A guesstimate is a guess or estimate, and it's usually not very accurate. When you guesstimate how much something costs, you're probably going to end up being wrong.
I guesstimated that the repair would cost $200, and it actually ended up costing $300.
She guesstimated that it would take her two hours to make the cake, but it actually took her three hours.
noun
an estimate that combines reasoning with guessing
Synonyms:
verb
estimate based on a calculation
1
They probably have a guesstimate.
2
At the least, this gives us a guesstimate.
3
I think that is a fair guesstimate.
4
That's too much of a guesstimate to be that useful.
5
The range is just a guesstimate by the developers.
6
They are not the first to guesstimate the release date.
7
I would guesstimate that not many do.
8
Those are guesstimate release date placeholders.
9
The official guesstimate of 200,000 is bang in the middle.