rem units are based on the font size of the html element. em units are based on the font size of the element they’re used on. Rem and em units are computed into pixel values by the browser, based on font sizes in your design. What’s the difference between REM and EM units? Px will be alright when page zooming (as opposed to text zooming) becomes the standard behaviour. You probably want to use em for font sizes until IE6 is gone (from your site). ![]() So use px when you want the size to be fixed and use rem / em when you want the size to be adaptive/ dynamic to the size of the system. You can find metric conversion tables for SI units, as well as English units, currency, and other data. You can do the reverse unit conversion from pt to em, or enter any two units below: provides an online conversion calculator for all types of measurement units. In an element with a 2in font, 1em thus means 2in. The em and ex units depend on the font and may be different for each element in the document. It’s better to use relative units, such as em, instead. Più articoli… What’s the difference between EM and ex units?īut the same on a mobile phone directly in front of your eyes looks big. 3 Points (pt): Points are traditionally used in print media (anything that is to be printed on paper, etc.). 2 Pixels (px): Pixels are fixed-size units that are used in screen media (i.e. Meet the Units 1 “Ems” (em): The “em” is a scalable unit that is used in web document media. What’s the difference between PX and Em in CSS? First and foremost, the current font-size is equal to 100% (i.e. Percent (%):The percent unit is much like the “em” unit, save for a few fundamental differences. Points are much like pixels, in that they are fixed-size units and cannot scale in size. What’s the difference between a percent and an em? So, by default 1em is equivalent to 16px, and 2em is equivalent to 32px. ‘s ancestors, then 1em will equal the default browser font-size, which is usually 16px. If a font-size has not been set on any of the (rem stands for “root em”.) Is 1em always 16px?īy extension, a font-size of 1em equals the computed font-size of the element on which it is used. To recap, the rem unit means “The root element’s font-size”. So each successive level of nesting gets progressively larger, as each has its font size set to 1.3em - 1.3 times its parent’s font size. To recap, the em unit means “my parent element’s font-size” in the case of typography. Whereas vw refers to the font-size relative to the viewport which changes from device to device. Should I use VW or em?Įm refers to the current font-size and scalable with respect to it. Its purpose is to express sizes that must be related to the x-height of a font. Declarations such as text-indent: 1.5em and margin: 1em are extremely common in CSS. ![]() Ems are scalable in nature, so 2em would equal 24pt. An em is equal to the current font-size, for instance, if the font-size of the document is 12pt, 1em is equal to 12pt. “Ems” (em): The “em” is a scalable unit that is used in web document media. The percent unit, on the other hand, is much more reliable, more consistent and more accessible for users. When you declare this style on element, the normal size will be respected by the browser.EM vs Percent In worst case scenario, the EM unit will make texts too small and nearly impossible to read. In addition, if you can notice, when you don't declare base font-size on your element, fonts just becomes bold or bigger than the normal. So if you say your base font-size is 16px, that means that when you want an element to have 64px width, you can assign 3rem instead (calculated as 64px / 16px = 3rem). Remember that rem is relative to your base font assigned to HTML element. So given you assinged a base font, when you set sizes on your, ,, ,, , you name it, you can use rem so that you'll have fluid responsive design. So what is a base font now? It is the font size you declare on tag. It adopts or shall we say, it is always be relative to the base font. A 16px font on your computer monitor might be displayed differently on a 16px font on your mobile phone. It's just that other devices may display it differently. If you say that this font is 16px, it is absolutely 16px wherever you put it. The difference between them is that px is a fix-size unit. They are units commonly used to measure lengths in CSS (Cascading Style Sheets). To know the difference between px (pixel) and rem (root ems), you need first to understand what they are what how they behave.įirst off, they are measurements used on screen media or screens on various devices.
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