23
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13
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23
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3
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The kebab-case Converter Calculator estimates the output string length when text is transformed into kebab-case (also known as dash-case, hyphen-case, or lisp-case). kebab-case is the standard naming convention for CSS class names, URL slugs, HTML data attributes, and command-line flags, making it one of the most visible conventions on the web.
In kebab-case, all letters are lowercase and words are separated by hyphens: 'primary navigation bar' becomes primary-navigation-bar. The name 'kebab-case' is a playful reference to the visual appearance of words skewered on a hyphen, like meat on a kebab stick. Despite its whimsical name, kebab-case is a serious and widely-adopted convention with specific technical advantages.
For URL design, kebab-case is the unambiguous standard recommended by Google, W3C, and SEO professionals. URLs like /blog/how-to-learn-python are more readable, more accessible, and better for search engine optimization than alternatives like /blog/howToLearnPython or /blog/how_to_learn_python. Google's own documentation states that hyphens in URLs are treated as word separators, while underscores are not, giving kebab-case a direct SEO advantage over snake_case in URL paths.
In CSS, kebab-case has been the universal standard since the language's inception. Every CSS property (font-size, background-color, border-radius, flex-direction) uses kebab-case. Class names in BEM methodology (Block-Element-Modifier) extend this convention: .navigation-bar__menu-item--active. Tailwind CSS utility classes also follow kebab-case: text-blue-500, max-w-screen-xl.
Command-line interfaces universally use kebab-case for long option flags: --output-dir, --max-retries, --no-cache. This convention is standardized in POSIX and GNU conventions and is expected by users of every modern CLI tool. Git commands like cherry-pick and stash-pop also use kebab-case.
This calculator provides instant length estimates for kebab-case output based on word count and average word length. It also shows the comparison with camelCase length, helping you understand the trade-offs between conventions. Since kebab-case has the same length as snake_case (both use a single-character separator), the length comparison applies to both.
One important limitation of kebab-case is that hyphens are interpreted as minus signs in most programming languages, making kebab-case identifiers invalid as variable names in JavaScript, Python, Java, and others. This is why kebab-case is restricted to contexts like CSS, URLs, HTML attributes, and CLI arguments where the identifier is treated as a string rather than parsed as code.
The kebab-case transformation replaces spaces with hyphens and lowercases all letters. The output length formula is identical to snake_case:
$$\text{kebab\_length} = \text{word\_count} \times \text{avg\_word\_length} + (\text{word\_count} - 1)$$
The (word_count - 1) term represents the hyphen separators between words. Compared to camelCase: $$\text{extra\_chars} = \text{word\_count} - 1$$
The URL-safe length equals the kebab-case length because hyphens, lowercase letters, and digits are all URL-safe characters that do not require percent-encoding.
The kebab-case Length shows the total output including hyphen separators. The URL-Safe Length confirms that kebab-case output requires no additional encoding for use in URLs (unlike spaces, which become %20, adding 2 characters each). The Characters More Than camelCase value shows the overhead of using separators vs. capitalization for word boundaries. For URL slugs, the readability benefits of kebab-case far outweigh the minor length increase.
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Results
'primary nav item' → 'primary-nav-item' = 17 chars, 2 more than camelCase
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6-word blog post title → 29-char URL slug like '/how-to-set-up-your-app'
kebab-case is a naming convention using all lowercase letters with words separated by hyphens: 'my-component-name'. It is named because the words look like they are skewered on a hyphen, resembling a kebab. Also called dash-case, hyphen-case, or lisp-case.
Google treats hyphens as word separators in URLs, improving SEO. URLs like '/learn-python-basics' are indexed as three separate words. Underscores are not treated as separators, so '/learn_python_basics' is indexed as one word. This gives kebab-case a direct SEO advantage.
Yes, exactly. Both conventions use a single-character separator (hyphen vs underscore) between words, producing identical output lengths. The choice between them is based on context and convention, not length.
Not in most programming languages. The hyphen is interpreted as a minus operator, so 'my-var' is parsed as 'my minus var'. kebab-case is limited to strings: CSS classes, URL paths, HTML attributes, and CLI flags. Use camelCase or snake_case for code identifiers.
CSS was designed with kebab-case from the start (1996). Properties like 'font-size' and 'background-color' established the pattern. The convention is deeply embedded in the language and cannot be changed without breaking backward compatibility.
BEM (Block Element Modifier) extends kebab-case with specific separators: Block__Element--Modifier. Example: 'search-form__input--disabled'. Blocks and elements use kebab-case internally, with double underscores and double hyphens as structural separators.
Insert a hyphen before each uppercase letter and lowercase everything. 'getUserProfile' becomes 'get-user-profile'. In JavaScript: str.replace(/([A-Z])/g, '-$1').toLowerCase(). Libraries like lodash provide kebabCase() functions.
Yes, completely. Hyphens, lowercase letters, and digits are all unreserved characters in URLs per RFC 3986. They require no percent-encoding, making kebab-case ideal for URL paths.
kebab-case is common for web project files: 'user-profile.tsx', 'api-client.js', 'auth-middleware.ts'. Angular CLI generates kebab-case file names by default. It avoids case-sensitivity issues across operating systems.
Negligibly. Longer CSS class names slightly increase file size, but gzip compression eliminates most of this overhead. Readability and maintainability benefits far outweigh any microscopic performance impact. Minifiers can shorten class names in production if needed.
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