Recognised as Colour

#FF663C

#FF663C
Red
Dark
Nearest: Tomato

#FF663C is a red with RGB values 255, 102, 60 and HSL 13°, 100%, 62%. It is a dark colour, so black text on it reaches 7.2:1 contrast (AAA for normal text). The nearest named colour is Tomato.

Colour values

#FF663C#FF663C

HEX#FF663C

RGBrgb(255, 102, 60)

RGB (0–1)1, 0.4, 0.2353

RGB percentages100%, 40%, 23.5%

HSLhsl(12.9, 100%, 61.8%)

HSV / HSBhsv(12.9, 76.5%, 100%)

CMYK0%, 60%, 76.5%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,737,852

CSS custom property--colour: #FF663C;

Brightness & contrast

Relative luminance0.31089WCAG 2.x, 0 is black and 1 is white

Perceived brightness161.1 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 7.22:1

Contrast with white2.91:1WCAG normal text: Fail

Contrast with black7.22:1WCAG normal text: AAA

Greyscale equivalent#838383

Inverted#0099C3

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#918236no red cones; affects about 1% of men; ΔE 61.5 from the original

Deuteranopia#B7A437no green cones; the most common form, about 1% of men; ΔE 61.9 from the original

Tritanopia#FF405Dno blue cones; rare, and affects men and women equally; ΔE 28.7 from the original

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

Contrast with white, large text2.91:1WCAG large text: Fail

Contrast with black, large text7.22:1WCAG large text: AAA

Named colours

Tomato · ΔE 6.2 Coral · ΔE 12.7 Chocolate · ΔE 20.6 Orange red · ΔE 20.9 Salmon · ΔE 26.1 Firebrick · ΔE 27.7

Nearest named CSS colourTomato (#FF6347)ΔE 6.23, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#3CD5FF

Analogous#FF3C73, #FFC73C

Triadic#3CFF66, #663CFF

Split complementary#3CFFC7, #3C74FF

Tetradic#74FF3C, #3CD5FF, #C83CFF

Tints, shades & saturation

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

Lighter +40%#FFFFFF

Lighter +30%#FFDED5

Lighter +20%#FFB6A2

Lighter +10%#FF8E6F

Darker −10%#FF3E09

Darker −20%#D52E00

Darker −30%#A22300

Darker −40%#6F1800

More saturated +25%#FF663C

Less saturated −25%#E77454

Channel breakdown

R255

G102

B60

Red255 (100%)

Green102 (40%)

Blue60 (23.5%)

Hue12.92°

Saturation (HSL)100%

Lightness61.76%

Dominant channelRed

Hex per channelR FF · G 66 · B 3C

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF663C (chemical formula)

Formula
12,626.683 g/mol
665 atoms

FF663C has a molar mass of 12,626.683 g/mol, made up of 665 atoms across 2 elements: 664 × F, 1 × C.

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Molar mass

Molar mass12,626.683 g/mol

Total atoms per molecule665

Distinct elements2

Mass of one molecule2.09671 × 10^-20 g

Molecules per gram4.7693767 × 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

F99.9%

C0.1%

Fluorine (F × 664)12,614.672 g/mol, 99.905%

Carbon (C)12.011 g/mol, 0.095%

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Elements in this formula

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