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Curtain Size Calculator

Three numbers decide whether custom curtains look custom: panel width, total fullness, and where the hem lands. Enter your rod width and rod-to-floor height below — in inches or centimeters — pick a fullness and panel count, and this calculator does the math the workroom would do: how wide each panel should be, how much total fabric your window wants, and the length to enter for a hem that floats, kisses the floor or puddles. When you're done, it tells you exactly what to enter in the product configurator. Measuring for the first time? The measuring guide walks the tape-measure part in five minutes.

Your Window

Between finials — measure the rod, not the window.

From the top of the rod straight down to the floor.

Not sure how wide your rod should be? The stack back calculator finds the rod width that keeps open curtains off the glass.

Fullness
Panels
2
Where should the hem land?

Common Questions

What is curtain fullness?

Fullness is the ratio of total fabric width to rod width — it's what makes curtains hang in folds instead of lying flat. At 1.5× a 60-inch rod gets 90 inches of fabric; at 2×, 120 inches. Two times is the designer default; sheers reward 2.5×; anything at 1× looks like a bedsheet on a wire.

Do I order the panel size or the window size?

The panel size — that's the number this calculator produces. Measure your rod, choose a fullness, divide across panels, and order each panel at its computed width. Ordering curtains at your window's width is the single most common sizing mistake, and it guarantees a flat, skimpy hang.

How many panels should a window have?

Two is the default for any window you'll actually open and close — one stack per side. Go to three or four past about 8 feet of rod so each panel stays light enough to pull with one hand, and use one panel only for narrow windows or stationary frames.

What if my computed panel width is over the 300 cm maximum?

Add a panel. Our workroom sews single panels up to 300 cm (118 in) wide; wider totals just split across more panels — same total fabric, same fullness, easier to glide. The calculator flags this automatically and tells you the minimum panel count that fits.

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