About CSS clamp() Font Size Generator
CSS clamp() Font Size Generator creates fluid typography that scales smoothly between minimum and maximum font sizes across a chosen viewport range.
Input is processed locally in your browser and is not sent to Navorika.
How the calculation works
Fluid slope
Slope = (maximum font size - minimum font size) ÷ (maximum viewport width - minimum viewport width).
Viewport coefficient
The slope is multiplied by 100 to convert the fluid portion into a vw coefficient.
Preferred value
The linear intercept is combined with the viewport coefficient to create the preferred middle value used by clamp().
Final CSS
font-size: clamp(minimum size, fluid preferred size, maximum size).
How to use this calculator
- 1Enter the minimum and maximum font sizes in pixels.
- 2Enter the viewport widths where fluid scaling should begin and end.
- 3Review the generated clamp() expression and live typography preview.
- 4Copy either the complete font-size declaration or only the clamp() value.
Understanding the result
Below the minimum viewport width, clamp() prevents the text from becoming smaller than the selected minimum font size.
Between the minimum and maximum viewport widths, the generated preferred value scales the font fluidly with viewport width.
Above the maximum viewport width, clamp() prevents the text from growing beyond the selected maximum size.
Important limitations
- The rem conversion assumes a 16px root font size.
- The generated value controls font size only; line height, letter spacing, container width, and font metrics can also affect typography.
- Minimum and maximum viewport widths must be different, and the maximum values must be greater than their corresponding minimum values.
Frequently asked questions
What does CSS clamp() do for font size?
It lets you define a minimum font size, a fluid preferred value, and a maximum font size in one CSS declaration.
Why use clamp() instead of media queries?
For many typography systems, clamp() allows text to scale continuously across viewport widths without requiring several breakpoint-specific font-size rules.
What does vw mean in the generated formula?
One vw equals one percent of the viewport width. The generated vw coefficient creates the fluid portion of the font-size calculation.
Does the generated font size have limits?
Yes. The first and third clamp() arguments enforce the minimum and maximum sizes.
Does Navorika send my settings to a server?
No. The calculation and preview run locally in your browser.
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