(the) numbers don't lie

cliché The numerical data or mathematical computations related to something show the incontestable truth about the situation. A: "Come on, I know our sales aren't where they were five years ago, but things aren't all that bad, right?" B: "The numbers don't lie, Jerry. If we keep going at this rate, the company will be bankrupt by the end of the year." A: "Wait, I owe you $20 for dinner, not $40!" B: "Everything you ordered is listed right here on the bill along with how much it cost. Numbers don't lie." I like Jack, but the numbers don't lie—he's not hitting well enough to be in the starting lineup every day.