CSS Clamp() & Responsive Type Calculator
Turn a min and max font size into one clamp() value — fluid type that scales smoothly between breakpoints, no media queries needed.
About this tool
The CSS Clamp() & Responsive Type Calculator turns a minimum and maximum font size — each tied to a viewport width — into a single, production-ready clamp() value that scales smoothly in between, replacing a whole set of media queries with one line of CSS. Set your min/max sizes and viewport range, preview the result live, and copy the finished CSS.
How it works
- 1
Set your sizes
Enter a minimum and maximum font size, each tied to a viewport width.
- 2
Preview live
Drag the viewport slider to see the size scale in real time.
- 3
Formula is calculated
The tool converts your two points into one clamp() expression.
- 4
Copy the CSS
Paste the finished line directly into your stylesheet.
FREQUENTLY ASKED QUESTIONS
It's a linear interpolation between your two size/viewport pairs, expressed as a vw-based slope plus a fixed rem offset — the same math behind tools like Utopia, just wrapped in one field.
For font size, yes in most cases — one clamp() line scales smoothly across the whole range. You'd still use media queries for layout changes that aren't purely about scaling a number.
rem respects the user's browser font-size setting, which matters for accessibility — someone who's increased their default text size gets a proportionally bigger result too. You can switch to px output if you specifically need it.
The font size locks to your minimum or maximum value — clamp() only interpolates between the two breakpoints, it never goes smaller or larger than what you set.
Need more than a free tool?
If you're ready for a real project — website, branding, or something custom — let's talk.