Sock Calculator 🧦
Calculate cast-on stitches for socks using foot circumference, gauge, and negative ease. Get heel and instep stitch counts in seconds.
How to Use the Sock Calculator
Measure foot circumference around the widest part — the ball of the foot just behind the toes. Standard adult circumferences are 20–24 cm (8–9.5 in).
Enter your gauge in stitches per 10 cm (or per 4 in). Sock gauge is typically measured over stockinette in the round on fingering-weight yarn: 32–36 sts per 10 cm is common.
The result is adjusted to the nearest multiple of 4 for even heel construction. Half the stitches go to the heel and half to the instep. Use the cast-on count as your leg cast-on for cuff-down socks.
FAQ
How many stitches do I cast on for socks?
Multiply foot circumference by gauge (stitches per cm) and apply 10% negative ease. Round to the nearest multiple of 4 for even heel construction. Typical adult sock cast-ons range from 60–72 stitches for fingering weight.
Why is negative ease important for socks?
Socks need 10% negative ease so the fabric stretches to grip the foot. Without negative ease, socks will slip and bunch. More than 15% ease may make the sock uncomfortably tight.
How many stitches go on the heel vs instep?
The heel flap and instep each use half the total cast-on stitches. For 64 stitches, that is 32 for the heel and 32 for the instep.
Where do I measure foot circumference?
Measure around the widest part of the foot, usually across the ball of the foot just behind the toes.