ballpark estimate
An approximate estimate. Mary contacted several plumbers to get a ballpark estimate of the cost to fix her leaky toilet.
estimate the cost at (something)
To predict that something will cost a certain amount. Unfortunately, I would estimate the cost of these car repairs at $1,000.
estimate the cost at
(some amount) to approximate the cost of something at a particular amount. I estimate the cost at about one hundred dollars. The cost of repairing the car was estimated at over four thousand dollars!
a ballpark figure
or 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 figure
a number which is approximately correct: I know we haven’t really discussed costs yet, but can you give me a ballpark figure?