How big should your emergency fund be?
An emergency fund covers essentials - housing, utilities, food, transportation, insurance - not your full lifestyle, because in a real emergency the streaming services and restaurant budget get cut anyway. That's why this calculator asks for spending by category instead of your income: two households earning the same salary can need very different funds. Multiply your essentials by the months of coverage that fit your situation (see the FAQ) and you have your target.
The timeline assumes your savings sit in a high-yield account earning 4% APY, compounded monthly - a realistic rate for online savings accounts as of 2026. Interest does a little of the work, but at this scale your monthly contribution matters far more than the rate, which is exactly why the fund belongs somewhere safe and liquid rather than invested.
Frequently asked questions
Do I need 3 months or 6 months of expenses?
Three months is reasonable for a stable dual-income household where both jobs are unlikely to disappear at once. Aim for six or more if your income is variable, you're self-employed, you're the sole earner, or your industry has long job searches.
Should I invest my emergency fund?
No. Emergencies don't wait for the market to recover - a fund you might need next month can't be exposed to a 20% drawdown. Keep it in a high-yield savings or money market account where it earns a real rate but stays liquid and principal-safe.
Should I pause investing to build my emergency fund?
A common approach: build one month of essentials first, before everything except any employer 401(k) match. After that starter fund, split new savings between investing and the fund until it's fully stocked, so you don't miss years of market growth while you build it.