Curtain Panel Calculator

in
in
Width of each individual curtain panel.
1.5 = light; 2 = standard; 2.5 = full/luxurious.
Everyday Life

Calculate how many curtain panels you need to properly cover a window with full, even coverage.

Formula

Panels = ⌈(window width × fullness) ÷ panel width⌉, rounded to even
  • Always round up to even number for a balanced, symmetric look.
  • Standard panel width is 54 in (137 cm).
  • Fullness: 1.5× = sheer, 2× = standard, 2.5× = full/dramatic.

60-inch window, 54-inch panels, 2× fullness

Inputs
  • Window Width: 60 in
  • Panel Width: 54 in
  • Fullness Factor: 2

Total fabric needed = 60×2 = 120 in. 120/54 = 2.22 → 3 panels → round to 4 for symmetry.

Frequently asked questions

Why round to an even number?
Pairs of panels (one on each side) look symmetrical and professional.
What width are standard curtain panels?
Most ready-made panels are 54 inches (137 cm) wide per panel.
What fullness should I use?
2× the window width is the most common; go 2.5× for a very full, luxurious look.
Can I use 2 panels for wide windows?
For windows over 84 in, 4 panels are usually recommended for proper coverage.