緊急資金計算機

支出に基づいて必要な緊急資金の額とその達成期間を計算します。

An emergency fund is your financial safety net - cash set aside for unexpected expenses like job loss, medical emergencies, or major car repairs. Financial experts recommend 3-6 months of essential living expenses in a high-yield savings account. This fund isn't an investment; it's insurance. Having a fully funded emergency fund is the foundation of financial stability, preventing you from going into debt when life throws curveballs.

この計算機の使い方

Enter your monthly essential expenses, current savings balance, how much you can save each month, and your target number of months of coverage.
Standard recommendation is 3-6 months (3 for dual-income households, 6 for single-income or variable income).
The calculator shows your target amount, current coverage, shortfall, and timeline to goal..

計算式と具体例

Target Amount = Monthly Expenses × Target Months:

Current Coverage = Current Savings ÷ Monthly Expenses.

Shortfall = Target - Current Savings (if positive).

Months to Goal = Shortfall ÷ Monthly Savings (if monthly savings > 0).

Example: $4K/month expenses × 6 months = $24K target.

At $5K saved: shortfall = $19K.

At $800/month savings: 24 months to goal..

業界ベンチマーク

Financial experts universally recommend 3-6 months of expenses. Single-income households should aim for 6 months. Dual-income: 3 months. Freelancers and gig workers: 6-12 months due to income variability. The average US household has only $5K in savings - far short of the recommended amount. Only 44% of Americans could cover a $1K emergency with savings. Use Ally Bank or Marcus for high-yield savings accounts.

指標	値	出典
Standard Recommendation	3-6 months of expenses	Financial Experts
Single-Income Household	6 months recommended	Financial Experts
Freelancer / Variable Income	6-12 months recommended	Financial Experts
Average US Household Savings	~$5,000	Federal Reserve 2025
US Households Could Cover $1K Emergency	44%	Federal Reserve 2025
High-Yield Savings Account Rate	3.5-5.0% APR	Bankrate 2025

よくある質問

How much should I have in my emergency fund?expand_more

3-6 months of essential expenses (rent/mortgage, utilities, food, insurance, minimum debt payments). Not your full income - just essentials. For a single-income household or freelancer, aim for 6-9 months. Dual-income households can manage with 3 months. Calculate your number precisely with this tool.

Where should I keep my emergency fund?expand_more

High-yield savings account (HYSA) earning 3.5-5.0% APR. NOT in stocks (too volatile for short-term needs). NOT in a checking account (too easy to spend). A HYSA at Ally, Marcus, or SoFi offers the right balance of accessibility, safety (FDIC insured), and yield. Compare savings rates on NerdWallet.

Should I pay off debt or build an emergency fund first?expand_more

Build a mini emergency fund of 1 month's expenses first ($1-2K), then pay off high-interest debt (credit cards over 15% APR), then build the full 3-6 month fund. This balanced approach provides a safety net while aggressively attacking expensive debt.

What counts as an emergency?expand_more

Job loss, medical emergency, major car repair, urgent home repair (leaking roof, broken HVAC), unexpected travel for family emergencies. NOT: vacation, Black Friday deals, home renovation, new electronics, or wedding expenses. If it's optional or planned, it's not an emergency.

How do I rebuild my emergency fund after using it?expand_more

Treat the depleted fund as priority #1. Temporarily reduce other savings (retirement, investing) and redirect all available cash to rebuilding. Most people should rebuild within 3-6 months if they redirect their normal savings rate. Consider pausing non-essential spending until the fund is restored.

Does health insurance affect emergency fund needs?expand_more

Yes. If you have good health insurance with a low deductible ($1-2K), you can lean toward 3 months of expenses. If you have a high-deductible plan ($5-10K+), lean toward 6+ months. Your emergency fund should be able to cover your out-of-pocket maximum plus living expenses.

How does job stability affect my emergency fund target?expand_more

High stability (tenured professor, government worker): 3 months is sufficient. Medium stability (established professional): 4-5 months. Low stability (startup employee, freelancer, gig worker): 6-12 months. The more variable your income, the larger your safety net should be.

What is the difference between an emergency fund and a sinking fund?expand_more

Emergency fund = unplanned, urgent expenses. Sinking fund = planned, expected expenses (car registration, annual insurance, holiday gifts). Sinking funds prevent true emergencies by smoothing out predictable irregular expenses. Have separate sinking funds for known upcoming costs.