Recognised as Colour

#FF2931

#FF2931
Red
Dark
Nearest: Red

#FF2931 is a red with RGB values 255, 41, 49 and HSL 358°, 100%, 58%. It is a dark colour, so black text on it reaches 5.6:1 contrast (AA for normal text). The nearest named colour is Red.

Colour values

#FF2931#FF2931

HEX#FF2931

RGBrgb(255, 41, 49)

RGB (0–1)1, 0.1608, 0.1922

RGB percentages100%, 16.1%, 19.2%

HSLhsl(357.8, 100%, 58%)

HSV / HSBhsv(357.8, 83.9%, 100%)

CMYK0%, 83.9%, 80.8%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,722,225

CSS custom property--colour: #FF2931;

Brightness & contrast

Relative luminance0.23068WCAG 2.x, 0 is black and 1 is white

Perceived brightness143.9 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.61:1

Contrast with white3.74:1WCAG normal text: Fail

Contrast with black5.61:1WCAG normal text: AA

Greyscale equivalent#575757

Inverted#00D6CE

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#72672Eno red cones; affects about 1% of men; ΔE 82.2 from the original

Deuteranopia#A69425no green cones; the most common form, about 1% of men; ΔE 81.7 from the original

Tritanopia#FF0030no blue cones; rare, and affects men and women equally; ΔE 5.2 from the original

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

Contrast with white, large text3.74:1WCAG large text: AA

Contrast with black, large text5.61:1WCAG large text: AAA

Named colours

Red · ΔE 17.3 Crimson · ΔE 19.4 Tomato · ΔE 19.8 Orange red · ΔE 20.3 Firebrick · ΔE 28.7 Coral · ΔE 33

Nearest named CSS colourRed (#FF0000)ΔE 17.32, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#29FFF7

Analogous#FF299C, #FF8C29

Triadic#31FF29, #2931FF

Split complementary#29FF8C, #299CFF

Tetradic#9CFF29, #29FFF7, #8C29FF

Tints, shades & saturation

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

Lighter +40%#FFF5F5

Lighter +30%#FFC2C4

Lighter +20%#FF8F93

Lighter +10%#FF5C62

Darker −10%#F50009

Darker −20%#C20007

Darker −30%#8F0005

Darker −40%#5C0003

More saturated +25%#FF2931

Less saturated −25%#E4444A

Channel breakdown

R255

G41

B49

Red255 (100%)

Green41 (16.1%)

Blue49 (19.2%)

Hue357.76°

Saturation (HSL)100%

Lightness58.04%

Dominant channelRed

Hex per channelR FF · G 29 · B 31

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF2931 (chemical formula)

Formula
55,702.136 g/mol
2932 atoms

FF2931 has a molar mass of 55,702.136 g/mol, made up of 2932 atoms across 1 element: 2932 × F.

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Molar mass

Molar mass55,702.136 g/mol

Total atoms per molecule2932

Distinct elements1

Mass of one molecule9.2495573 × 10^-20 g

Molecules per gram1.0811328 × 10^19

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 × 2932)55,702.136 g/mol, 100%

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Elements in this formula

Fluorine

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