Curtain Track Length Calculator | Window & Wall Coverage
Calculate the curtain track length needed to cover a window or opening, including side extensions and optional center overlap. Keep opening width, installation allowance and total track length separate.
Track length inputs
Curtain track requirement
Curtain track formula
Total track = track per opening × track count
Why extension is not a fixed number
Some installations prioritize compact wall coverage, while others need enough stack-back space to expose more of the window. The calculator therefore asks for the desired extension instead of assuming every opening needs the same projection.
Center overlap
A center overlap can matter for split-draw curtains where the two curtains meet in the middle. Single-panel installations may use zero instead.
Worked example
For a 2.0 m opening with 200 mm extensions on each side and 100 mm center overlap:
For six identical windows, total track is 6 × 2.5 = 15 m.
Frequently Asked Questions
Should I add side extension?
Add it when the curtain design requires track beyond the opening.
Does center overlap apply to every curtain?
No. It is mainly relevant to split-draw arrangements.
Does this choose the correct track profile?
No.
Can I calculate multiple windows?
Yes, for identical openings.