Have never used a calculator . First count the number of runners on the track then take the tape leave 4 pockets and put the same number of hooks in every 8 pockets then leave 4 pockets and bingo you have your headed size. Never failed me
Melcurtains
Thanks Melcurtains - it's a bit more complicated for me because I don't have access to a roll of tape and I'm trying to work out the fabric required to quote for a job. Out of interest, what fullness does your method create please? I think Silent Gliss suggest either 2.1x or 2.3x .....
A couple of the tracks will be motorised - do you need to allow a little extra fabric to cover the motor?
I dont think you will go far wrong with 2.1x you really are in the hands of fabric width. If you allow say 1 more pocket you can always move the hooks either way ie 7 or 9 gap no one will notice If you have too much width you will have to cut it down. Good luck
Melcurtains
Thanks lizzy - I had used that document which mentioned their calculating spreadsheet which worked it out for you. I was curious to use it and check my workings. I now have a copy and it works well.
Out of interest, the document explains how to allow space for the motor on electric tracks which the calculator doesn't.
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