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How do I measure for Venetian Blinds?



Getting the right size is very important to the overall look and performance of your venetian blinds.

  • Sketch each of your windows and write each measurement on the sketch as you go
  • Measure in millimeters with a reliable metal tape measure
  • Follow the builders' rule of thumb - measure twice!

All Harvey Furnishings' ready made venetian blinds (both in store and online) have their measurements listed in Width x Drop.

For custom made venetian blinds, enter your measurements online, bring your measurements in store or arrange a free in home consultation to have our consultants measure up your windows for you.

For an Inside Mount


Measure the exact opening width across the inside of the window frame in millimetres at the top, middle and bottom of the window as pictured in positions A, B and C.


Measure the exact drop (or height) of the opening from the inside top of the window frame to the top of the sill in millimetres at the left, middle and right of the window as pictured in positions D, E and F.

measuring curtain width

For an Outside Mount


Measure the required width of the blind in millimetres (usually from the outside edge of the frame or architrave or wider if required).

NOTE:If the window has no architrave or frame add at least 40mm on each side of the opening.


Measure the required drop (or length) from the top of the architrave or frame.

At the top, a minimum of 50mm of frame/architrave is required for the fixing of the control brackets. If there is less than a 50mm frame, measure from a point 60mm above the window.

Where there is a protruding sill, measure to the top of the sill. If there is no protruding sill you may choose a point lower than the sill. Take this measurement at the left, middle and right side of the window as pictured in positions D, E and F.

measuring curtain width

Attachment: HarveyFurnishingsBlindMeasurementChart.pdf