Hat Size Converter
Find your hat size across every common sizing system: US, UK, European metric, cm and inch head circumference, and generic S/M/L/XL. Works for fitted baseball caps, dress hats, beanies, and cowboy hats. Measure the widest part of your head — above the eyebrows and over the ears.
How to Measure
Use a soft fabric measuring tape. Wrap it around your head about 1/2 inch above your eyebrows and ears — the widest part. Don't pull tight. The measurement in cm or inches is your circumference; look it up in the chart.
US vs UK Sizes
US and UK fitted hat sizes are typically the same number system (e.g., 7¼), but UK sizes are sometimes 1/8 smaller than US for the same head. When ordering online, always convert to cm circumference for accuracy.
FAQ
What's a 7⅜ hat in cm?
59 cm, or about 23¼\". Our table has the full breakdown.
Try Also
Why Use This Hat Size Converter?
The Hat Size Converter runs entirely in your browser, which means three things matter for you. First, it's instant — there's no server round-trip, no upload, no waiting on someone else's queue. Second, it's private — nothing you enter ever leaves your device, which makes it safe for sensitive numbers, draft copy, or files you don't want sitting on a third party's servers. Third, it's free forever — no signup, no email capture, no "basic vs. pro" upsell. Open the page, get the answer, close the tab.
Common Use Cases
- Everyday lookups when you need a fast, reliable answer without installing an app
- Cross-checking results from another tool or spreadsheet when accuracy matters
- Quick reference during work calls, school assignments, or planning sessions
- Sharing the link with a colleague or friend who needs the same answer
- Bookmarking for repeat tasks that come up regularly throughout the week
Privacy & How Your Data Is Handled
Every calculation and every transformation in the Hat Size Converter runs locally in your browser using standard JavaScript. We don't upload your input to any server, we don't log it, and we don't pass it to a third-party API. The tool works the same whether you're on a fast home connection or completely offline once the page has loaded. If you want to verify this for yourself, open your browser's network tab and run the tool — you won't see any outbound request carrying your data.
Frequently Asked Questions
Is the Hat Size Converter really free?
Yes. Every tool on ClickSolveTools is free with no signup, no email capture, no paywalled "pro" features, and no usage limits. We don't sell your data and we don't run ads inside the tool itself.
Does the Hat Size Converter work on my phone?
Yes. The Hat Size Converter is mobile-first and works in any modern browser on iOS, Android, Windows, Mac, Linux, and ChromeOS. Inputs are touch-friendly, the layout is fully responsive, and nothing requires a desktop-only feature to function.
Do I need to sign up or install anything?
No. There's no account, no extension, no app to download. Open the page in any browser, use the tool, and close the tab when you're done. Your usage isn't tied to a profile.
Is my data safe?
Everything runs locally in your browser. We don't transmit your inputs, calculations, or files to any server. You can use the tool with full confidence even for sensitive information.