Recognised as Colour

#FF3F40

#FF3F40
Red
Dark
Nearest: Tomato

#FF3F40 is a red with RGB values 255, 63, 64 and HSL 360°, 100%, 62%. It is a dark colour, so black text on it reaches 6:1 contrast (AA for normal text). The nearest named colour is Tomato.

Colour values

#FF3F40#FF3F40

HEX#FF3F40

RGBrgb(255, 63, 64)

RGB (0–1)1, 0.2471, 0.251

RGB percentages100%, 24.7%, 25.1%

HSLhsl(359.7, 100%, 62.4%)

HSV / HSBhsv(359.7, 75.3%, 100%)

CMYK0%, 75.3%, 74.9%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,727,872

CSS custom property--colour: #FF3F40;

Brightness & contrast

Relative luminance0.25185WCAG 2.x, 0 is black and 1 is white

Perceived brightness149.1 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 6.04:1

Contrast with white3.48:1WCAG normal text: Fail

Contrast with black6.04:1WCAG normal text: AA

Greyscale equivalent#686868

Inverted#00C0BF

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#7A6F3Eno red cones; affects about 1% of men; ΔE 76.2 from the original

Deuteranopia#A99838no green cones; the most common form, about 1% of men; ΔE 76.4 from the original

Tritanopia#FF0042no blue cones; rare, and affects men and women equally; ΔE 12.1 from the original

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

Contrast with white, large text3.48:1WCAG large text: AA

Contrast with black, large text6.04:1WCAG large text: AAA

Named colours

Tomato · ΔE 14 Crimson · ΔE 15.1 Orange red · ΔE 24.5 Firebrick · ΔE 24.5 Red · ΔE 24.7 Coral · ΔE 27.5

Nearest named CSS colourTomato (#FF6347)ΔE 14.02, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#3FFFFE

Analogous#FF3FA0, #FF9E3F

Triadic#40FF3F, #3F40FF

Split complementary#3FFF9E, #3FA0FF

Tetradic#A0FF3F, #3FFFFE, #9E3FFF

Tints, shades & saturation

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

Lighter +40%#FFFFFF

Lighter +30%#FFD8D8

Lighter +20%#FFA5A5

Lighter +10%#FF7273

Darker −10%#FF0C0D

Darker −20%#D80001

Darker −30%#A50001

Darker −40%#720001

More saturated +25%#FF3F40

Less saturated −25%#E75758

Channel breakdown

R255

G63

B64

Red255 (100%)

Green63 (24.7%)

Blue64 (25.1%)

Hue359.69°

Saturation (HSL)100%

Lightness62.35%

Dominant channelRed

Hex per channelR FF · G 3F · B 40

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF3F40 (chemical formula)

Formula
835.912 g/mol
44 atoms

FF3F40 has a molar mass of 835.912 g/mol, made up of 44 atoms across 1 element: 44 × F.

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Molar mass

Molar mass835.912 g/mol

Total atoms per molecule44

Distinct elements1

Mass of one molecule1.3880645 × 10^-21 g

Molecules per gram7.204276 × 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 × 44)835.912 g/mol, 100%

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Elements in this formula

Fluorine

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