a ballpark figure
An approximate number; an estimate. Do you have a ballpark figure for the cost of the renovations? That's just a ballpark figure—they don't know exactly how many people will be attending the event.
a ballpark figureor
a ballpark estimate
A ballpark figure or a ballpark estimate is an approximate figure or quantity. Note: A ballpark is a park or stadium where baseball is played. But what are we talking about here — a few thousand, millions, two bucks? Give me a ballpark figure. I think just in a ballpark estimate — about 60-40. Sixty would support, 40 percent would be opposed.
a ˈballpark figurea number which is approximately correct: I know we haven’t really discussed costs yet, but can you give me a ballpark figure?
ballpark figure, a
A roughly accurate estimate, an educated guess. Coming from baseball, this expression rests in turn on in the ballpark, meaning within certain limits. Although both are generally applied to numerical estimates, neither appears to have anything to do with baseball scores.
See also: ballpark