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PRIVATE, FREE BROWSER UTILITY

Responsive Font & Spacing Size Calculator

Calculate a smooth font-size or spacing rule between two screen widths.

✓ Files remain on your device · No sign-up

Create scalable sizes without guessing.

Get a useful result in seconds. Processing happens on this device.

How to use this tool

Enter the minimum and maximum screen widths and sizes, then copy the result.

Before you begin

Assumes the usual 16-pixel base when generating the formula.

Why keep files local?

The tool reads the input with your browser and processes it on your device. It does not send your file to a Workpico conversion API. If you share a result by copying or downloading it, you control what happens next.