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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.
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.
Related Tools
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.
A free online hat size calculator that works instantly in your browser. No registration, no limits — just enter your values and get results.
Características Principales
Free hat size calculator with instant results
No registration or signup required
Professional-grade hat size calculator tool
Works on all devices and browsers
Privacy-first: all processing happens in your browser
Unlimited usage with no restrictions
How to Use Hat Size Calculator
Enter Your Data
Input your values or data into the hat size calculator tool fields
Configure Options
Adjust any optional settings or parameters for your specific needs
Get Instant Results
The tool automatically calculates and displays results in real-time
Copy or Export
Copy the results to clipboard or use them directly in your project
Repeat as Needed
Run the tool again with different inputs — unlimited usage, completely free
Casos de Uso
Use hat size calculator for personal projects
Professional and academic applications
Quick reference and verification
Everyday productivity and convenience
Preguntas Frecuentes
Is the Hat Size Calculator free to use?
Yes, the Hat Size Calculator is completely free with no registration required. Use it as many times as you need.
Do I need to create an account?
No account needed. All tools work instantly in your browser without any signup or login.
Is my data safe?
Absolutely. All processing happens locally in your browser. Your data is never sent to any server.
Does the Hat Size Calculator work on mobile?
Yes, the tool is fully responsive and works on phones, tablets, and desktop computers.
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