How many yards in 600 grams of bulky yarn?

650 grams is 22.945 ounces, which is approximately 23 ounces of yarn. Assuming 50 yards per ounce (according to a chart at Annie's Attic), you'd have 1147, or to round it off about 1150, yards in 650 grams.

To add to that, I have a skein of Red Heart Super Saver Worsted Weight yarn in hand. It says 7 oz. 198g, 364 yds, 333 m. Using that measurement, 650g would be about 1165 yards.

That said, not all worsted weight yarn weighs the same, so 650 grams of one brand may not be equal to another brand. If you are purchasing yarn for a particular project, I suggest buying more than you think you need to be sure you have enough of the same dye lot for your project.