Recognised as Colour

#FF1501

#FF1501
Red
Dark
Nearest: Red

#FF1501 is a red with RGB values 255, 21, 1 and HSL 5°, 100%, 50%. It is a dark colour, so black text on it reaches 5.4:1 contrast (AA for normal text). The nearest named colour is Red.

Colour values

#FF1501#FF1501

HEX#FF1501

RGBrgb(255, 21, 1)

RGB (0–1)1, 0.0824, 0.0039

RGB percentages100%, 8.2%, 0.4%

HSLhsl(4.7, 100%, 50.2%)

HSV / HSBhsv(4.7, 99.6%, 100%)

CMYK0%, 91.8%, 99.6%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,717,057

CSS custom property--colour: #FF1501;

Brightness & contrast

Relative luminance0.21799WCAG 2.x, 0 is black and 1 is white

Perceived brightness140.4 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.36:1

Contrast with white3.92:1WCAG normal text: Fail

Contrast with black5.36:1WCAG normal text: AA

Greyscale equivalent#454545

Inverted#00EAFE

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#6F6100no red cones; affects about 1% of men; ΔE 85.3 from the original

Deuteranopia#A49100no green cones; the most common form, about 1% of men; ΔE 84.2 from the original

Tritanopia#FF0019no blue cones; rare, and affects men and women equally; ΔE 7.3 from the original

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

Contrast with white, large text3.92:1WCAG large text: AA

Contrast with black, large text5.36:1WCAG large text: AAA

Named colours

Red · ΔE 1.8 Orange red · ΔE 11.4 Tomato · ΔE 30.4 Crimson · ΔE 35.1 Firebrick · ΔE 39.9 Coral · ΔE 40.8

Nearest named CSS colourRed (#FF0000)ΔE 1.76, below the just-noticeable difference

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#01EBFF

Analogous#FF016C, #FF9401

Triadic#01FF15, #1501FF

Split complementary#01FF94, #016CFF

Tetradic#6CFF01, #01EBFF, #9401FF

Tints, shades & saturation

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

Lighter +40%#FFD1CD

Lighter +30%#FFA29A

Lighter +20%#FF7367

Lighter +10%#FF4434

Darker −10%#CD1000

Darker −20%#9A0C00

Darker −30%#670800

Darker −40%#340400

More saturated +25%#FF1501

Less saturated −25%#DF3021

Channel breakdown

R255

G21

Red255 (100%)

Green21 (8.2%)

Blue1 (0.4%)

Hue4.72°

Saturation (HSL)100%

Lightness50.2%

Dominant channelRed

Hex per channelR FF · G 15 · B 01

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF1501 (chemical formula)

Formula
28,534.996 g/mol
1502 atoms

FF1501 has a molar mass of 28,534.996 g/mol, made up of 1502 atoms across 1 element: 1502 × F.

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Molar mass

Molar mass28,534.996 g/mol

Total atoms per molecule1502

Distinct elements1

Mass of one molecule4.7383476 × 10^-20 g

Molecules per gram2.1104404 × 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

F100%

Fluorine (F × 1502)28,534.996 g/mol, 100%

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Elements in this formula

Fluorine

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