Recognised as Colour

#FF2F33

#FF2F33
Red
Dark
Nearest: Red

#FF2F33 is a red with RGB values 255, 47, 51 and HSL 359°, 100%, 59%. It is a dark colour, so black text on it reaches 5.7:1 contrast (AA for normal text). The nearest named colour is Red.

Colour values

#FF2F33#FF2F33

HEX#FF2F33

RGBrgb(255, 47, 51)

RGB (0–1)1, 0.1843, 0.2

RGB percentages100%, 18.4%, 20%

HSLhsl(358.8, 100%, 59.2%)

HSV / HSBhsv(358.8, 81.6%, 100%)

CMYK0%, 81.6%, 80%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,723,763

CSS custom property--colour: #FF2F33;

Brightness & contrast

Relative luminance0.23532WCAG 2.x, 0 is black and 1 is white

Perceived brightness145 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.71:1

Contrast with white3.68:1WCAG normal text: Fail

Contrast with black5.71:1WCAG normal text: AA

Greyscale equivalent#5C5C5C

Inverted#00D0CC

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#746930no red cones; affects about 1% of men; ΔE 80.9 from the original

Deuteranopia#A79528no green cones; the most common form, about 1% of men; ΔE 80.4 from the original

Tritanopia#FF0034no blue cones; rare, and affects men and women equally; ΔE 7 from the original

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

Contrast with white, large text3.68:1WCAG large text: AA

Contrast with black, large text5.71:1WCAG large text: AAA

Named colours

Red · ΔE 18.3 Tomato · ΔE 18.4 Crimson · ΔE 18.8 Orange red · ΔE 20.3 Firebrick · ΔE 27.9 Coral · ΔE 31.7

Nearest named CSS colourRed (#FF0000)ΔE 18.26, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#2FFFFB

Analogous#FF2F9B, #FF932F

Triadic#33FF2F, #2F33FF

Split complementary#2FFF93, #2F9BFF

Tetradic#9BFF2F, #2FFFFB, #932FFF

Tints, shades & saturation

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

Lighter +40%#FFFBFB

Lighter +30%#FFC8C9

Lighter +20%#FF9597

Lighter +10%#FF6265

Darker −10%#FB0005

Darker −20%#C80004

Darker −30%#950003

Darker −40%#620002

More saturated +25%#FF2F33

Less saturated −25%#E5494C

Channel breakdown

R255

G47

B51

Red255 (100%)

Green47 (18.4%)

Blue51 (20%)

Hue358.85°

Saturation (HSL)100%

Lightness59.22%

Dominant channelRed

Hex per channelR FF · G 2F · B 33

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF2F33 (chemical formula)

Formula
683.928 g/mol
36 atoms

FF2F33 has a molar mass of 683.928 g/mol, made up of 36 atoms across 1 element: 36 × F.

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Molar mass

Molar mass683.928 g/mol

Total atoms per molecule36

Distinct elements1

Mass of one molecule1.1356892 × 10^-21 g

Molecules per gram8.8052262 × 10^20

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 × 36)683.928 g/mol, 100%

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Elements in this formula

Fluorine

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