Recognised as Colour

#FF3945

#FF3945
Red
Dark
Nearest: Crimson

#FF3945 is a red with RGB values 255, 57, 69 and HSL 356°, 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

#FF3945#FF3945

HEX#FF3945

RGBrgb(255, 57, 69)

RGB (0–1)1, 0.2235, 0.2706

RGB percentages100%, 22.4%, 27.1%

HSLhsl(356.4, 100%, 61.2%)

HSV / HSBhsv(356.4, 77.6%, 100%)

CMYK0%, 77.6%, 72.9%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,726,341

CSS custom property--colour: #FF3945;

Brightness & contrast

Relative luminance0.24616WCAG 2.x, 0 is black and 1 is white

Perceived brightness148 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.92:1

Contrast with white3.55:1WCAG normal text: Fail

Contrast with black5.92:1WCAG normal text: AA

Greyscale equivalent#646464

Inverted#00C6BA

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#776D43no red cones; affects about 1% of men; ΔE 77.9 from the original

Deuteranopia#A7973Eno green cones; the most common form, about 1% of men; ΔE 78.3 from the original

Tritanopia#FF0040no blue cones; rare, and affects men and women equally; ΔE 9 from the original

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

Contrast with white, large text3.55:1WCAG large text: AA

Contrast with black, large text5.92:1WCAG large text: AAA

Named colours

Crimson · ΔE 12.5 Tomato · ΔE 16.7 Firebrick · ΔE 24.6 Red · ΔE 27.1 Orange red · ΔE 28.1 Coral · ΔE 30

Nearest named CSS colourCrimson (#DC143C)ΔE 12.51, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#39FFF3

Analogous#FF39A8, #FF9039

Triadic#45FF39, #3945FF

Split complementary#39FF90, #39A8FF

Tetradic#A8FF39, #39FFF3, #9039FF

Tints, shades & saturation

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

Lighter +40%#FFFFFF

Lighter +30%#FFD2D5

Lighter +20%#FF9FA5

Lighter +10%#FF6C75

Darker −10%#FF0615

Darker −20%#D2000D

Darker −30%#9F000A

Darker −40%#6C0007

More saturated +25%#FF3945

Less saturated −25%#E6525B

Channel breakdown

R255

G57

B69

Red255 (100%)

Green57 (22.4%)

Blue69 (27.1%)

Hue356.36°

Saturation (HSL)100%

Lightness61.18%

Dominant channelRed

Hex per channelR FF · G 39 · B 45

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF3945 (chemical formula)

Formula
74,966.108 g/mol
3946 atoms

FF3945 has a molar mass of 74,966.108 g/mol, made up of 3946 atoms across 1 element: 3946 × F.

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Molar mass

Molar mass74,966.108 g/mol

Total atoms per molecule3946

Distinct elements1

Mass of one molecule1.2448415 × 10^-19 g

Molecules per gram8.0331511 × 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 × 3946)74,966.108 g/mol, 100%

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Elements in this formula

Fluorine

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