Using Hex Code: K
Using HTML Code: K
Using CSS Entity: K
Typed directly: K
Example: 273.15 K
How It Works
1. Hex:U+212A → K in HTML. The browser turns it into K.
2. Decimal: same code point as 8490 → K. Same result as hex.
3. CSS: use \212A in content (not an HTML entity). #point::after appends that K after the paragraph text.
4. Typed: in UTF-8 you can type K directly — same visual result when the font supports it.
Pitfalls & Tips
Common mistakes when working with the Kelvin Sign.
Named?
No named entity
HTML5 does not define a named entity for U+212A. Use numeric forms.
SI style
Never °K
Write K or K — not a degree sign with Kelvin. Degrees belong to °C and °F.
Compat
Plain K is fine
Many style guides prefer Latin capital K (U+004B) over U+212A for everyday text.
CSS vs HTML
Do not mix escapes
\212A belongs in CSS. K / K belong in HTML.
Semicolon
End references
Always finish with ; — write K, not K.
Fonts
Letterlike Symbols
Use fonts that include U+212A so the glyph is not missing or falling back oddly.
Compatibility
Browser Support
Kelvin Sign (U+212A) and its numeric entity forms (K, K, CSS \\212A) are supported in all mainstream browsers when the font includes Letterlike Symbols.
✓ Universal support
Kelvin Sign (K)
Encode with hex, decimal, or CSS escape — same character when the font supports U+212A.
100%Browser coverage
Google ChromeSupported
Yes
Microsoft EdgeSupported
Yes
Mozilla FirefoxSupported
Yes
Apple SafariSupported
Yes
OperaSupported
Yes
Internet ExplorerAll versions
Yes
U+212A / entitiesFull support
Bottom line: Prefer K or K in HTML when you need U+212A. Use \\212A only inside CSS content. For simple SI copy, plain K is often enough.
Remember
Key Takeaways
Unicode: Kelvin sign is U+212A (decimal 8490).
HTML: use K or K — no named entity.
CSS: use \212A inside content for generated text.
Style: use K/K, never °K.
One line:U+212A → K / K / CSS \212A.
Frequently Asked Questions
Use K (hex), K (decimal), or the CSS escape \212A in the content property. All render K when the font supports Letterlike Symbols. There is no named HTML entity.
U+212A (KELVIN SIGN). Hex 212A, decimal 8490. It belongs to the Letterlike Symbols block and is the SI unit symbol for thermodynamic temperature.
No. HTML5 does not define a named entity for U+212A. Use numeric references like K or K when you need an entity form.
Use it in physics, chemistry, and SI temperature content (e.g. 273.15 K). For many sites a plain capital K is enough and more compatible. Prefer numeric entities when encoding must be explicit.
HTML entities (K or K) go in markup. The CSS escape \212A is used in stylesheets (usually in the content property of ::before/::after). Both render K.
No. The kelvin unit is written as K (or K), not °K. Degree symbols belong with Celsius and Fahrenheit (°C, °F).
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Did you know?
Kelvin Sign is Unicode U+212A (decimal 8490) — KELVIN SIGN. HTML5 has no named entity — use K or K. For everyday SI text, a plain capital K (U+004B) is often preferred; do not write °K.
