A coupe is a car body style traditionally defined by a sloping rear roofline and two doors. The most critical feature is its fixed roof and a rear interior volume of less than 33 cubic feet, a definition established by the Society of Automotive Engineers (SAE). This design prioritizes style and a sporty driving feel over passenger and cargo space. However, modern usage has blurred these lines, with some four-door models now marketed as "coupes" due to their similar fastback profiles.
The key is the roofline. A coupe's roof slopes downward toward the rear, creating a sleek, aerodynamic profile often described as a "fastback." This design reduces rear headroom and trunk space but enhances the car's visual appeal and handling characteristics by lowering the center of gravity. While the two-door layout is classic, the official definition is based on interior volume. This is why you see models like the Mercedes-Benz CLS, a four-door sedan, called a "four-door coupe"—its roofline is so steeply raked that the rear interior space falls below the coupe threshold.
Historically, coupes were sportier derivatives of sedans. Today, they range from affordable compact cars to ultra-luxury grand tourers and high-performance supercars. The trade-off is always practicality; you choose a coupe for its style and driver-focused experience, not for its ability to carry rear passengers or luggage comfortably.
| Characteristic | Traditional Coupe | Modern "Four-Door Coupe" | Sedan |
|---|
| Number of Doors | Two | Four | Four |
| Roofline | Sloping, sporty | Sloping, sporty | More upright |
| Rear Interior Volume | Typically under 33 cu ft | Typically under 33 cu ft | Typically over 33 cu ft |
| Primary Focus | Style, Driving Dynamics | Style, Luxury | Passenger & Cargo Space |
| Common Examples | Ford Mustang, Chevrolet Camaro | Audi A7, BMW 4 Series Gran Coupe | Toyota Camry, Honda Accord |
