In a list that ranked 14 "The Big Bang Theory" actors from tallest to shortest, Johnny Galecki slotted into 9th position due to his 5 feet 5 inches height, per ScreenRant. While this means that the actor is taller than co-stars like Mayim Bialik and Simon Helberg, both of whom stand at 5 feet 4 inches; he is far from the height of Jim Parsons, who plays Sheldon Cooper and is Leonard's closest buddy and roommate. Parsons stands at 6 feet 1 inch (via Celeb Heights).

Interestingly, Galecki is also not as tall as Kaley Cuoco who plays his on-screen sweetheart on the sitcom. The actress is just an inch taller than Galecki at 5 feet 6 inches. That height difference had nothing on Leonard on the show, neither did it affect his chances in real life, as he and Cuoco dated for two years between 2007 and 2009, via Good Housekeeping.

"When we did the pilot, I was crushing so hard on Galecki, but he had a girlfriend," Cuoco reminisced on Dax Shepard's podcast, "Armchair Expert," in 2020. She then added that they would later "fall madly in love" with each other for two years before breaking up amicably. "We're closer today than we ever were," the actress said, via Us Weekly.

If you ever catch Galecki on TV looking taller than 5 feet 5 inches, just know it's as a result of padding the insoles of his shoes; a trick he used a lot while filming "The Big Bang Theory," per Add Height.