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whats generally a good length to cut all your strings to?

generally when I cut my strings if it is a womans bracelet all i do is check if it fit well on my wrist but since i have a small wrist I make the bracelet a little bigger and samething for mens bracelets but in this case i use my husband wrist that way its easier for me to get an accurate measure that might fit others

120 cm per string, if you start with a buckle, is enough for most of the patterns.

Is 120 cm (=47 1/4 inch) the length of a string that will be used on both sides of the buckle?
Or should a string that will be used on both sides be cut to 240 cm?

That last one! 240 cm doubled up gives you 120 cm per string.

Personally,i add 18 centimeters for every string.So if i have ten strings,i make five strings of 180 cm,and fold them in half.Make sure that you always have around ten centimeters of string after the work,so you can braid better,or at least have some more string for finishing works

I usually use the length of my arm up to my shoulder, holding the string between thumb and index finger.

I guess I'm just lazy to bother measuring it up. ;-)