How to Measure Windows for Blinds (Inside & Outside Mount)

Incorrect measurements are the #1 cause of blinds that don't fit right. This guide shows you exactly how to measure windows for inside and outside mount blinds — with common mistakes to avoid.

Quick Answer: For inside mount: measure the width at top, middle and bottom (use the smallest); measure the height on left, center, and right (use the longest). For outside mount: add 2–3 inches to each side for overlap and 2–4 inches above the frame. Always measure in inches to the nearest 1/8 inch. How to Measure Windows for Blinds The single most common cause of blind installation problems is incorrect measurements. A blind that's 1/4 inch too wide won't fit inside the window frame. A shade that's too short lets light in at the bottom. Getting measurements right the first time saves money, time, and frustration. Here's the complete guide. Inside Mount vs. Outside Mount: Choose First Insi

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