Precise measurements are essential for flawless roller blind installation. For inside recess blinds, measure width and drop at several points, using the smallest dimensions for a tight fit. For outside recess blinds, measure beyond the frame to eliminate light gaps and elevate style. Always use a metal tape measure, record in millimeters, and verify accuracy. Properly measured blinds enhance light control, privacy, and window aesthetics. Follow these tips for an easy measuring process and a stylish, tailored outcome.