What is Fullness ratio?
Total curtain width divided by window width — 1.5x, 2x or 2.5x.
Short answer
Ready-made 'pair' sizes assume a narrow window; measure and buy for 2x your rod width.
Fullness ratio when buying a curtains & blinds
Total curtain width divided by window width — 1.5x, 2x or 2.5x.
Why it matters: Fullness creates the folds. Flat panels look cheap and let light through the weave.
Look for: Ready-made 'pair' sizes assume a narrow window; measure and buy for 2x your rod width.
Full Curtains & Blinds buying guide