Buy yarn from the label, not a generic count
Convert length to grams and round each color to whole packages.
A yarn label that gives both length and net mass is enough to translate a yardage estimate into grams. Keep the length unit consistent: required meters divided by label meters, or required yards divided by label yards.
If a label gives 1,600 yards per 454 grams, then 1,000 yards corresponds to 283.75 grams. This arithmetic uses that yarn’s actual label. It does not infer thickness or an appropriate sett from a count such as 8/2.
Round colors separately
If blue needs 600 yards and white needs 100 yards, with 500-yard cones you need two blue cones and one white cone. Dividing the combined 700 yards by 500 and buying two cones would not cover the blue requirement.
Use the color allocation calculator to allocate ends, the weight calculator to translate the requirement, and the cone calculator once for each yarn or color.
Keep inventory honest
Use net yarn mass when weighing a partial cone; subtract the empty cone if you know its weight. Otherwise treat the remaining amount as uncertain and leave an appropriate reserve. A planned leftover is not the same as a measured leftover.
The NIST length definitions make the metric conversion exact: one yard is 0.9144 meter. Supplier labels and kitchen-scale readings may still be rounded.
Ready to use your measurements? Open the weaving planner.