Recognised as Colour

#FF4538

#FF4538
Red
Dark
Nearest: Tomato

#FF4538 is a red with RGB values 255, 69, 56 and HSL 4°, 100%, 61%. It is a dark colour, so black text on it reaches 6.2:1 contrast (AA for normal text). The nearest named colour is Tomato.

Colour values

#FF4538#FF4538

HEX#FF4538

RGBrgb(255, 69, 56)

RGB (0–1)1, 0.2706, 0.2196

RGB percentages100%, 27.1%, 22%

HSLhsl(3.9, 100%, 61%)

HSV / HSBhsv(3.9, 78%, 100%)

CMYK0%, 72.9%, 78%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,729,400

CSS custom property--colour: #FF4538;

Brightness & contrast

Relative luminance0.25802WCAG 2.x, 0 is black and 1 is white

Perceived brightness150.3 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 6.16:1

Contrast with white3.41:1WCAG normal text: Fail

Contrast with black6.16:1WCAG normal text: AA

Greyscale equivalent#6C6C6C

Inverted#00BAC7

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#7D7134no red cones; affects about 1% of men; ΔE 74.6 from the original

Deuteranopia#AB9A30no green cones; the most common form, about 1% of men; ΔE 74.9 from the original

Tritanopia#FF0044no blue cones; rare, and affects men and women equally; ΔE 17.3 from the original

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

Contrast with white, large text3.41:1WCAG large text: AA

Contrast with black, large text6.16:1WCAG large text: AAA

Named colours

Tomato · ΔE 12.1 Orange red · ΔE 19.4 Crimson · ΔE 19.4 Red · ΔE 21.5 Coral · ΔE 25.3 Firebrick · ΔE 25.6

Nearest named CSS colourTomato (#FF6347)ΔE 12.11, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#38F2FF

Analogous#FF388F, #FFA938

Triadic#38FF45, #4538FF

Split complementary#38FFA9, #388EFF

Tetradic#8FFF38, #38F2FF, #A938FF

Tints, shades & saturation

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

Lighter +40%#FFFFFF

Lighter +30%#FFD4D1

Lighter +20%#FFA49E

Lighter +10%#FF756B

Darker −10%#FF1505

Darker −20%#D10E00

Darker −30%#9E0A00

Darker −40%#6B0700

More saturated +25%#FF4538

Less saturated −25%#E65B51

Channel breakdown

R255

G69

B56

Red255 (100%)

Green69 (27.1%)

Blue56 (22%)

Hue3.92°

Saturation (HSL)100%

Lightness60.98%

Dominant channelRed

Hex per channelR FF · G 45 · B 38

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

FF4538 (chemical formula)

Formula
86,231.922 g/mol
4539 atoms

FF4538 has a molar mass of 86,231.922 g/mol, made up of 4539 atoms across 1 element: 4539 × F.

Open this reading on its own page →

Molar mass

Molar mass86,231.922 g/mol

Total atoms per molecule4539

Distinct elements1

Mass of one molecule1.4319148 × 10^-19 g

Molecules per gram6.983656 × 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 × 4539)86,231.922 g/mol, 100%

Keep nerding

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

Elements in this formula

Fluorine

Nerdulate something else

Nothing in mind? Surprise me · today’s page