Things to Remember:

Use a steel tape for accuracy
Measure Width and write it down, then Length and write it down
Measure to the nearest 1/8 inch
Do not take your own deductions. The factory will take necessary deductions and allowances.
Double check all measurements

NOTE: All measurements should come from measuring the window. If you measure your existing blinds, the measurements will be incorrect.

To find width

Measure the opening across the top where the headrail is to be installed from inside of jamb on left to inside of jamb on right. Record the exact measurement to 1/8″

To find length

Measure from the inside top of the opening on the left, at the center, and on the right to the sill; record the measurement to the nearest 1/8″ . Do not make any allowances: the factory will make all adjustments so the headrail will fit the opening properly and the vanes will clear the sill by 1/4″ to 1/2″.

To find width

Measure the width of the area to be covered at the place where the headrail will be installed to the nearest 1/8″. Blind should overlap opening at least 4″ on each side to ensure privacy.

To find length

Measure the length of the area to be covered and record to the nearest 1/8″. Blind should extend at least 3″ above and 3″ below opening or window molding. For ceiling-to-floor installations, make adequate allowance for carpeting. Specifying OB measurement means the factory makes no deduction allowances.

To find width

Measure the width of the area to be covered at the place where the headrail will be installed to the nearest 1/8″. Blind should overlap opening at least 4″ on each side to ensure privacy.

To find length

Measure the length of the area to be covered and record to the nearest 1/8″. Blind should extend at least 3″ above opening or window molding. For ceiling-to-floor installations, deduct 1/2″ for proper clearance. Specifying OB measurement means the factory makes no deductions allowances. To ensure easy access through the door and allow adequate overlap, consider the stack width.