Fullness describes how much flat fabric is used compared with the width the curtains cover when closed. It gives curtains their folds and affects privacy, drape and the overall character of the window. More fabric is not automatically better: a thick velvet and a fine voile behave very differently.
A practical starting point
Multiply the usable pole or track width by the planned fullness factor to estimate the combined flat width of the curtains. For a 200 cm track at 2 times fullness, the starting figure is 400 cm of flat fabric across both panels. This is a planning figure, not a cutting instruction. Side hems, heading construction, seams and the usable width of the fabric all change what must be purchased.
Choose fullness for the heading and cloth
Many gathered headings are planned around roughly 1.5 to 2.5 times fullness, depending on the fabric and the look required. A voile often needs more fabric to look generous; a bulky cloth may need less room to fold. Wave headings depend on compatible track components and an agreed wave spacing. Pinch pleats have fixed pleats, so their fabric requirement should be calculated to suit the exact pleat specification rather than an assumed universal ratio.
Think about pattern and stack-back
Large prints need extra length so motifs meet at seams and across panels. If the fabric is narrow, several drops may have to be joined. More fullness also means more fabric occupying wall space when open. Leave enough room at the sides so the stack does not cover too much glass.
Check before ordering
Ask for a calculation based on the actual track width, finished drop, fabric width, pattern repeat and chosen heading. Compare a sample hung in folds where possible. The best fullness is the one that lets this particular fabric hang cleanly on this particular window.
Practical checklist
- Confirm the usable track width
- Choose the heading before calculating fullness
- Assess the fabric weight and drape
- Allow for stack-back
- Include seams and pattern matching in the final order
Frequently asked questions
Is twice fullness suitable for every curtain?
No. It is a useful starting point, but the heading, fabric weight and desired appearance determine the final ratio.
Does more fullness always look better?
No. Excess fabric can make a heavy curtain bulky and difficult to stack, while a fine sheer may need extra fullness to look generous.
Is fullness the same as fabric quantity?
Fullness estimates flat curtain width. The purchase quantity must also include drop length, hems, seams, fabric width and pattern repeat.