ConverterCSS PT vs PX: Exact Conversion Without A DPI Assumption
Understand the exact CSS point-to-pixel relationship, reference pixels, device pixels, zoom, and why image or printer DPI is not an input to CSS conversion.
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Use the PT to PX tool for the direct action. This guide stays focused on the explanation, tradeoffs, mistakes, and reference context behind that task.
The CSS Relationship
CSS defines 1in as 96px and 1pt as 1/72in. Therefore 3pt equals exactly 4px, 1pt equals 4/3px, and 1px equals 3/4pt.
Use the point converters for CSS values. A finite decimal such as 1.3333 is a rounded display of 4/3, not the exact defining ratio.
Why DPI Is Not A Converter Setting
CSS px is a reference pixel. The browser maps CSS pixels to device pixels according to the viewing environment, zoom, and devicePixelRatio.
Raster-image resolution and printer dots per inch are separate workflows. Adding a DPI field would change the task from CSS length conversion into image or print sizing.
Reference Values
| CSS points | CSS pixels |
|---|---|
| 3pt | 4px |
| 12pt | 16px |
| 72pt | 96px |
| 75pt | 100px |
Related Tools
PX to PT
Translate CSS pixel lengths into CSS points. CSS absolute-length relationship; image or printer DPI is a separate problem.
CSSPX to REM
Convert a CSS pixel length into rem for a declared root size. 16px is a common preset, not a CSS standard constant.
CSSPX to EM
Convert a CSS pixel length into em using the property-relevant font-size context. 16px is a common preset, not a CSS standard constant.
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