Measure twice, make once
Yarn & skein planner
Convert required length into whole balls or skeins with a chosen allowance.
Start with the calculator. Formula, assumptions, and limits are available when you need them.
Before you use this tool
Choose length when the requirement is in metres, or weight when it is in grams. Use the matching amount printed on one ball’s label.
Apply reserve only if the requirement does not already include it. Whole-ball rounding explains why purchased yarn exceeds the estimated use.
Method and limits
Formula and assumptions
Choose length or weight. The required amount plus reserve is divided by the matching label amount per ball and rounded up to a whole purchase unit. Buy the whole project from one dye lot when color consistency matters.
Worked example
Example: 850 m plus 10% allowance, at 200 m per ball, requires 5 balls.
Limits and rounding
Results are planning estimates from the values entered. Displayed decimals are rounded for craft use; whole materials and repeats round up where the method says so. Confirm gauge, material behavior, construction, and finished measurements before committing supplies.