What are some standard sizes for beds?

Standard bed sizes include twin, queen, full, king and California king. The smallest bed and mattress size is the twin mattress, which is also available in a twin extra long size, which is the same width as a standard twin but slightly longer.

The largest mattress and bed sizes are the king and California king. A king mattress is shorter but slightly wider than a California king. Some companies also manufacture a super king, which is larger than both a standard king and California king mattress, though this is not a common mattress size. The full mattress is wider than a twin, but both shorter and narrower than a queen mattress.