Stonie was born on May 24, 1992, in San Jose, California. He is of Japanese, Czechoslovakian, and Lithuanian ancestry. He graduated from Evergreen Valley High School in San Jose, California. He weighs 134 pounds (58 kilograms) and is 5 feet, 8 inches tall (1.73 meters). His nickname, "Megatoad," is from the character Toad from the Super Mario franchise. Stonie has a younger brother named Morgan Stonie, who is oftentimes involved with the production of his challenges uploaded to his YouTube channel.