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About Font Size Calculator
The Font Size Unit Converter & Fluid `clamp()` Generator translates typography dimensions across Pixels (`px`), Root EMs (`rem`), Parent EMs (`em`), Points (`pt`), Percentage (`%`), and viewport-based fluid `clamp()` responsive formulas.
How to Use Font Size Calculator
Step 1
Enter your font size in any supported unit (px, pt, rem, em).
Step 2
Review computed conversions in the cross-unit matrix.
Step 3
Toggle fluid typography mode to calculate viewport `clamp()` formulas.
Step 4
Click "Copy CSS".
Practical Use Cases for Font Size Calculator
Converting Print Points (`pt`) to Web Pixels (`px`)
Convert print document 12pt body text and 24pt headings into exact CSS 16px and 32px values based on standard 72pt/96px conversion factors.
Generating Responsive Fluid Typography with `clamp()`
Calculate seamless fluid font scaling (`font-size: clamp(1rem, 0.5rem + 2vw, 2rem)`) that smoothly adapts from mobile to 4K displays without media queries.
Input & Output Examples
Converting 12pt to px and rem
Points: `12pt` | Base: `16px`
Pixels: `16px` | rem: `1rem` | Formula: `12 * (96 / 72) = 16px`
Key Features & Performance
- ✓Multi-unit converter: `px`, `rem`, `em`, `pt`, `pc`, `%`, `vw`, `vh`.
- ✓Fluid typography engine: computes slope-intercept CSS `clamp()` expressions.
- ✓Configurable root base font size (default: 16px, or 10px 62.5% reset).
- ✓100% Client-Side memory execution.
- ✓1-Click Copy CSS snippet.
Key Terminology & Definitions
Point (`pt`) vs Pixel (`px`)
A typographical point is 1/72 of an inch, while a CSS pixel is 1/96 of an inch ($1\text{pt} = 1.333\text{px}$).
CSS `clamp(min, preferred, max)`
A CSS mathematical function that clamps a value between defined upper and lower bounds based on a dynamic preferred expression.