Put in your measurements and your blocked gauge. You get back every stitch count, every row count, and the exact rows to shape on.
Measure the foot that will wear the sock. Do not pull the tape tight. The calculator takes off the negative ease for you.
From your blocked swatch, in the fabric you plan to knit for the leg and foot.
Not eased. These are however tall you want them.
A sock is knit a little smaller than the foot so it stretches to fit. 10% is the usual starting point. Slippers can use less.
Your measurements with 10% negative ease applied.
Stitch counts at every point where the shape changes.
Row numbers count from the start of each section. Shaping always lands on a right side row, so every wrong side row is a plain purl row. Each shaping row changes one stitch at each side and moves the count by two.