How the warp calculation works

The number of ends is the width in the reed times the sett. Warp length adds take-up, shrinkage, and loom waste to your finished length. Shrinkage and take-up are applied by division rather than a simple percentage add, which is the correct direction and matters most at larger percentages. Take-up, shrinkage, draw-in, and loom waste are yours to measure; the defaults are typical starting points for a balanced plain weave.