Recognised as Colour

#FF3748

#FF3748
Red
Dark
Nearest: Crimson

#FF3748 is a red with RGB values 255, 55, 72 and HSL 355°, 100%, 61%. It is a dark colour, so black text on it reaches 5.9:1 contrast (AA for normal text). The nearest named colour is Crimson.

Colour values

#FF3748#FF3748

HEX#FF3748

RGBrgb(255, 55, 72)

RGB (0–1)1, 0.2157, 0.2824

RGB percentages100%, 21.6%, 28.2%

HSLhsl(354.9, 100%, 60.8%)

HSV / HSBhsv(354.9, 78.4%, 100%)

CMYK0%, 78.4%, 71.8%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,725,832

CSS custom property--colour: #FF3748;

Brightness & contrast

Relative luminance0.2446WCAG 2.x, 0 is black and 1 is white

Perceived brightness147.7 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.89:1

Contrast with white3.56:1WCAG normal text: Fail

Contrast with black5.89:1WCAG normal text: AA

Greyscale equivalent#636363

Inverted#00C8B7

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#756C47no red cones; affects about 1% of men; ΔE 78.6 from the original

Deuteranopia#A79741no green cones; the most common form, about 1% of men; ΔE 78.8 from the original

Tritanopia#FF0040no blue cones; rare, and affects men and women equally; ΔE 8.4 from the original

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

Contrast with white, large text3.56:1WCAG large text: AA

Contrast with black, large text5.89:1WCAG large text: AAA

Named colours

Crimson · ΔE 11.4 Tomato · ΔE 18 Firebrick · ΔE 24.8 Red · ΔE 28.7 Orange red · ΔE 30.1 Coral · ΔE 31.1

Nearest named CSS colourCrimson (#DC143C)ΔE 11.45, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#37FFEE

Analogous#FF37AC, #FF8A37

Triadic#48FF37, #3748FF

Split complementary#37FF8A, #37ACFF

Tetradic#ACFF37, #37FFEE, #8A37FF

Tints, shades & saturation

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

Lighter +40%#FFFFFF

Lighter +30%#FFD0D4

Lighter +20%#FF9DA5

Lighter +10%#FF6A77

Darker −10%#FF0419

Darker −20%#D00012

Darker −30%#9D000D

Darker −40%#6A0009

More saturated +25%#FF3748

Less saturated −25%#E6505D

Channel breakdown

R255

G55

B72

Red255 (100%)

Green55 (21.6%)

Blue72 (28.2%)

Hue354.9°

Saturation (HSL)100%

Lightness60.78%

Dominant channelRed

Hex per channelR FF · G 37 · B 48

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF3748 (chemical formula)

Formula
71,223.502 g/mol
3749 atoms

FF3748 has a molar mass of 71,223.502 g/mol, made up of 3749 atoms across 1 element: 3749 × F.

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Molar mass

Molar mass71,223.502 g/mol

Total atoms per molecule3749

Distinct elements1

Mass of one molecule1.1826941 × 10^-19 g

Molecules per gram8.4552719 × 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 × 3749)71,223.502 g/mol, 100%

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Elements in this formula

Fluorine

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