Fluid Typography Calculator

Generate clamp() values for viewport-responsive font sizes.

About this tool

This tool auto-calculates clamp() values in one click. Three features: 1) Generate clamp() from min/max viewport and font sizes, 2) Useful for responsive and accessible font sizing, 3) Copy generated CSS directly. Ideal for responsive typography.

Tool interface 

  
 
 
    
 
 
 
Usage
 
     
  1. Enter min/max viewport width and font sizes
  2. clamp() recommended value is generated automatically
  3. Copy generated CSS and paste into your project
    4.  
 
 
 
When to use
 
Responsive typography that scales with viewport, avoiding manual clamp() math.
 
 
 
Examples
 
Output: clamp(1rem, 2.5vw + 0.5rem, 2rem)
 
  
 
FAQ
 
 
 
What is clamp()?
 
CSS function with min, preferred, and max values. Returns a value within that range. Great for responsive font sizes.
 
 
Benefits of Fluid Typography?
 
Smooth font scaling without many media queries. Balances readability and design consistency.
 
 
How to write clamp()?
 
clamp(min, preferred, max). Preferred uses vw or calc() for viewport. This tool auto-generates the formula.
 
 
Fluid Typography vs media queries?
 
Media queries change at breakpoints. Fluid Typography scales smoothly. Better for mid-size devices.
 
 
How to calculate clamp() preferred value?
 
Linear interpolation from min/max viewport and font sizes. This tool calculates it automatically.
 
 
Best practices for responsive font size?
 
Use clamp() with min/max. Use vw for smooth middle. Avoid extremes. This tool helps set the range.
 
 
Does Fluid Typography work on mobile?
 
Yes. Scales with viewport. Works on phone, tablet, desktop.
 
 
Browser support for clamp()?
 
Chrome, Firefox, Safari, Edge. IE11 not supported—add fallback like font-size: 1rem first.
 
 
Minimum font size for accessibility?
 
16px (1rem) for body text. Set clamp() min to 1rem typically.
 
 
How to use Fluid Typography calculator?
 
Enter min/max viewport width and font sizes. The tool outputs clamp() CSS to copy.
 
 
Is Fluid Typography Calculator free?
 
Free to use, no sign-up required.
 
 
Is data sent to a server?
 
Data stays on your device; we do not store it on our servers.
 
 
Supported browsers?
 
Tested on recent Chrome, Edge, Firefox, and Safari.
 
 
Offline use?
 
Core features work offline after the first load.
 
 
vs CLI or desktop apps?
 
Fluid Typography Calculator is an install-free online alternative to CLI or desktop apps.
 
 
When to use it?
 
Use it when: Responsive typography that scales with viewport, avoiding manual clamp() math.
 
 
Usage example?
 
Example: Output: clamp(1rem, 2.5vw + 0.5rem, 2rem)
 
 
Main features?
 
clamp() auto-calculation, Min/max width and font size, Copy CSS
 
 
How is this different from similar tools?
 
Fluid Typography Calculator runs in the browser with no install—ideal for quick checks before heavier CLI or IDE workflows.
 
 
Search keywords
 
フォント, レスポンシブ, clamp, CSS, フォントサイズ 可変
 
 
 
 
  
 
Basic workflow
 
     
  1. Enter min/max viewport width and font sizes
  2. clamp() recommended value is generated automatically
  3. Copy generated CSS and paste into your project
    4.  
 
 
Practical use cases
 
     
  • Responsive typography that scales with viewport, avoiding manual clamp() math.
  • This tool auto-calculates clamp() values in one click. Three features: 1) Generate clamp() from min/max viewport and font sizes, 2) Useful for responsive and accessible font sizing, 3) Copy generated CSS directly. Ideal for responsive typography.
  • clamp() auto-calculation
  • Min/max width and font size
    •  
 
 
 
Privacy & data handling
 
Data stays on your device; we do not store it on our servers.
 
 
 
Things to watch out for
 
     
  • Always double-check before pasting output into production
  • Try incognito if extensions break the page
  • Wait for processing on large inputs
    •  
 
 
 
Related learning content
  
  
 
 
Related tools
  
 
 
Tool set
 
 
 
Typography Set