about the size of it

that's about the size of it

That's the reality of the situation; that's an accurate summary. A: "So, you'll need to start looking for a new house then, huh?" B: "Yep, that's about the size of it." That's about the size of it—we only have the budget to keep one of you on the team.
See also: of, size
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

about the size of it

An approximately accurate version of a situation, event, or circumstance. It generally is used as a summing up: “That’s about the size of it.”
See also: of, size
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
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