Recognised as Colour

#F20309

#F20309
Red
Dark
Nearest: Red

#F20309 is a red with RGB values 242, 3, 9 and HSL 358°, 98%, 48%. It is a dark colour, so black text on it reaches 4.8:1 contrast (AA for normal text). The nearest named colour is Red.

Colour values

#F20309#F20309

HEX#F20309

RGBrgb(242, 3, 9)

RGB (0–1)0.949, 0.0118, 0.0353

RGB percentages94.9%, 1.2%, 3.5%

HSLhsl(358.5, 97.6%, 48%)

HSV / HSBhsv(358.5, 98.8%, 94.9%)

CMYK0%, 98.8%, 96.3%, 5.1%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer15,860,489

CSS custom property--colour: #F20309;

Brightness & contrast

Relative luminance0.18962WCAG 2.x, 0 is black and 1 is white

Perceived brightness132.4 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 4.79:1

Contrast with white4.38:1WCAG normal text: Fail

Contrast with black4.79:1WCAG normal text: AA

Greyscale equivalent#363636

Inverted#0DFCF6

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#675A00no red cones; affects about 1% of men; ΔE 83 from the original

Deuteranopia#9B8900no green cones; the most common form, about 1% of men; ΔE 82.3 from the original

Tritanopia#FF0011no blue cones; rare, and affects men and women equally; ΔE 4.3 from the original

Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning

Contrast with white, large text4.38:1WCAG large text: AA

Contrast with black, large text4.79:1WCAG large text: AAA

Named colours

Red · ΔE 6.5 Orange red · ΔE 13.2 Tomato · ΔE 27.3 Crimson · ΔE 29.5 Firebrick · ΔE 34.3 Coral · ΔE 38.5

Nearest named CSS colourRed (#FF0000)ΔE 6.47, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

base +30°+90°+120°+180°+210°+240°+270°+330°

Complementary#03F2EC

Analogous#F20381, #F27403

Triadic#09F203, #0309F2

Split complementary#03F274, #0381F2

Tetradic#81F203, #03F2EC, #7403F2

Tints, shades & saturation

+40%+30%+20%+10%base -10%-20%-30%-40%

Lighter +40%#FEC3C4

Lighter +30%#FE9093

Lighter +20%#FD5E62

Lighter +10%#FC2C31

Darker −10%#C00207

Darker −20%#8D0205

Darker −30%#5B0103

Darker −40%#280102

More saturated +25%#F50006

Less saturated −25%#D32226

Channel breakdown

R242

Red242 (94.9%)

Green3 (1.2%)

Blue9 (3.5%)

Hue358.49°

Saturation (HSL)97.55%

Lightness48.04%

Dominant channelRed

Hex per channelR F2 · G 03 · B 09

Keep nerding

Every link below is a page Nerdulator can generate from what it already knows about this value.

Harmonies

Lighter and darker

Similar named colours

Also reads as

F20309 (chemical formula)

Formula
385,830.382 g/mol
20309 atoms

F20309 has a molar mass of 385,830.382 g/mol, made up of 20309 atoms across 1 element: 20309 × F.

Open this reading on its own page →

Molar mass

Molar mass385,830.382 g/mol

Total atoms per molecule20309

Distinct elements1

Mass of one molecule6.4068642 × 10^-19 g

Molecules per gram1.560826 × 10^18

Name

NameNot in the name tablea name cannot be worked out from a formula alone: isomers share formulas, and naming depends on bonding the formula does not show

Composition by mass

F100%

Fluorine (F × 20309)385,830.382 g/mol, 100%

Keep nerding

Every link below is a page Nerdulator can generate from what it already knows about this value.

Elements in this formula

Fluorine

Nerdulate something else

Nothing in mind? Surprise me · today’s page