Recognised as Colour

#FF3621

#FF3621
Red
Dark
Nearest: Orange red

#FF3621 is a red with RGB values 255, 54, 33 and HSL 6°, 100%, 56%. It is a dark colour, so black text on it reaches 5.8:1 contrast (AA for normal text). The nearest named colour is Orange red.

Colour values

#FF3621#FF3621

HEX#FF3621

RGBrgb(255, 54, 33)

RGB (0–1)1, 0.2118, 0.1294

RGB percentages100%, 21.2%, 12.9%

HSLhsl(5.7, 100%, 56.5%)

HSV / HSBhsv(5.7, 87.1%, 100%)

CMYK0%, 78.8%, 87.1%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,725,537

CSS custom property--colour: #FF3621;

Brightness & contrast

Relative luminance0.24008WCAG 2.x, 0 is black and 1 is white

Perceived brightness145.9 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.8:1

Contrast with white3.62:1WCAG normal text: Fail

Contrast with black5.8:1WCAG normal text: AA

Greyscale equivalent#5F5F5F

Inverted#00C9DE

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#786A1Ano red cones; affects about 1% of men; ΔE 78.6 from the original

Deuteranopia#A9960Eno green cones; the most common form, about 1% of men; ΔE 78.6 from the original

Tritanopia#FF0034no blue cones; rare, and affects men and women equally; ΔE 14.4 from the original

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

Contrast with white, large text3.62:1WCAG large text: AA

Contrast with black, large text5.8:1WCAG large text: AAA

Named colours

Orange red · ΔE 11.3 Red · ΔE 11.6 Tomato · ΔE 20.2 Crimson · ΔE 26.9 Coral · ΔE 31.5 Firebrick · ΔE 31.9

Nearest named CSS colourOrange red (#FF4500)ΔE 11.28, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#21EAFF

Analogous#FF217B, #FFA521

Triadic#21FF36, #3621FF

Split complementary#21FFA5, #217BFF

Tetradic#7BFF21, #21EAFF, #A521FF

Tints, shades & saturation

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

Lighter +40%#FFEFED

Lighter +30%#FFC1BA

Lighter +20%#FF9287

Lighter +10%#FF6454

Darker −10%#ED1600

Darker −20%#BA1200

Darker −30%#870D00

Darker −40%#540800

More saturated +25%#FF3621

Less saturated −25%#E34D3D

Channel breakdown

R255

G54

B33

Red255 (100%)

Green54 (21.2%)

Blue33 (12.9%)

Hue5.68°

Saturation (HSL)100%

Lightness56.47%

Dominant channelRed

Hex per channelR FF · G 36 · B 21

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF3621 (chemical formula)

Formula
68,810.756 g/mol
3622 atoms

FF3621 has a molar mass of 68,810.756 g/mol, made up of 3622 atoms across 1 element: 3622 × F.

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Molar mass

Molar mass68,810.756 g/mol

Total atoms per molecule3622

Distinct elements1

Mass of one molecule1.1426295 × 10^-19 g

Molecules per gram8.7517433 × 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 × 3622)68,810.756 g/mol, 100%

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Elements in this formula

Fluorine

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