1. to estimate or approximate a figure or value roughly, without precise calculation
Usage: informal; present participle of ballpark

1. the act or process of making a rough estimate or approximation
Usage: informal; gerund form

Examples

• I'm ballparking the cost of the renovation at around $50,000.
• Without all the data, we're just ballparking these numbers.
• The ballparking of the project budget took only a few minutes.
• Can you give me a ballparking figure for how many people might attend?
• They were ballparking the timeline at six months, give or take.
• For now, we're ballparking expenses until we get the final quotes.