What '''style''' scarf, BGL, is it that you want to make?
One can just cross a warm scarf inside a coat, pull it (the scarf) up some and not have that style flap in the wind or snag on things while choreing, doing sports, etc.
Or it can be longer to be flipped around the neck once.....longer for twice.....it can be tied in a single knot, too. This determines the '''length'''. The formula is in the '''style'''.
How will fringe affect the length?
So, it's about the style that leads to the length. What style are you intending to make?
Take an expanse of yarn and put it around ones neck......measure....cross it.......measure......flip it around the neck.....measure.....give all of them some slack......measure........double flip around the neck.....measure.....knot it......measure.
As I craft that beginning chain, I make in on the length, I can verify if it's a nice length, determine the final style, etc. If it's too short, I can add to the ends - many times.
For the knit, I make it on the length and use the stitch gauge to determine inches. Because I put yarn around my neck, decided the style and measured I can run the math and how many to CO.
I make them on the short end, too and this can just go on until I'm satisfied with the length.
A soft tape measure is ideal for this work. Sewing kits have these. Pop it around ones neck, eh.......measure. If just your own, add a few inches for good measure.
Are you going to make this on the short or long end? Do short row work and you can always add to it or take away from it before it's an FO.
Boys and men necks are not that much thicker than a female's, so just add a few inches. A thick neck would mean add more inches. They won't be that much different as it's the thickness of the neck + the style that is considered; Gender isn't needed so much as the style and thickness of the neck - all will be different.
If you have scarves there in the house, measure them. Stores, too have scarves of various styles. I carry a tape measure on my key chain.
Flip that soft tape measure around your neck, eh? It's an invaluable tool.
Good luck, Sweetie and have a goodin'!
Some time ago, someone asked the same question - d... (