This calculator works out fold sections, pleat sizes, and rod pocket spacing positions for a standard Roman blind (Roman shade) — enter figures in cm or inches.

How to use this calculator

• Enter the following values in cms (or switch to Inches and fractions if you prefer).
  • Finished Blind Length
  • Headrail Allowance*
• Select a number of Fold Sections (must be an odd number)
• Press "Enter" to calculate
• If necessary change the number of Fold Sections and/or headrail allowance and recalculate until you find the best "Top Section length" for your blind.
• Varying the Headrail allowance will help you get the "Top Section" depth right. (Caution: If you make the headrail allowance too small the blind may not pull up properly * )
• Note the more fold sections you use the thicker the blind will be when pulled up. (using too many may cause problems, with the blind sticking outwards when pulled up)

* Please see our item Headrail allowance explained for more information on headrail allowances.