When you're ordering furniture through Instacart, it's important to make sure you know the complete dimensions of the piece. The width and depth of the item will tell you how large its footprint is. The height lets you know how tall the piece stands. Measure the area where you plan to put the furniture. You might consider laying painter's tape on the floor to mark out the dimensions.  If you're purchasing a couch or chair, the height can give you an idea of how comfortable the item will be. Compare the new item's height to the height of another chair or couch in the home to get an idea of how it will feel. If you're purchasing a desk, it should be tall enough for you to slide your legs under while sitting in the chair that you plan to use with it.