“Technically, a compact car has 100 to 109 cubic feet of combined passenger and cargo volume, and it also needs to be 161 to 187 inches long.
A midsize car can have anywhere from 110 to 120 cubic feet of passenger and cargo volume. It also cannot be longer than 196.8 inches.
Any vehicle longer than 196.8 inches or that has more than 120 cubic feet of combined passenger and cargo volume is considered a large or full-size car.
A compact car is typically a good choice if you need a vehicle for the daily commute, while a midsize car makes for a better family vehicle. Full-size cars are really only a good choice if you need a lot of space.