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Curtain size calculator

Enter your window width and height. The calculator suggests a track width (window plus 175 mm each side), a drop from a track mounted 50 mm below the ceiling, and the price in each fabric.

Prices include GST and were checked on 27 October 2026. They come from the same calculator as the product pages.

Common questions

How wide should curtains be compared with the window?

The track should be 150–200 mm wider than the window on each side. The fabric is then 2–2.2 times the track width so it looks full when closed.

How high should a curtain track go?

As close to the ceiling or cornice as you can. It makes the room look taller and stops light spilling over the top.