PX to REM Converter
Use this free tool to easily convert pixels to REM and REM to pixels. Simply remove the default values and start converting. The base font size is typically set to 16px in most browsers. If you’re unsure, it’s best to leave it as is to ensure accurate results.
Calculation based on a root font-size of 16 pixels.
| Pixels | REM |
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| REM | Pixels |
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Frequently Asked Questions
The PX to REM Converter is a free online tool that lets you quickly convert pixel values to REM units and vice versa. This helps maintain consistent typography and layout scaling, especially for responsive designs. The default base font size used is 16px, which matches most browser settings.
REM (Root EM) is a CSS unit relative to the root element’s font size. For example, if the root font size is 16px, 1rem = 16px. REM scales automatically when the root font size changes, making it ideal for responsive typography and flexible layouts.
PX (Pixel) is an absolute unit in CSS representing a single dot on the screen. Pixels are fixed in size and do not scale with the browser’s font settings. PX is ideal for elements that need precise control, like borders or icons, but less flexible for responsive layouts.
REM units offer better accessibility and scalability compared to pixels. They adjust based on the root font size, making your website more responsive across devices and user settings. Pixels remain fixed, which can limit flexibility in responsive designs.
The converter uses a default root font size of 16px. It calculates REM values by dividing pixels by 16 and calculates PX values by multiplying REM by 16. These calculations are updated instantly as you type, and the tool also generates conversion tables for reference.
Yes! The tool can convert any positive value, and the built-in tables include pixel values up to 500px and REM values up to 50rem, providing quick references for a wide range of design needs.
The swap button allows you to quickly switch focus between the PX and REM input fields. This makes it easy to enter a value in one unit and convert it to the other without manually selecting the other field.
Yes. The conversion is precise up to 4 decimal places, ensuring accurate sizing in your CSS. It is based on the standard formula: rem = px / 16 and px = rem × 16.
Yes. REM values are relative to the root font size. If your CSS sets a different root size (e.g., 20px), then 1rem = 20px, and the converted values will differ. The converter uses 16px by default, which is standard in most browsers.
Absolutely. The converter includes PX to REM and REM to PX tables. These allow you to quickly look up conversions without manually typing values, making design work faster and more efficient.