Recognised as Colour

#F43531

#F43531
Red
Dark
Nearest: Tomato

#F43531 is a red with RGB values 244, 53, 49 and HSL 1°, 90%, 57%. It is a dark colour, so black text on it reaches 5.4:1 contrast (AA for normal text). The nearest named colour is Tomato.

Colour values

#F43531#F43531

HEX#F43531

RGBrgb(244, 53, 49)

RGB (0–1)0.9569, 0.2078, 0.1922

RGB percentages95.7%, 20.8%, 19.2%

HSLhsl(1.2, 89.9%, 57.5%)

HSV / HSBhsv(1.2, 79.9%, 95.7%)

CMYK0%, 78.3%, 79.9%, 4.3%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,004,401

CSS custom property--colour: #F43531;

Brightness & contrast

Relative luminance0.22001WCAG 2.x, 0 is black and 1 is white

Perceived brightness140.4 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.4:1

Contrast with white3.89:1WCAG normal text: Fail

Contrast with black5.4:1WCAG normal text: AA

Greyscale equivalent#5D5D5D

Inverted#0BCACE

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#72672Eno red cones; affects about 1% of men; ΔE 76 from the original

Deuteranopia#A19027no green cones; the most common form, about 1% of men; ΔE 75.8 from the original

Tritanopia#FF0037no blue cones; rare, and affects men and women equally; ΔE 11.2 from the original

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

Contrast with white, large text3.89:1WCAG large text: AA

Contrast with black, large text5.4:1WCAG large text: AAA

Named colours

Tomato · ΔE 14.9 Crimson · ΔE 16.7 Orange red · ΔE 20.7 Red · ΔE 21 Firebrick · ΔE 23.4 Coral · ΔE 28.1

Nearest named CSS colourTomato (#FF6347)ΔE 14.91, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#31F0F4

Analogous#F4318F, #F49731

Triadic#31F435, #3531F4

Split complementary#31F497, #318EF4

Tetradic#8FF431, #31F0F4, #9731F4

Tints, shades & saturation

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

Lighter +40%#FEF3F3

Lighter +30%#FCC3C2

Lighter +20%#F99492

Lighter +10%#F76461

Darker −10%#E6110C

Darker −20%#B50D0A

Darker −30%#850A07

Darker −40%#540605

More saturated +25%#FF2A26

Less saturated −25%#D94F4C

Channel breakdown

R244

G53

B49

Red244 (95.7%)

Green53 (20.8%)

Blue49 (19.2%)

Hue1.23°

Saturation (HSL)89.86%

Lightness57.45%

Dominant channelRed

Hex per channelR F4 · G 35 · B 31

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Harmonies

Lighter and darker

Similar named colours

Also reads as

F43531 (chemical formula)

Formula
827,001.938 g/mol
43531 atoms

F43531 has a molar mass of 827,001.938 g/mol, made up of 43531 atoms across 1 element: 43531 × F.

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Molar mass

Molar mass827,001.938 g/mol

Total atoms per molecule43531

Distinct elements1

Mass of one molecule1.373269 × 10^-18 g

Molecules per gram7.2818944 × 10^17

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 × 43531)827,001.938 g/mol, 100%

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Elements in this formula

Fluorine

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