A twin bed typically measures 38 inches wide by 75 inches long (about 97 cm by 191 cm), making it the smallest standard mattress size designed for one person

. This size is ideal for children, teenagers, and adults under 6 feet tall, and it fits well in small bedrooms or limited spaces

. The overall area of a twin bed is approximately 19.79 square feet (1.85 square meters)

. The mattress thickness usually ranges from 9 to 12 inches (23 to 30 cm), depending on the model

. The twin bed is also commonly referred to as a single bed and is widely used in children's rooms, dormitories, and smaller living spaces

. In summary:

• Width: 38 inches (97 cm)
• Length: 75 inches (191 cm)
• Area: ~19.79 ft² (1.85 m²)
• Thickness: 9–12 inches (23–30 cm)

This size is perfect for single sleepers with limited space or budget considerations