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Hat Size Calculator

Calculate cast-on, body rows, and crown decrease schedule for knitted hats. Supports beanie, slouchy, and beret styles from baby to adult XL.

Hat Size

Hat Style

Negative Ease (inches)

Gauge: Sts / 4"

Gauge: Rows / 4"

Head Circumference Size Chart

Size	Circumference
Baby (0–6 months)	~14"
Baby (6–12 months)	~16"
Toddler (1–3 years)	~18"
Child (4–10 years)	~19"
Teen / Small Adult	~20.5"
Adult S	~21"
Adult M	~22"
Adult L	~23"
Adult XL	~24"

How to Use This Calculator

Select a standard hat size or choose Custom and measure the head circumference.
Choose your hat style — beanie (fitted), slouchy, or beret each have different proportions.
Set negative ease (typically -1" to -2") so the hat stretches to fit snugly.
Enter your blocked swatch gauge (stitches and rows per 4 inches).
Click Calculate to get cast-on, row breakdown, and a crown decrease schedule.

Note: The crown decrease schedule is a guideline. Adjust decrease rates depending on your stitch pattern and how pointy or flat you want the top. Blocking can change the final size by up to 10%.

All calculations are performed locally in your browser. No data is sent to any server. Results are estimates — always swatch and measure for your specific yarn and tension.

Μια δωρεάν ηλεκτρονική αριθμομηχανή μεγέθους καπέλου που λειτουργεί άμεσα στο πρόγραμμα περιήγησής σας. Χωρίς εγγραφή, χωρίς όρια — απλώς εισαγάγετε τις τιμές σας και λάβετε αποτελέσματα.