Billy Wagner thinks subjective opinion is keeping him out of the Baseball Hall of Fame.

Earlier this week, Wagner joined Jon Zaghloul on “Sports Talk Chicago,” and the former All-Star closer gave his thoughts on why has not been enshrined in Cooperstown.

“I don’t know,” he said. “You’re really asking something of me that I’m not comfortable with because my thought of Hall of Fame is all based on numbers. I can’t do nothing about the numbers that are out there. I don’t know how to build my case when the case is based on numbers … I don’t want to say that it’s a personal thing because you really can’t say I wasn’t good if my numbers are what they are.”

Wagner pitched for the Astros, Phillies, Mets, Red Sox and Braves from 1995-2010. He made seven All-Star games, had a 2.31 career ERA and a 0.998 WHIP and compiled 422 saves — good for sixth all-time. He believes these numbers speak for themselves.

“It’s not an unbiased vote if you’re voting and saying it’s numbers. It’s not,” Wagner said. “It’s obviously like/dislike. The only thing I can say is I’ve always been accountable for good, bad, indifferent as I took responsibility for my actions. I was always there at my locker to present the good and the bad with interviews. But, numbers wise there’s no case to be made for [not being in] the Hall of Fame if we’re gonna talk about numbers.

“If we’re gonna talk about sainthood, or how politically correct I was all the time in an interview, then I’m sure I shouldn’t be in there. But, I don’t think there was ever anyone who didn’t enjoy sitting at my locker waiting for an interview, because I was giving one. Whether you liked it or not, I was there.”

Earlier this year, The Post polled the 10 writers from the sports section who have Hall of Fame votes on who they’d be casting for and four voted for Wagner.

Wagner was asked about why he thought he hasn’t been voted in.

“I don’t get many West Coast votes, I don’t think, and maybe that’s because they didn’t see me that much. I don’t know. I really don’t know,” he said. “There’s New York voters who are guys who don’t vote for me. Whether you like me or don’t like me, the numbers support [me]. I know there’s a lot of people who say relievers or closers shouldn’t be in, but I’ve also seen the articles they’ve written when the guy blows the save.

“I think it’s kind of wishy-washy at times how we’re viewed. I don’t think the standards are the same for every person. I know there’s rumors spread about each player that are untrue. But most of the media, I don’t talk to. I don’t know most of the people that vote today. I don’t know if they know me. I don’t know if they saw me pitch. I don’t know what the particular reason is, but we all know that it’s not the numbers.”