Converter · SOTA Fluid typography · no JS

CSS clamp() Calculator

Generate CSS clamp() functions for fluid typography and spacing that scales smoothly across viewport sizes. Replaces media-query breakpoint chains with a single calc-based CSS line.

Min size

Max size

Min viewport

Max viewport

Root font-size: px Output in rem (accessible)

Preview across viewports

CSS

How to Use CSS clamp() Calculator in 3 Steps

Configure. Enter your min and max sizes (e.g., 16px → 24px font-size) and min and max viewport widths (e.g., 360px → 1280px).
Process. The tool calculates the precise `clamp(min, preferred, max)` CSS using linear interpolation between the two viewport extremes.
Export. Copy the generated CSS line. Preview shows the scaled value across mobile (360px), tablet (768px), laptop (1280px), and desktop (1920px).

Why CSS clamp() Calculator on Pixlane

CSS clamp() replaces breakpoint-based typography with truly fluid scaling — a font-size that grows linearly from 16px at 360px viewport to 24px at 1280px, computed directly by the browser with no JavaScript. Pixlane's calculator does the math (min viewport × remUnit calculations) and generates the exact clamp() CSS with live preview across 5 device sizes.

No Media Queries — Replace 4+ breakpoint rules with one line. `font-size: clamp(1rem, 0.5rem + 1.25vw, 1.5rem)` covers the full range smoothly.
rem-Based Output — Output uses rem units for accessibility — respects user's base font-size preference. Critical for WCAG 1.4.4 text resize compliance.
Live Multi-Viewport Preview — See the computed value across 5 common device widths (360, 768, 1024, 1280, 1920). Catches scaling issues before deploy.
Reverse Engineering — Paste existing clamp() to see the min/max sizes and breakpoints — useful for inheriting legacy code or reading design system tokens.

Frequently Asked Questions

What does clamp() do?

`clamp(MIN, PREFERRED, MAX)` returns PREFERRED, but never less than MIN and never more than MAX. When PREFERRED uses `vw` units, it scales with the viewport — giving you fluid behavior clamped to sensible limits.

Why use rem instead of px?

rem scales with the user's browser base font-size (default 16px, but users can change it for accessibility). Using rem respects this preference; using px ignores it — violating WCAG 1.4.4. All modern design systems (Tailwind, Material, Apple HIG) recommend rem.

Can I use clamp() for padding and margins too?

Yes. The formula is the same — replace the font-size example with any CSS length property. Great for responsive section padding, card gutters, and margin-top rhythm.

Is this tool free?

Yes. CSS clamp() Calculator on Pixlane is completely free with no signup required.