Recognised as Colour
#F81533
- #F81533
- Red
- Dark
- Nearest: Crimson
#F81533 is a red with RGB values 248, 21, 51 and HSL 352°, 94%, 53%. It is a dark colour, so black text on it reaches 5.1:1 contrast (AA for normal text). The nearest named colour is Crimson.
Colour values
#F81533#F81533
HEX#F81533
RGBrgb(248, 21, 51)
RGB (0–1)0.9725, 0.0824, 0.2
RGB percentages97.3%, 8.2%, 20%
HSLhsl(352.1, 94.2%, 52.7%)
HSV / HSBhsv(352.1, 91.5%, 97.3%)
CMYK0%, 91.5%, 79.4%, 2.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer16,258,355
CSS custom property--colour: #F81533;
Brightness & contrast
Relative luminance0.20732WCAG 2.x, 0 is black and 1 is white
Perceived brightness137.6 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.15:1
Contrast with white4.08:1WCAG normal text: Fail
Contrast with black5.15:1WCAG normal text: AA
Greyscale equivalent#474747
Inverted#07EACC
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text4.08:1WCAG large text: AA
Contrast with black, large text5.15:1WCAG large text: AAA
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#15F8DA
Analogous#F815A4, #F86915
Triadic#33F815, #1533F8
Split complementary#15F868, #15A5F8
Tetradic#A5F815, #15F8DA, #6915F8
Tints, shades & saturation
Channel breakdown
R248
G21
B51
Red248 (97.3%)
Green21 (8.2%)
Blue51 (20%)
Hue352.07°
Saturation (HSL)94.19%
Lightness52.75%
Dominant channelRed
Hex per channelR F8 · G 15 · B 33
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Also reads as
F81533 (chemical formula)
- Formula
- 1,548,963.934 g/mol
- 81533 atoms
F81533 has a molar mass of 1,548,963.934 g/mol, made up of 81533 atoms across 1 element: 81533 × F.
Molar mass
Molar mass1,548,963.934 g/mol
Total atoms per molecule81533
Distinct elements1
Mass of one molecule2.5721151 × 10^-18 g
Molecules per gram3.8878509 × 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 × 81533)1,548,963.934 g/mol, 100%
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