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CSS Unit Converter

Convert px, em, rem, vh, vw, pt, cm, mm, in, pc — all at once.

Value

Unit

Context Settings

Base Font (px)

Viewport Width (px)

Viewport Height (px)

Click any result card to copy its value.

About CSS Unit Converter

Designing for the web often involves fine-tuning visual properties until they look just right. CSS Unit Converter gives you an interactive playground to convert px, em, rem, vh, vw, pt, cm, mm, in, pc — all at once and instantly see the result. When you're happy with the output, copy the generated CSS code and paste it into your stylesheet — no guesswork needed.

How to Use

Adjust the visual controls Use sliders, color pickers, and dropdowns to customize the design properties. The preview updates in real time.

Fine-tune the result Experiment with different values until the design looks exactly the way you want it.

Copy the CSS code Click the Copy button to copy the generated CSS code. It's production-ready and includes vendor prefixes where needed.

Paste into your project Add the copied CSS to your stylesheet. The code works in all modern browsers without modification.

🔒 Privacy note: All processing happens locally in your browser. Your data is never sent to any server.

Why Use CSS Unit Converter?

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Visual Live Preview See your changes in real time as you adjust values. No more guessing what CSS properties will look like — experiment visually and copy the code.

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Production-Ready CSS The generated code is clean, optimized, and ready to paste directly into your stylesheet. Includes vendor prefixes where needed for cross-browser support.

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Faster Than Hand-Coding What takes 10 minutes of CSS trial-and-error takes 10 seconds with CSS Unit Converter. Adjust sliders and dropdowns instead of editing numbers in code.

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Learn CSS Visually Perfect for CSS beginners who want to understand how properties affect visual output. Experiment with values and see the relationship between code and design.

Frequently Asked Questions

em is relative to the font size of the parent element, while rem (root em) is always relative to the root element's font size (usually 16px). rem is more predictable for layouts.

vh and vw are percentages of the viewport dimensions. You can set the viewport width and height in the context settings to match your target device or design canvas.

CSS defines 1in = 96px exactly. So 1cm ≈ 37.795px and 1mm ≈ 3.7795px. These are CSS pixel equivalents, not physical screen measurements (which depend on DPI).