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Emergency Fund Calculator

Turn essential monthly costs into editable reserve scenarios, see current coverage and model how long regular contributions may take.

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Build low, base and high reserve scenarios

Formatting only; no exchange conversion.
Optional constant planning rate.

Essential monthly expenses

Target and funding assumptions

Saved plans on this device

Expense categories, balances and contributions remain local and are not added to URLs or analytics.

How the emergency-fund target works

Direct answer: add your essential monthly expenses, multiply by an editable number of months and add any separate one-off contingency reserve. ToolBullet then compares the target with current savings and models regular contributions.

Target reserve = essential monthly expenses × target months + one-off contingency
Example: essential costs of 2,500 a month, a six-month target and a 1,000 contingency produce a 16,000 reserve. With 4,000 saved, the funding gap is 12,000 and current coverage is 1.60 months.
Model boundaries
  • Low, base and high scenarios are editable; none is presented as universally correct.
  • Monthly interest uses the equivalent rate from the entered annual effective rate, not annual rate divided by 12.
  • Contributions are added at month end and rates are assumed constant.
  • Known annual expenses should usually be planned separately rather than treated as emergencies.
  1. CFPB: emergency funds as reserves for unplanned expenses
  2. MoneyHelper: three-to-six-month rule of thumb and instant-access context

A planning range, not a universal prescription

Income stability, household size, insurance, dependants, health needs and access to support can materially change a suitable reserve. The calculator shows low, base and high assumptions side by side so the user owns the target.

Read the emergency-fund guide →

Method reviewed 11 July 2026. Assumptions, examples and primary sources are visible on this page and in the linked guide.

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Emergency Fund Calculator FAQ

How is the emergency-fund target calculated?

ToolBullet adds the entered one-off contingency reserve to essential monthly expenses multiplied by the selected number of months. Low, base and high month assumptions are editable.

How many months of expenses should I save?

There is no universal answer. MoneyHelper describes three to six months of essential outgoings as a common rule of thumb, while the appropriate amount depends on income stability, dependants, insurance and access to other support.

What counts as an essential expense?

Use costs that would continue during an income disruption, such as housing, utilities, basic food, transport, insurance, essential care and minimum debt payments. Planned annual spending belongs in a sinking fund rather than an emergency fund.

How is the completion time estimated?

The current balance grows using the monthly equivalent of the entered annual effective rate, then the monthly contribution is added at month end until the base target is reached.

What if I enter a zero monthly contribution?

The model can still reach the target if positive growth alone is sufficient. Otherwise it reports that no completion is reached within the 100-year calculation limit.

Does the currency selector convert values?

No. It changes labels and formatting only. Enter all expenses, savings and contributions in the same currency.

Is this financial advice?

No. It is a planning model based on user-entered assumptions. It does not assess benefits eligibility, insurance, tax, investment risk or personal suitability.