📏 DON'T WING YOUR TOILET INSTALLATION: THE MEASUREMENTS THAT MATTER Installing a toilet might seem like the easiest task in the world, until you realize it doesn’t fit or it’s totally uncomfortable. 😫 It’s not just a matter of "set and stick"; there’s precise ergonomics involved to ensure comfort and functionality. Here is your "cheat sheet" to avoid mistakes! The key measurement many ignore is the distance from the wall to the center of the drain: the standard is usually 30.5 cm (12 inches).