What is the standard size of a chaise lounge chair?

Width: Measure the width of the chaise lounge. Measure inside the frame, between the arms, from left to right.
Height: Measure the height of section 1. This is the chaise lounge's back support (recline). Measure from the bottom of the section (at the break, where it connects to section 2) to the top.
Depth: Measure the depth of section 2. This dimension is indicated with the blue arrow in the above graphic. Measure from the top of the section to the bottom. If this is your final section, proceed to the next step.
Sections: Measure each of the depths of sections 3 and 4, if applicable. Measure from the top of the section to the bottom. When you've taken measurements of every section, proceed to the next step.