--- title: "CSS Unit Converter | px rem em vw vh Tool | XTRAW Tools" description: "Convert CSS units such as px, rem, em, vw, vh, and percentages with a free browser-based CSS unit converter." url: "https://xtraw.com/converters/unit-converters/css-unit-converter" date: "2026-05-20T22:49:15+00:00" language: "en-GB" --- [Travel Time Calculator](https://xtraw.com/converters/unit-converters/travel-time-calculator)[Bandwidth Converter](https://xtraw.com/converters/unit-converters/bandwidth-converter) [![CSS Unit Converter from XTRAW Tools](https://xtraw.com/images/virtuemart/product/xtraw-css-unit-converter-360x360.jpg)](https://xtraw.com/images/virtuemart/product/xtraw-css-unit-converter-360x360.jpg "CSS Unit Converter from XTRAW Tools") new [Back to: Unit Converters](https://xtraw.com/converters/unit-converters "Unit Converters") # CSS Unit Converter Convert CSS units such as px, rem, em, vw, vh, and percentages. Use this free browser-based css unit converter from XTRAW Tools. **CSS Unit Converter** helps you convert CSS units such as px, rem, em, vw, vh, and percentages. Use this free browser-based tool from XTRAW Tools to compare inputs, estimate results, and plan your next step. ## How to Use the CSS Unit Converter 1. Enter the required inputs shown in the form. 2. Review the dimensions, quantities, waste factor, text, code, pattern, or unit assumptions. 3. Run the tool, then adjust one input at a time to compare scenarios or check your estimate. ## What This Tool Helps With Convert CSS units such as px, rem, em, vw, vh, and percentages. It is designed for web designers, frontend developers, UI builders, students, and website owners who want a fast, browser-based estimate before relying on a contractor, engineer, supplier, code authority, developer library, or professional source. - Value: 16 - From Unit: px - To Unit: rem - Base Font Size: 16px ## Common Uses People use this tool when they need a quick way to estimate materials, preview content, test code, convert units, or plan a home, design, writing, or construction project. - **Developer Formatting:** Format, validate, preview, or convert developer-focused text and web inputs. - **Unit Conversion:** Convert CSS or measurement units for design, coding, and layout tasks. - **Data Conversion:** Convert code, style, Markdown, pattern, or text data into a useful output. ## Formula or Method Converts CSS units using selected base font size, parent size, viewport size, or container size assumptions. ## Example **Example inputs:** Value: 16; From Unit: px; To Unit: rem; Base Font Size: 16px **Example result:** Using the default inputs, 16px converts to 1rem. ## Related Tools - [Color Converter](https://xtraw.com/tools/color-converter) - [CSS Gradient Generator](https://xtraw.com/tools/css-gradient-generator) - [HTML Preview Tool](https://xtraw.com/tools/html-preview-tool) - [Markdown Preview](https://xtraw.com/tools/markdown-preview) - [Regex Tester](https://xtraw.com/tools/regex-tester) - [Length Conversion Calculator](https://xtraw.com/tools/length-conversion-calculator) ## CSS Unit Converter FAQ ### Is the CSS Unit Converter free? Yes. This tool is free to use on XTRAW Tools. ### Do I need to create an account? No. XTRAW tools are designed for browser-based use without requiring an account. ### Are the results exact? Results may be estimates depending on the inputs, formula, rounding, assumptions, and purpose of the tool. Always verify important results before relying on them. **Disclaimer:** This tool is provided for general informational, educational, and convenience purposes only. It is not legal, financial, medical, engineering, construction, building-code, safety, trade, or professional advice. 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