IMPORTANT! This blind measures exactly 34" wide and is designed to fit inside a 34.5" wide window, following industry-standard sizing. A 1/2-inch deduction is applied to ensure proper bracket placement within the window frame for a secure fit. Measuring Guide: For width, measure your window horizontally at the top, middle, and bottom, recording the narrowest measurement. Choose the closest size, which will come with a 1/2-inch deduction for a proper fit. This blinds actual size is 34 inches to fit within a 34.5 inch window frame. For the length, measure the longest vertical distance from top to bottom.