Curtain Panel Calculator
SPORGAN HOME / THE CURTAIN STUDIO
Find the fullness.
Frame the room.
Use your rod span and the flat width of one curtain panel to estimate how many panels—or pairs—create the look you want.
How this curtain calculation works
The target flat fabric width equals the rod span plus your total return/overlap allowance, multiplied by the chosen fullness. The result rounds up to whole panels, then to an even number when equal sides are selected, and finally to complete retail pairs when curtains are sold in pairs. This may give slightly more fullness than the target. Use the panel’s advertised flat width, not its gathered width. Header construction, stack-back, fabric weight, pattern matching, lining and finished drop are outside this count; confirm product and installer guidance before ordering.
A practical plan, made around your measurements
How to use the Curtain Panel Calculator
Calculate curtain panels or pairs from rod width, flat panel width, fullness and overlap. Compare target and achieved fullness before ordering.
Your result: Panels or retail pairs with achieved fullness.
- 1
Measure the rod width across the space to cover.
- 2
Enter one flat panel width, desired fullness and overlap.
- 3
Choose singles or pairs and compare the result.
Frequently asked questions
What does fullness mean?
Fullness is total flat fabric width divided by the width you need to cover.
Does it calculate curtain length?
No. Measure length separately from your chosen heading position to the desired finish.