ballpark figure
(PW) approximate amount
When I asked the contractor how much it would be to remodel the kitchen, he gave me a ballpark figure.
(MW)
1 : a park in which ball games (as baseball
2 : a range (as of prices or views) within which comparison or compromise is possible
— in the ballpark : approximately correct
(freedictionary)
n.
1. A park or stadium in which ball games are played.
2. Slang The approximately proper range, as of possibilities or alternatives: Your estimate is high, but still in the ballpark.
adj.
1. Of, relating to, or used in a park or stadium: ballpark lights; ballpark seating.
2. Slang Being approximately proper in range: gave a ballpark estimate of future unit sales.