Start with your exposure
List the bills you must pay even when income stops, then consider the setbacks you would struggle to cover today. An urgent repair and several months without work are different problems. Your household, income stability, dependents and insurance affect the size of the reserve you need.
Give the money one job
Keep emergency savings accessible and separate from everyday spending. Money needed on short notice should not depend on selling a volatile investment at a good price. Check account fees, access conditions and the applicable deposit protections rather than selecting an account from its headline rate alone.
Build in stages
Pick an initial amount linked to a realistic expense, then automate a manageable contribution. If income varies, decide how much of each stronger month goes to the buffer. After a withdrawal, revisit your contribution and rebuild. A planned holiday or annual insurance bill belongs in its own savings category.
Try this today
Write down one plausible emergency, its estimated cost, your current reserve and the monthly amount you can add. Use the savings-goal calculator to see the gap. The appropriate target is personal; a generic number of months is a starting question, not a rule everyone can afford immediately.
Put the idea into numbers
Further reading
CFPB: Building an emergency fund
General education with a U.S. context. Illustrations are hypothetical. Account, tax and legal rules depend on your circumstances and location.