Recognised as Colour

#FB581C

#FB581C
Orange
Dark
Nearest: Orange red

#FB581C is a orange with RGB values 251, 88, 28 and HSL 16°, 97%, 55%. It is a dark colour, so black text on it reaches 6.5:1 contrast (AA for normal text). The nearest named colour is Orange red.

Colour values

#FB581C#FB581C

HEX#FB581C

RGBrgb(251, 88, 28)

RGB (0–1)0.9843, 0.3451, 0.1098

RGB percentages98.4%, 34.5%, 11%

HSLhsl(16.1, 96.5%, 54.7%)

HSV / HSBhsv(16.1, 88.8%, 98.4%)

CMYK0%, 64.9%, 88.8%, 1.6%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,472,092

CSS custom property--colour: #FB581C;

Brightness & contrast

Relative luminance0.27573WCAG 2.x, 0 is black and 1 is white

Perceived brightness153.2 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#767676

Inverted#04A7E3

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#88780Cno red cones; affects about 1% of men; ΔE 65.7 from the original

Deuteranopia#B09D0Dno green cones; the most common form, about 1% of men; ΔE 66.3 from the original

Tritanopia#FF234Eno blue cones; rare, and affects men and women equally; ΔE 34.3 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

Orange red · ΔE 10.1 Tomato · ΔE 16.9 Red · ΔE 21.6 Coral · ΔE 22.6 Chocolate · ΔE 23.9 Dark orange · ΔE 28

Nearest named CSS colourOrange red (#FF4500)ΔE 10.14, a distinctly different colour

Hue familyorange

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#1CBFFB

Analogous#FB1C50, #FBC71C

Triadic#1CFB58, #581CFB

Split complementary#1CFBC7, #1C50FB

Tetradic#50FB1C, #1CBFFB, #C71CFB

Tints, shades & saturation

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

Lighter +40%#FFEBE4

Lighter +30%#FEC7B2

Lighter +20%#FDA280

Lighter +10%#FC7D4E

Darker −10%#E03F04

Darker −20%#AE3103

Darker −30%#7C2302

Darker −40%#4A1501

More saturated +25%#FF5618

Less saturated −25%#DE6539

Channel breakdown

R251

G88

B28

Red251 (98.4%)

Green88 (34.5%)

Blue28 (11%)

Hue16.14°

Saturation (HSL)96.54%

Lightness54.71%

Dominant channelRed

Hex per channelR FB · G 58 · B 1C

Keep nerding

Every link below is a page Nerdulator can generate from what it already knows about this value.

Harmonies

Lighter and darker

Similar named colours

Also reads as

FB581C (chemical formula)

Formula
6,311.619 g/mol
583 atoms

FB581C has a molar mass of 6,311.619 g/mol, made up of 583 atoms across 3 elements: 1 × F, 581 × B, 1 × C.

Open this reading on its own page →

Molar mass

Molar mass6,311.619 g/mol

Total atoms per molecule583

Distinct elements3

Mass of one molecule1.048069 × 10^-20 g

Molecules per gram9.5413566 × 10^19

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

F0.3%

B99.5%

C0.2%

Fluorine (F)18.998 g/mol, 0.301%

Boron (B × 581)6,280.61 g/mol, 99.509%

Carbon (C)12.011 g/mol, 0.19%

Keep nerding

Every link below is a page Nerdulator can generate from what it already knows about this value.

Elements in this formula

Nerdulate something else

Nothing in mind? Surprise me · today’s page