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Curtain Size Calculator
Curtains are sized by the rod, not the window. For a soft gathered look you need panels totalling two to two-and-a-half times the rod width, and extending the rod 8-12 inches past each side stops the fabric blocking the glass.
How it works
Window width
Window height
Number of panels
Fullness
Hem finish
Rod height above window
Recommended rod width
Width per panel
Length per panel
Total fabric if panels were flat
Frequently asked questions
How do I use the Curtain Size Calculator?
Fill in the fields above โ the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.