Length of Tzitzit Strings

The standard lengths for tzitzit strings, whether regular handspun tzitzit or niputz lishmah, is as follows:

• thin - 50 cm
• medium - 55 cm
• thick - 60 cm

That means when tied, from the first knot down to the tips will typically come out to 50 cm, etc.

Recently Mishkan Hatchelet started making a lot of different lengths. Normally various lengths are available for niputz lishmah tzitzit, as well, namely

• thin - 50 cm, 70 cm
• thick - 60 cm, 70 cm, 80 cm

All of the above can be found here.

Nowadays it seems many people are under the impression that longer strings are more kosher, but that's not the case! In fact, according to the Rishonim, your tzitzit should be one-third tied, two-thirds loose. With most all-white tzitzit tying customs (e.g. Ashkenazi, Sephardic, Chabad) as well as most techelet tzitzit tying customs (with the notable exception of HaRav Schachter's approach) that means the total length of the tzitzit is relatively short.