About Accessible Font Size & Fluid Typography Calculator
Generate accessible typography hierarchies conforming to WCAG SC 1.4.4. Includes modular ratio scales, responsive CSS clamp() formulas, and optical viewing distance minimums.
Key Capabilities & Features
- Modular scale generator (Major Third, Golden Ratio, etc.)
- Responsive CSS clamp(min, preferred, max) builder
- WCAG 1.4.4 200% text magnification simulation
- Optical viewing distance minimums (phone, desktop, TV)
- Instant CSS snippet copy
How to Use Accessible Font Size & Fluid Typography Calculator
Set Base Font
Choose your body font size in pixels (default 16px).
Select Scale Ratio
Choose a modular scale (e.g. Major Third 1.250 or Perfect Fourth 1.333).
Export Fluid CSS
Copy generated clamp() CSS rules and verify 200% zoom reflow.
Privacy & In-Browser Execution Guarantee
100% in-browser calculations. Zero external telemetry.
Frequently Asked Questions
What does WCAG 1.4.4 require for font sizing?
WCAG 2.1 SC 1.4.4 requires that text can be resized without assistive technology up to 200 percent without loss of content or functionality.
Why should I use rem instead of px in CSS?
Using rem units respects the user browser default font preferences and accessibility zoom settings, whereas hardcoded px values can override user zoom.
How does CSS clamp() work for typography?
clamp(min, preferred, max) sets a minimum size on small screens, scales smoothly using viewport width (vw), and stops at a maximum cap on larger monitors.