• Measure the track or pole, not the window itself.
• For tracks: Measure the width of the track from end to end. If the track overlaps in the middle you must include the overlap.
• For poles: Measure the width of the pole between the decorative
  finials.

• For tracks: measure from the top of the track to allow it to be hidden by the curtains.
• For poles: measure from the underside of the curtain ring to allow the pole to be seen above the curtains.
• For poles where eyelets are selected. Measure from the top of the pole, we recommend you position your pole 10cms - 4 inches above the window.

These "Readymade" curtains are available in up to four different lengths and the length you select is totally down to your personal preference. By offering the drops that we do then almost all required lengths should be catered for.
The sizes you will see are all shown with the width first, then the length.