Hot Wheels cars are designed in 1:64 scale, according to multiple sources. This means that each car is 1/64th the size of the real-life version of the car. For example, if a real-life car is 16 feet long, a Hot Wheels car of the same model would be 3 inches long. However, its worth noting that Hot Wheels cars are not always exactly 1:64 scale, and are sometimes closer to a "3 inch" scale.