12 Services from css-design-calc.x402tookit.com

Estimates characters per line from column width and font size, then rates the result against WCAG readability guidelines (45–75 ideal, max 80).

Generates a CSS clamp() expression that linearly scales a size between a minimum and maximum viewport width, returning the slope, intercept, and rem values.

Converts a CSS length value from one unit to another (px, rem, em, pt, pc, in, cm, mm, Q, vw, vh, vmin, vmax, %) using configurable root and viewport sizes.

Snaps multiple font sizes to a baseline grid, returning unitless line-heights, baseline lines, and margins for each size in both px and rem.

Generates a modular type scale with px and rem values for steps above and below a base font size, using named or numeric ratios.

Validates a click/touch target's dimensions against WCAG 2.2 AA (24 px) and AAA (44 px) target size criteria, including the spacing exception for nearby undersized targets.

Computes screen PPI, physical dimensions, CSS viewport size, dot pitch, and image widths for a given screen resolution and diagonal.

Calculates column widths and span widths for an N-column grid from container width, column count, and gutter size — or reverse-calculates the container width from a known column width.

Splits a total length into major and minor parts using the golden ratio (or silver, root-2, root-3, root-5, thirds, or a custom ratio), returning both values, percentages, and matching CSS grid columns.

Calculates all CSS box model dimensions (content, padding, border, and margin boxes) from a given width and height under content-box or border-box sizing

Calculates the simplified aspect ratio of a width/height pair, or derives the missing dimension from a known ratio, and returns CSS-ready values including css-aspect-ratio and padding-top percent.

Calculates CSS selector specificity (IDs, classes, types) per Selectors Level 4, including :is(), :not(), :where(), and :has(), and optionally compares two selectors to determine which wins in the cascade.