Recognised as Colour

#FF5145

#FF5145
Red
Dark
Nearest: Tomato

#FF5145 is a red with RGB values 255, 81, 69 and HSL 4°, 100%, 64%. It is a dark colour, so black text on it reaches 6.5:1 contrast (AA for normal text). The nearest named colour is Tomato.

Colour values

#FF5145#FF5145

HEX#FF5145

RGBrgb(255, 81, 69)

RGB (0–1)1, 0.3176, 0.2706

RGB percentages100%, 31.8%, 27.1%

HSLhsl(3.9, 100%, 63.5%)

HSV / HSBhsv(3.9, 72.9%, 100%)

CMYK0%, 68.2%, 72.9%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,732,485

CSS custom property--colour: #FF5145;

Brightness & contrast

Relative luminance0.27575WCAG 2.x, 0 is black and 1 is white

Perceived brightness154.4 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 6.51:1

Contrast with white3.22:1WCAG normal text: Fail

Contrast with black6.51:1WCAG normal text: AA

Greyscale equivalent#757575

Inverted#00AEBA

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#837742no red cones; affects about 1% of men; ΔE 70.1 from the original

Deuteranopia#AE9D3Fno green cones; the most common form, about 1% of men; ΔE 70.6 from the original

Tritanopia#FF1450no blue cones; rare, and affects men and women equally; ΔE 20.2 from the original

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

Contrast with white, large text3.22:1WCAG large text: AA

Contrast with black, large text6.51:1WCAG large text: AAA

Named colours

Tomato · ΔE 7.9 Crimson · ΔE 17.6 Coral · ΔE 21.3 Firebrick · ΔE 23.3 Orange red · ΔE 24.7 Salmon · ΔE 26.2

Nearest named CSS colourTomato (#FF6347)ΔE 7.87, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#45F3FF

Analogous#FF4596, #FFAE45

Triadic#45FF51, #5145FF

Split complementary#45FFAE, #4596FF

Tetradic#96FF45, #45F3FF, #AE45FF

Tints, shades & saturation

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

Lighter +40%#FFFFFF

Lighter +30%#FFE0DE

Lighter +20%#FFB0AB

Lighter +10%#FF8178

Darker −10%#FF2112

Darker −20%#DE0E00

Darker −30%#AB0B00

Darker −40%#780800

More saturated +25%#FF5145

Less saturated −25%#E8655C

Channel breakdown

R255

G81

B69

Red255 (100%)

Green81 (31.8%)

Blue69 (27.1%)

Hue3.87°

Saturation (HSL)100%

Lightness63.53%

Dominant channelRed

Hex per channelR FF · G 51 · B 45

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF5145 (chemical formula)

Formula
97,763.708 g/mol
5146 atoms

FF5145 has a molar mass of 97,763.708 g/mol, made up of 5146 atoms across 1 element: 5146 × F.

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Molar mass

Molar mass97,763.708 g/mol

Total atoms per molecule5146

Distinct elements1

Mass of one molecule1.6234046 × 10^-19 g

Molecules per gram6.159894 × 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 × 5146)97,763.708 g/mol, 100%

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Elements in this formula

Fluorine

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