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Curtain Size Calculator
Get the perfect curtain width and length for your windows.
Key Features
- Fullness factor calculation
- Hem and header allowance
- Rod placement guide
How to Use
Measure your window width and height. Decide on the desired fullness and the height of the rod relative to the window frame.
Interactive Curtain Size Calculator
Calculation Formula & Logic
Fabric Width = Window Width × Fullness Factor; Length = Height + Rod Height + 3" hem allowance
*Calculations represent industry standard metrics used by licensed design consultants and construction specialists. Always incorporate structural layout constraints and material margins.
Expert Pro-Tips
- ✓Mount curtain rods 4 to 6 inches above the window casing to make your ceilings feel taller.
- ✓Measure window width including the trim or casing, not just the glass pane.
- ✓Use 2.5x fullness for a luxurious, heavy pleated drape; use 1.5x for sheer, breezy styles.
Frequently Asked Questions
Q: How far should a curtain rod extend past the window frame?
A: Extend the rod 4 to 6 inches beyond the window frame on each side to make the window feel wider and let in maximum light.
Q: Should curtains touch the floor?
A: Yes. For a clean, modern look, curtains should kiss the floor or hover up to 1/2 inch above. For a traditional look, puddle them by 1-2 inches.