Curtain Rod Length Calculator
Work out curtain rod length from window width and side overhang.
Quick answer: enter your details below and click Calculate Rod Length — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
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Enter your details below.
How to use
- Measure the window width in centimetres.
- Enter the overhang you want on each side.
- Click Calculate Rod Length.
About this tool
Enter the window width and how far the rod should extend past each side, and the tool adds both overhangs to the width. The overhang lets curtains stack clear of the glass when open, which is the point of the extra length.
Frequently asked questions
Should the rod clear the frame?
Yes, mount it above the frame so curtains hang clear of the window and its handles.
What if the wall space is tight?
Use the largest overhang that fits, keeping both sides even where possible.