Recognised as Colour

#FF4240

#FF4240
Red
Dark
Nearest: Tomato

#FF4240 is a red with RGB values 255, 66, 64 and HSL 1°, 100%, 63%. It is a dark colour, so black text on it reaches 6.1:1 contrast (AA for normal text). The nearest named colour is Tomato.

Colour values

#FF4240#FF4240

HEX#FF4240

RGBrgb(255, 66, 64)

RGB (0–1)1, 0.2588, 0.251

RGB percentages100%, 25.9%, 25.1%

HSLhsl(0.6, 100%, 62.5%)

HSV / HSBhsv(0.6, 74.9%, 100%)

CMYK0%, 74.1%, 74.9%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,728,640

CSS custom property--colour: #FF4240;

Brightness & contrast

Relative luminance0.25527WCAG 2.x, 0 is black and 1 is white

Perceived brightness149.9 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 6.11:1

Contrast with white3.44:1WCAG normal text: Fail

Contrast with black6.11:1WCAG normal text: AA

Greyscale equivalent#6A6A6A

Inverted#00BDBF

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#7B703Eno red cones; affects about 1% of men; ΔE 75.4 from the original

Deuteranopia#AA9938no green cones; the most common form, about 1% of men; ΔE 75.6 from the original

Tritanopia#FF0044no blue cones; rare, and affects men and women equally; ΔE 13.7 from the original

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

Contrast with white, large text3.44:1WCAG large text: AA

Contrast with black, large text6.11:1WCAG large text: AAA

Named colours

Tomato · ΔE 13 Crimson · ΔE 15.6 Orange red · ΔE 24 Firebrick · ΔE 24.3 Red · ΔE 24.7 Coral · ΔE 26.5

Nearest named CSS colourTomato (#FF6347)ΔE 13, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#40FDFF

Analogous#FF409E, #FFA140

Triadic#40FF42, #4240FF

Split complementary#40FFA2, #409EFF

Tetradic#9EFF40, #40FDFF, #A140FF

Tints, shades & saturation

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

Lighter +40%#FFFFFF

Lighter +30%#FFD9D9

Lighter +20%#FFA7A6

Lighter +10%#FF7473

Darker −10%#FF100D

Darker −20%#D90200

Darker −30%#A60200

Darker −40%#730100

More saturated +25%#FF4240

Less saturated −25%#E75958

Channel breakdown

R255

G66

B64

Red255 (100%)

Green66 (25.9%)

Blue64 (25.1%)

Hue0.63°

Saturation (HSL)100%

Lightness62.55%

Dominant channelRed

Hex per channelR FF · G 42 · B 40

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF4240 (chemical formula)

Formula
80,570.518 g/mol
4241 atoms

FF4240 has a molar mass of 80,570.518 g/mol, made up of 4241 atoms across 1 element: 4241 × F.

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Molar mass

Molar mass80,570.518 g/mol

Total atoms per molecule4241

Distinct elements1

Mass of one molecule1.3379049 × 10^-19 g

Molecules per gram7.4743726 × 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 × 4241)80,570.518 g/mol, 100%

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Elements in this formula

Fluorine

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