noun / verb
guesstimate
GES-tih-mut/ˈɡestɪmət/
A rough estimate based partly on guesswork.
The person makes a guesstimate of the jar's beans by comparing a counted handful.

Etymology
Blending guess with estimate presents an approximation that openly depends on guesswork. The noun names the result of this informal judging rather than a firmly established calculation.
In context
if if for example we were to choose to fund one of these this year do you have any guesstimate of what that rate might be
More examples
- Without a guest list, we can only guesstimate how much food to buy.
- Her initial guesstimate of three hours turns out to be close.
- We guesstimated the crowd at about a thousand people.
Forms
guesstimate · guesstimates · guesstimated · guesstimating