Chair: 51 to 58 inches
Twin (like the model shown): 56 to 65 inches
Full: 68 to 92 inches
Queen: 79 to 101 inches
- Innerspring mattresses have coils inside; the more coils, the better. The average is 345 coils; 644 is very good.
- Memory foam mattresses are better. They have no coils inside; the foam conforms to the user’s body.
- Air-coil mattresses are on a par with memory foam and feature an innerspring mattress with an air mattress built on top.
More: How to buy a conventional sofa