how wide is a twin mattress

A standard twin mattress is typically about 38 inches wide (around 96.5 cm).

Quick Scoop

• Most standard twin mattresses measure 38 inches in width.

• Length is usually 75 inches, but you asked just about width.

• Some brands may list 38–39 inches or allow about ±1 inch variation due to manufacturing tolerances.

So if you’re planning a frame or tight space, assume roughly 38 inches wide and give yourself an extra inch or so of clearance on each side.

Information gathered from public forums or data available on the internet and portrayed here.