Measure twice, make once
Component yarn planner
Combine measured yarn requirements by material and color, then round whole balls once for each group.
Start with the calculator. Formula, assumptions, and limits are available when you need them.
Before you use this tool
Enter each component’s base length before reserve and assign its material/color group. Components in one group share the same package facts; different colors stay in different groups.
The tool combines lengths and rounds packages once per group, so leftovers cannot cover a different color.
Method and limits
Formula and assumptions
For each group, add component lengths; multiply once by (1 + allowance ÷ 100); divide by label length and round up. Multiply whole balls by label length and mass. Enter lengths before allowance. Do not add a second reserve to an estimate that already includes one.
Worked example
Group A: 120 m + 80 m = 200 m; with 10% reserve, 220 m requires three 100 m/50 g balls. Group B: 60 m with 10% reserve requires one separate 100 m/50 g ball. The groups cannot share their rounding surplus.
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.