Recognised as Colour

#F33815

#F33815
Red
Dark
Nearest: Orange red

#F33815 is a red with RGB values 243, 56, 21 and HSL 9°, 90%, 52%. It is a dark colour, so black text on it reaches 5.4:1 contrast (AA for normal text). The nearest named colour is Orange red.

Colour values

#F33815#F33815

HEX#F33815

RGBrgb(243, 56, 21)

RGB (0–1)0.9529, 0.2196, 0.0824

RGB percentages95.3%, 22%, 8.2%

HSLhsl(9.5, 90.2%, 51.8%)

HSV / HSBhsv(9.5, 91.4%, 95.3%)

CMYK0%, 77%, 91.4%, 4.7%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer15,939,605

CSS custom property--colour: #F33815;

Brightness & contrast

Relative luminance0.21937WCAG 2.x, 0 is black and 1 is white

Perceived brightness139.8 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.39:1

Contrast with white3.9:1WCAG normal text: Fail

Contrast with black5.39:1WCAG normal text: AA

Greyscale equivalent#5D5D5D

Inverted#0CC7EA

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#756708no red cones; affects about 1% of men; ΔE 74.3 from the original

Deuteranopia#A29000no green cones; the most common form, about 1% of men; ΔE 74.5 from the original

Tritanopia#FF0034no blue cones; rare, and affects men and women equally; ΔE 18.3 from the original

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

Contrast with white, large text3.9:1WCAG large text: AA

Contrast with black, large text5.39:1WCAG large text: AAA

Named colours

Orange red · ΔE 9 Red · ΔE 13.3 Tomato · ΔE 19.7 Crimson · ΔE 28.2 Coral · ΔE 29.8 Firebrick · ΔE 30.2

Nearest named CSS colourOrange red (#FF4500)ΔE 8.96, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#15D0F3

Analogous#F31561, #F3A715

Triadic#15F338, #3815F3

Split complementary#15F3A7, #1561F3

Tetradic#61F315, #15D0F3, #A715F3

Tints, shades & saturation

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

Lighter +40%#FDDDD7

Lighter +30%#FAB4A7

Lighter +20%#F88B76

Lighter +10%#F56146

Darker −10%#CB290A

Darker −20%#9A1F08

Darker −30%#6A1505

Darker −40%#390B03

More saturated +25%#FF3009

Less saturated −25%#D44D34

Channel breakdown

R243

G56

B21

Red243 (95.3%)

Green56 (22%)

Blue21 (8.2%)

Hue9.46°

Saturation (HSL)90.24%

Lightness51.76%

Dominant channelRed

Hex per channelR F3 · G 38 · B 15

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Harmonies

Lighter and darker

Similar named colours

Also reads as

F33815 (chemical formula)

Formula
642,417.37 g/mol
33815 atoms

F33815 has a molar mass of 642,417.37 g/mol, made up of 33815 atoms across 1 element: 33815 × F.

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Molar mass

Molar mass642,417.37 g/mol

Total atoms per molecule33815

Distinct elements1

Mass of one molecule1.0667591 × 10^-18 g

Molecules per gram9.3741873 × 10^17

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 × 33815)642,417.37 g/mol, 100%

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Elements in this formula

Fluorine

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