WINDOW CURTAIN MEASURING GUIDE { vty. = arts rot sou CURTAIN ROD "hove te wow } Ideally: a curtain rod should be mounted 20 tod above the window tin. Curtains typically fall below the window sill. Ordains typicality Inaugurating typically reach the floor. puddle on the floor For proper fullness, fabric should measure approximately 2 to 3 times the width of your window.