Question: what is standard size coffee filter?
Answer: #1 Size: Suitable for one cup coffeemakers (both electric and non-electric) #2 Size: Suitable for two-six cup electric coffeemakers/ one-two cup non-electric coffeemakers. #4 Size: Suitable for eight-ten cup coffeemakers (both electric and non-electric) #6 Size: Suitable for ten+ cup non electric coffeemakers.