserve / monthly_drawdown
target_reserve = target_months * monthly_drawdown
target_gap = target_reserve - post_shock_reserve

Inputs

What the model needs

Cash reserve: Liquid money that is genuinely available for an emergency.
Essential spending: Housing, food, utilities, insurance, and unavoidable minimums.
Replacement income: Reliable monthly income that would continue during the disruption.
Shock cost: An immediate repair, medical bill, deductible, or similar expense.
Target months: The buffer you want the post-shock reserve to cover.

Method

Formulas stay visible

post_shock_reserve = cash_reserve - shock_costmonthly_drawdown = essential_spending - replacement_incomecoverage_months = post_shock_reserve / monthly_drawdowntarget_gap = target_months × monthly_drawdown - post_shock_reserve

Continuum keeps the authored source canonical. The full production template adds interpretation and a richer preview without hiding these relationships.

Worked example

A six-month target after a repair

$18,000 reserve
$3,000 immediate shock
$2,500 essential spending
$500 replacement income

Result$15,000 remains and covers 7.5 months of a $2,000 monthly drawdown.

The reserve remains $3,000 above the stated six-month target. That margin disappears quickly if replacement income is uncertain.

Stress-test it

Remove replacement income to test the more conservative case.
Increase the shock cost to the largest plausible deductible or repair.
Use essential spending, not an optimistic month with deferred bills.

Use it when

Setting a first emergency-fund target
Checking resilience before changing jobs
Testing whether a large purchase would leave enough cash

Know the boundary

The model does not estimate investment liquidity, taxes, or benefit eligibility.
Treat uncertain replacement income as zero or test both cases.
This is planning information, not individualized financial advice.

Questions

How many months should an emergency fund cover?

There is no universal number. Job stability, dependants, insurance, debt minimums, and access to other reliable income all change the appropriate target.

Should investments count as emergency savings?

Only include assets you can access quickly and are willing to sell during a downturn. Many people model cash separately for a more conservative result.

What if monthly drawdown is zero?

If reliable replacement income fully covers essential spending, the simple coverage ratio becomes open-ended. The reserve still matters for shocks and income uncertainty.

Keep the reasoning

Turn this example into
your living model.

The full template opens as a local Continuum document. Edit every assumption, use the production preview, and keep the source.

Open emergency fund calculator

Emergency fund calculator

What the model needs

Formulas stay visible

Stress-test it

Use it when

Know the boundary

Turn this example intoyour living model.

Cash runway calculator

Structured thinking with numbers

Mortgage repayment calculator

Turn this example into
your living model.