guestimate

/ˈɡɛstəmət/
verb
  1. To estimate something using guesswork rather than precise data.
    • Can you guestimate how much paint we'll need for the wall?
    • She guestimated the distance to the next town as about ten miles.
    • We had to guestimate the cost because we didn't have a price list.
noun
  1. An estimate based on guesswork rather than exact calculation.
    • Without measuring, all we have is a guestimate of the room's size.
    • He gave a rough guestimate of the number of people at the concert.
    • My guestimate is that the project will take about three weeks.
Antonyms
What does "guestimate" mean? | whatsthatwordmean | whatsthatwordmean