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Free Typography Tools

Responsive Font & CSS Clamp Calculator

Generate a fluid CSS clamp value between chosen type sizes and viewport widths.

What this tool does

Create fluid type that stops at deliberate limits.

The calculator derives a CSS clamp expression between chosen minimum and maximum sizes across two viewport widths.

The result grows linearly inside the range while preventing type from becoming smaller or larger than the specified limits.

Use the tool

Generate a responsive CSS clamp

Set type and viewport boundaries, preview the result, and copy the CSS.

Define a fluid type range

px
px
px
px

Fluid CSS value

font-size: clamp(18px, 8.000px + 3.125vw, 48px);

Fluid type follows the viewport.

How to use it

Three quick steps

  1. 1Choose minimum and maximum font sizes.
  2. 2Enter the viewport widths where scaling should begin and end.
  3. 3Copy the clamp value and test wrapping at real breakpoints.

Worked example

Scale a page heading

Grow from 18px at 320px to 48px at 1280px.

One clamp expression creates bounded fluid scaling between the two points.

FAQ

Questions about the responsive font calculator

Practical details about using the tool and understanding its result.

Keep working

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From one asset to the whole workflow

Carry responsive type decisions into implementation without losing their rationale.

Draftroom keeps projects, creative files, feedback, revisions, and approvals connected in one workspace.

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