Why three to six months is only a starting point, how essential expenses differ from lifestyle spending, and how to model your number.
Emergency cash is money you can reach in days. You want it so you do not sell investments at a bad time or take expensive debt when income drops.
Essential monthly spend
Add housing, food, insurance, minimum debt payments, and transport. Skip vacations and upgrades. Multiply by 3 to 6 months for a common range. Self-employed households often aim higher.
Where to keep it
High-yield savings beats checking for most people: liquid, insured where applicable, and separate from daily spending.