clamp() Calculator – CSS Responsive Font Text Size Calculator

clamp() Calculator for Fonts and Texts

The clamp() function in CSS is a way of setting responsive styles based on a range.

Enter your desired minimum and maximum font sizes (in px), along with the viewport (or container) sizes that define the range of scaling. The result will be a clamp() function you can use in CSS for fluid, responsive typography.

Calculate

(font size)
     |
  F  |        * (max size at max viewport)
  o  |       /
  n  |      /
  t  |     / <-- The line going up is determined by SLOPE and BASE
     |    /
  S  |   /
  i  |  /
  z  | /
  e  |/  *(min size at min viewport)
     +-------------------------- (viewport width)
        minViewport         maxViewport

This tool helps you create a special CSS font sizing rule using clamp(). By typing in minimum and maximum font sizes, and the smallest and largest viewport sizes, it will give you a clamp() formula. This formula makes your font size grow smoothly as the screen gets bigger, but never too small or too large.

How It Works:

1. Give It Numbers: You enter:
   • A small font size (for small screens)
   • A large font size (for big screens)
   • A small viewport width (when the font should be at its smallest)
   • A large viewport width (when the font should be at its largest)
   • A root font size (usually 16px)
2. Automatic Math: The tool calculates a slope and a base value. Don’t worry about what these mean too much; it just figures out how quickly and smoothly the font should get bigger.
3. Instant Results: It shows you a clamp() rule like this: clamp(min-rem, base-rem + slope-vw, max-rem) You can copy this and use it in your CSS. Your text will then grow smoothly between your chosen minimum and maximum sizes, depending on the screen width.

In short, this tool takes a few numbers from you and returns a ready-to-use CSS rule that keeps your text nicely responsive.

Browser Compatibility: https://developer.mozilla.org/en-US/docs/Web/CSS/clamp#browser_compatibility