How to Use This Calculator

1. Measure foot circumference at the widest point (ball of foot) and foot length from heel to longest toe.
2. Choose your desired sock height — ankle, quarter, crew, mid-calf, or knee-high.
3. Enter your gauge from a swatch knit in the round (stitches and rows per 4 inches).
4. Set negative ease (typically 0.5") so the sock stretches to fit without slipping.
5. Click Calculate for full construction details: cast-on, heel flap, gusset, foot length, and toe shaping.