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.
Standard vertical blind sizes.
Measure the width of the area to be covered at the place where the headrail will be installed to the nearest 1 8.
Scroll over the image to view the sizes.
Project source room darkening vertical 3 5 in cordless white vinyl room darkening vertical blinds common.
From inner frame to inner frame at the top middle and bottom of the window noting the width to the nearest 1 8 inch.
78 in x 84 in item 924751 model 94933.
To find the right size for inside mount blinds the most typical mounting method for any blind take three precise measurements for the width.
The width and length of the blind corresponds to standard window sizes.
Those slats are typically 1 2 inch deep and hung within the window frame.
If you have trim around your window simply measure to the far edges of your trim from left to right.
We recommend adding 2 to 3 inches to each side.
Below is a heatmap of all vertical blinds sizes with the most common highlighted in red.