How use this Calculator

• Enter the following values in cms.
  • Finished Blind Length
  • Headrail Allowance*
  • Bottom flap depth
  • Cascade section depth
• Select a number of cascade sections
• Press "Enter" to calculate
• Varying the number of Cascade sections and the cascade increment will change the length of the blind in the up position and the top pleat size.
• Varying the Headrail allowance will also change the length of the blind in the up position and the top pleat size. (Caution: If you make the headrail allowance too small the blind may not pull up properly and if you make it too long the first fold may not have enough fabric to fold and sit right * )
• The ROD POCKET LAYOUT section below will produce a diagram showing the rod pocket positions

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

The bottom flap can be varied in length to your design requirements or made the same size as the cascade increment .