Curtain Rod & Track Length Calculator
Enter your window width and how far to extend each side — get the right rod or track length, the number of brackets / supports you need, and mounting tips. Extend wider than the glass so open curtains let the full window breathe.
Your window
15–25 cm is typical
Extension is the part of the rod that reaches past the glass so the curtains stack beside the window, not over it. For wide spans, heavy fabric or motorised curtains, a track is steadier than a rod.
Decorative rod length
0 cm
about 5.1 ft · width 120 cm + 18 cm each side
Brackets / supports
3
2 ends + 1 intermediate
Extension used
18 cm
each side, past the glass
Centre overlap
10 cm
panels cross at the middle
Mount height tip
Hang high
10–15 cm above the frame, or to the ceiling
Clearance from wall · Allow 5–7 cm projection so curtains hang clear of the sill, handles or a radiator.
Finial allowance · Decorative finials add roughly 16 cm beyond the brackets — buy the rod by its covering length, not the total with finials.
Overlap · A centre-open pair needs a ~10 cm overlap so the two panels meet with no light gap; cut each panel half the track width plus the overlap.
Worth knowing
Extend the rod or track wider than you think — when the curtains are open, they should sit beside the window and reveal the full glass, not bunch over it. For heavy, lined, blackout or motorised curtains, choose a track over a rod: it carries weight more smoothly and won't sag over a wide span.
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DesignAI suggests the right hardware, hang height and curtain style for each room's light and proportions.
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