For all the stains and spills that could happen on a dining chair, it's easy to see why having a slipcover is a no-brainer. You'll need to make 2 calculations to measure the proper slipcover: 1. Measure the height of the chair back, from just over the top of the chair legs to the top of the chair back. 2. Measure the width of the back chair, from one side to the other.