How to measure a twin mattress?

You’ll need these simple tools: a measuring tape, a ruler, a piece of paper to take notes and a pencil. The bed needs to be stripped from all sheets, pad or protector. You need to measure from left to right (length and width) then use the ruler by laying it flat on top of the mattress then measure from that point to the bottom of the twin mattress. Don’t forget to write those numbers down on that piece of paper.