The right number depends on exposure
A household with one stable salary, low rent and family support may need a different reserve than a freelancer with variable income and dependents.
The goal is not to reach a perfect number. The goal is to buy time when something important goes wrong.
Start with one month
One month of essential expenses can prevent many small emergencies from becoming expensive debt.
Then build toward three
Three months gives most households more breathing room if income is interrupted or a major repair appears.
Keep it separate
Emergency money should not sit in the same place as holiday money, shopping money or planned spending. Separation protects the purpose.
Use it without shame
If a real emergency happens, the fund did its job. Rebuilding it is part of the system.