How many px is 1em

There is no restriction on which units can be used where. If a property accepts a value in px margin: 5px it also accepts a value in inches or centimeters margin: 1. But in general you would use a different set of units for display on screen than for printing on paper. In the past, CSS required that implementations display absolute units correctly even on computer screens. But as the number of incorrect implementations outnumbered correct ones and the situation didn't seem to improve, CSS abandoned that requirement in Currently, absolute units must work correctly only on printed output and on high-resolution devices.

CSS considers that printers, unlike screens, do not need to have different sizes for px in order to print sharp lines. In print media, a px thus not only has the same visual appearance from one device to another, but indeed it is measurably the same.

This is a pretty good reason not to ever use the ex unit if you want conformity. If the ex unit is used, it is impossible to compute the font-size through the ancestor chain. Mark Willis Mark Willis 3 3 silver badges 7 7 bronze badges. Hap Jewell Hap Jewell 41 1 1 bronze badge. Community Bot 1 1 1 silver badge. John Doe John Doe 3 3 silver badges 4 4 bronze badges.

EM is a unit of measurement proportional to the point size of a font. Peter O. Tom Vervoort Tom Vervoort 4 4 silver badges 11 11 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog.

Podcast Explaining the semiconductor shortage, and how it might end. Does ES6 make JavaScript frameworks obsolete? Featured on Meta. Now live: A fully responsive profile. Visit chat. Linked Related For example, one em in a point typeface is 16 points. Therefore, this unit is the same for all typefaces at a given point size. 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 are scalable in nature, so 2em would equal 24pt,. By using rem CSS units, components will change size when the root font size changes, giving developers another method of responsive design.

This means that each successive level of nesting does not keep getting larger. It is most difficult to awaken people from slow-wave sleep ; hence it is considered to be the deepest stage of sleep. Following a period of slow-wave sleep, however, EEG recordings show that the stages of sleep reverse to reach a quite different state called rapid eye movement, or REM, sleep. In general, each cycle moves sequentially through each stage of sleep: wake, light sleep, deep sleep, REM, and repeat.

Chronic sleep deprivation has been linked to greater risk of obesity, Type 2 Diabetes, dementia, depression, cardiovascular disease and cancer. There has also been research to show that insufficient REM sleep may cause migraines. Additionally, end-users can use hot keys to scale the text in all browsers. Many people have difficulty reading small text on a computer screen.

Choose your body font size in pixels px and out comes a complete pixel px to em conversion table, making elastic web design with CSS a snap. The once daunting challenge of converting pixels px to the elusive em has now been reduced to a booger eating pipsqueak.

Thanks, PXtoEM. After you select your body font size, go to "Get CSS" and there you go!