Question: how many inches are mattresses?
Answer: The height of a standard mattress can vary, depending on who you ask. On average, the standard thickness of a mattress is 9 to 12 inches. 6 to 8 inches is considered slim or low, and less than 6 inches is very low. Mattresses 12 to 15 inches are high or thick, and those over 15” are very high.