How big should an emergency fund be?
The usual advice is three to six months of essential expenses. Essentials are the bills you would still pay if your income stopped: housing, groceries, insurance, transportation and minimum debt payments. Streaming services and dining out are not essentials.
Aim toward six months or more if your income is irregular, you are the only earner, or you work in a field with slow hiring. Two steady incomes can often get by with three months.
Where to keep it
A high-yield savings account or money market fund keeps the money safe and reachable while it earns some interest. The calculator adds that interest monthly, so a higher APY shortens the timeline a little. Your deposits do most of the work.