If I'm stringing ~6mm pearls on a doubled strand, knotting between each pearl, probably 4*[finished length of strand] + 12". Scale that according to pearl width -- if I'm stringing pearls that are, say, 4mm wide, I'll add an additional 2*[finished length]*0.333... to account for the extra knots.
This is for my own personal reference, but feel free to benefit from it. I'm probably not totally wrong.
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