Convertissez les px en rem, em, pt, picas, pouces et mm selon la taille de police de la racine, celle du parent et les DPI. CSS fixe 1 in = 96 px = 72 pt.
Mis à jour Exemples vérifiés : 7
24px is 1.5rem with a 16 px root font and 96 pixels per inch.
| Unité | Valeur | Définition |
|---|---|---|
| Pixels (px) | 24px | 1 px |
| Points (pt) | 18pt | 1 pt = 1/72 in |
| Picas (pc) | 1.5pc | 1 pc = 12 pt = 1/6 in |
| Inches (in) | 0.25in | 1 in = DPI px |
| Centimetres (cm) | 0.635cm | 1 cm = 1/2.54 in |
| Millimetres (mm) | 6.35mm | 1 mm = 1/25.4 in |
| Quarter-millimetres (Q) | 25.4Q | 1 Q = 0.25 mm |
| em (parent font size) | 1.5em | 1 em = parent font size |
| rem (root font size) | 1.5rem | 1 rem = root font size |
| Percent of parent font size (%) | 150% | 100% = parent font size |
1 px
1 rem = root font size
CSS converts every length through pixels. The absolute units are fixed to each other: 1 in = 2.54 cm = 96 px = 72 pt = 6 pc, and 1 Q is a quarter of a millimetre. The font-relative units depend on the page: 1 rem is the root element's font size, and when you set font-size, 1 em (or 100%) is the parent's font size. The converter turns the value into pixels, then divides by the pixels in one target unit.
Front-end developers use it to turn a design's pixel sizes into rem, so text follows the reader's browser font setting: with the default 16 px root, 24 px is 1.5 rem. Print designers use the pixels-per-inch field instead; at 300 DPI a 10 mm logo needs about 118 pixels.
On screens a CSS inch is not a measured inch. Browsers anchor 96 px to a reference pixel of about 0.0213° of visual angle, so physical units match a ruler only in print.
Source de vérification : CSS Values 3 §6.1: 1rem = root font size (16 px browser default); 24 / 16 = 1.5
Source de vérification : CSS Values 3 §6.2: 1pt = 1/72 in, 1in = 96px; 12 × 96/72 = 16
Source de vérification : CSS Values 3 §6.2: 1in = 96px
Source de vérification : 1 rem = root font size (16 px); 1.5 × 16
16 pixels by default. One rem equals the font size of the root html element, and the major browsers set that to 16 px unless the reader changes the default font size or the stylesheet sets html { font-size }. Setting html { font-size: 62.5% } makes 1 rem = 10 px. The W3C CSS Values and Units specification defines rem; the 16 px figure is the browser default, not part of the specification.
Multiply pixels by 0.75; to go from points to pixels, multiply by 4/3 (about 1.333). Both factors follow from the W3C CSS rule 1 in = 96 px = 72 pt, so 1 px = 72/96 pt. Body text at 16 px is 12 pt, and 11 pt text from a word processor is about 14.67 px.
rem always refers to the root element's font size; em refers to the current element's font size, or to the parent's when used on font-size itself. So em compounds when nested: a list set to 1.2em inside another list set to 1.2em has text 1.44 times the outer size, while 1.2rem stays at 19.2 px with a 16 px root however deep it sits.
Use rem if text should follow the reader's browser font-size setting. Page zoom enlarges px and rem alike, but the default font-size preference changes only rem, em and percentage sizes. WCAG 2.1 success criterion 1.4.4 (level AA) requires text that can be resized to 200% without loss of content or function; browser zoom can meet it with px, and rem also honours the font-size preference.
Only in print. CSS defines 1 in as exactly 96 px, and on screens browsers anchor the pixel to the W3C reference pixel: one pixel of a 96 DPI screen seen from 28 in away, a visual angle of about 0.0213°. Phones are held closer and use smaller pixels, so a 96 px box measures well under an inch on most phones. Printers anchor to physical units, so 1 in prints as 25.4 mm.
La précision dépend de vos données et des hypothèses de la méthode. Le calcul décimal utilise 50 chiffres significatifs, mais les estimations, méthodes numériques et données sources peuvent être moins précises ; l’arrondi affiché ne supprime pas ces limites. Exemples résolus vérifiés à partir de sources indépendantes : 7. Par exemple, « 24 px in rem » est vérifié à l’aide de CSS Values 3 §6.1: 1rem = root font size (16 px browser default); 24 / 16 = 1.5.
W3C — CSS Values and Units Module Level 3, §6.2 absolute lengths and §6.1 font-relative lengths.
Ce calculateur comprend 7 exemples résolus dont les réponses proviennent de sources indépendantes. Ils font partie de la suite de tests et peuvent aussi être exécutés ici.