工具 · 应急基金

你的应急基金该有多大？

经典的“3 到 6 个月”法则只是起点——你的真实数字取决于你的支出和收入的稳定程度。这是你的数字，以及你离它有多近。

Last updated: June 2026

An emergency fund is cash held in an easily accessible, low-risk account (like a savings account) specifically to cover unplanned expenses or a sudden loss of income — without having to sell investments at a bad time or go into debt. The commonly cited guideline is 3 to 6 months of essential expenses, though the right number depends heavily on your circumstances.

How the target is calculated

The baseline math is straightforward: (monthly essential expenses) × (months of coverage). Essential expenses means housing, utilities, food, insurance, minimum debt payments, and other non-discretionary costs — not your full current spending, which may include savings and discretionary items you could cut in a crunch.

Why 3-6 months isn't one-size-fits-all

Dual-income households with stable employment (e.g., government jobs) can often lean toward 3 months, since a lost income is only a partial income shock and typically easier to replace. Single-income households, commission-based or gig income, self-employed people, and those in volatile industries are frequently advised toward 6-12 months, because both the probability and the duration of an income gap are higher.

Why it matters

Without a cash buffer, an unexpected expense (medical bill, car repair, job loss) often gets funded with high-interest credit card debt or by selling investments during a downturn — locking in losses at the worst possible time. An adequately sized fund is also what makes every other calculator on this site (runway, severance planning, sabbaticals) actually usable, since it's the floor beneath any income gap.

Common pitfalls

Keeping the fund in a checking account earning near-zero interest wastes purchasing power to inflation — a high-yield savings account is the standard recommendation. Equally common: counting money you'd actually need to liquidate a retirement account (with tax penalties) as part of the "emergency" fund, which defeats its purpose of being instantly accessible without cost.

稳定薪资 → 3。收入不稳定/自由职业或单一收入 → 6–12。

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规划更大的退出 → 储蓄目标
应急基金应保持流动（高息储蓄），与你的退出基金分开。属于教育，而非建议。

Frequently asked questions

How much should I have in an emergency fund?
A common guideline is 3–6 months of essential expenses. Aim for 3 with stable dual income and few dependents, and 6–12 if you're a single earner, self-employed, or have dependents or variable income.
How is an emergency fund calculated?
Multiply your essential monthly expenses — rent/mortgage, food, utilities, insurance, minimum debt payments — by the months of cover you want. Use bare-bones survival spending, not your full lifestyle budget.
Where should I keep my emergency fund?
In a safe, liquid account you can access instantly without losing value — typically a high-yield savings account. Don't invest it in stocks; you may need it exactly when markets are down.
Is an emergency fund the same as a quit fund?
No. An emergency fund covers shocks while you're still employed. A quit fund must also cover lost income, health insurance and a longer runway, so it's usually larger — size the emergency layer first here.