The yardage is absolutely uneducated guesswork. The pattern callys for 3 (4, 4) 1-7/8 oz skeins main color and 5 (6-6) 1-7/8 oz skeins contrasting color ( I would have thought there would be more of the main color, but go figure). I’m guessing from the needle size that this would be a light sport or heavy fingering yarn, so I calculated for 170 yards per skein. Your yardage may vary.