Basic bed sizes for all mattresses are standard in width and length of the bed. The most popular mattresses sizes are twin, full, queen and king sizes. Stick to the most popular size so you can readily find sheets, and other bedding accessories that properly fit the mattress.
When considering a bed size, think about your own personal sleeping habits and body size. A taller person would need an 80" long mattress. Look a the room where the bed will go and determine if it will fit in that space. Take the size of the mattress you choose and add a minimum 30" to each direction of the mattress for proper fit and walking room.
Common Mattress Size Dimensions
Twin size mattress - 38" wide x 75" long
Full size mattress - 53" wide x 75" long
Queen size mattress - 60" wide x 80" long
King size mattress - 78" wide x 80" long
California King size mattress - 72" wide x 84" long
Bedgoods.com offers bed sheets to fit all depths of mattresses.