Media-query-based font sizing jumps abruptly at breakpoints. Fluid typography using CSS clamp() scales continuously as the viewport resizes — no jumps, no extra breakpoints to maintain.
What Is the Fluid Typography Calculator?
Enter a minimum and maximum font size, and the viewport width range they should apply across, and get a ready-to-use clamp() value that interpolates linearly between them — the same math behind popular fluid-type tools like Utopia.
How to Use It
- Open the tool at /tools/fluid-typography-calculator.
- Set your min/max font sizes and min/max viewport widths.
- Copy the generated
clamp()CSS. - Resize your actual browser window to see the live preview scale.
Key Features
- Real linear-interpolation formula, not an approximation.
- Hard min/max clamping so the size never goes out of range.
- Live preview text that scales as you resize the browser.
- One-click copy of the final CSS declaration.
When to Use This Tool
- Building a fluid type system without dozens of media query breakpoints.
- Scaling headline or hero text smoothly across device sizes.
- Learning how the clamp() interpolation formula actually works, with the math shown transparently.
Try It Now
Open Fluid Typography Calculator directly, or press ⌘K and type the tool name from anywhere on the site.
Part of the CSS Tools collection on WebdevToolbox — free, browser-based developer tools with no login required.