Macros without Exercise

Hello everyone,

I am trying to drop about 20 pounds, but have not been doing exercise regularly. I know I should (and used to), but lately I just haven't been motivated.

With that said, I am trying to figure out how to target my caloric and macro intake, with the goal being of keeping muscle mass and losing fat.

I am a 5'7" male, about 170 lbs. Just trying to lean out a bit. Can anyone help point me in a direction?

Thanks in advance!