CSS Clamp Generator

Generate a fluid font-size clamp between two viewport widths. Minimum font size cannot exceed maximum.

Free to useNo sign-upRuns in your browser

Enter your details

Enter the inputs, then select Calculate.

Your result

Enter your details

Result will appear here

How CSS Clamp Generator works

Generate a fluid font-size clamp between two viewport widths.

Minimum font size cannot exceed maximum. Ending width must exceed starting width. Uses px plus vw; no browser preview or rem assumption.

Concept diagram for CSS Clamp Generator, showing minimum font size (px) input and the supported output. — Concept diagram; the three operation images are actual browser captures.

How to use CSS Clamp Generator

Follow the labelled inputs.

Enter minimum font size (px)

Replace the example with minimum font size (px). The field labels specify the expected format and units.

Calculate

CSS Clamp Generator: input and settings in the implemented browser tool — Actual local browser view. Open the image to read it at full size.

Check the remaining inputs

Set maximum font size (px), minimum viewport width (px), maximum viewport width (px). Minimum font size cannot exceed maximum.

Calculate

CSS Clamp Generator: tool result in the implemented browser tool — Actual local browser view. Open the image to read it at full size.

Run, review and save

Select Calculate. Review the generated font-size declaration, then copy it or download the result text.

Calculate

CSS Clamp Generator: review the details in the implemented browser tool — Actual local browser view. Open the image to read it at full size.

Examples and uses for CSS Clamp Generator

Check the supplied example

The starting example produces font-size: clamp(16px, 13.3333333333px + 0.833333333333vw, 24px);. Generate a fluid font-size clamp between two viewport widths.

Calculate

Developer input and configuration represented by document cards. — Prepare the input. Concept illustration.

Use your own inputs

Read the labels for minimum font size (px) and maximum font size (px), minimum viewport width (px), maximum viewport width (px). Minimum font size cannot exceed maximum.

Calculate

A developer example flowing from input to reviewed output. — Inspect an example. Concept illustration.

Record a reviewed result

Copy the generated font-size declaration into your working file. Minimum font size cannot exceed maximum.

Calculate

Developer output handed to the next stage of a workflow. — Use the result in your workflow. Concept illustration.

How to read the result

Read the generated font-size declaration with the input convention.

Generate a fluid font-size clamp between two viewport widths.

Minimum font size cannot exceed maximum. Ending width must exceed starting width. Uses px plus vw; no browser preview or rem assumption.

Calculate Calculate

A developer result reviewed alongside its source. — Review the returned output. Concept illustration.

Supported input and limits

Check the stated scope before you run it.

Minimum font size cannot exceed maximum. Ending width must exceed starting width. Uses px plus vw; no browser preview or rem assumption.

The input stays in this browser. Copy result and Download save the same displayed text.

Calculate Calculate

Input format and assumptions reviewed for a developer task. — Check format and assumptions. Concept illustration.

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CSS Clamp Generator: common questions

Answers about using CSS Clamp Generator and understanding its results.

What assumptions and input limits apply?

Minimum font size cannot exceed maximum. Ending width must exceed starting width. Uses px plus vw; no browser preview or rem assumption.

How can I save the output?

Use Copy result to copy the displayed text, or Download to save it as a text file. The tool runs in your browser and does not require an account.

Calculate with your input

Check the generated font-size declaration, then copy or download it.

Calculate