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guesstimate

/ˈɡɛstɪmeɪt/ · gues·tis·mate
noun
  1. An estimate that is hardly any better than a guess, often because it is based on insufficient or unreliable data. The project manager made a guesstimate of the construction time, but it turned out to be way off.
  2. A rough estimate or approximation. The guesstimate of the population was later confirmed by the official census.
verb
  1. To make a guesstimate. The team had to guesstimate the cost of the materials before placing the order.
  2. To make a guesstimate of a specific quantity. The engineer guesstimated the weight of the cargo, but it ended up being heavier than expected.
Did you know? The word 'guesstimate' has become a common term in business and engineering, where precise estimates are crucial, but sometimes impossible to obtain.
Written by Lexi Wordsworth, Dictionary Editor 1 lookups Added Aug 13, 2026