To find the right size for inside mount blinds the most typical mounting method for any blind take three precise measurements for the width.
Standard vertical blind sizes.
We recommend adding 2 to 3 inches to each side.
Blind should overlap opening at least 4 on each side to ensure privacy.
78 in x 84 in item 924751 model 94933.
The width and length of the blind corresponds to standard window sizes.
From inner frame to inner frame at the top middle and bottom of the window noting the width to the nearest 1 8 inch.
Below is a heatmap of all vertical blinds sizes with the most common highlighted in red.
Those slats are typically 1 2 inch deep and hung within the window frame.
To maintain the maximum view allow adequate overlap and consider the stack width.
If you have trim around your window simply measure to the far edges of your trim from left to right.
Measure the width of the area to be covered at the place where the headrail will be installed to the nearest 1 8.
If your window has no trim around it measure a distance from point a to point b that includes any extra width you may desire for light gap coverage and privacy.