Recognised as Colour
#F55531
- #F55531
- Red
- Dark
- Nearest: Tomato
#F55531 is a red with RGB values 245, 85, 49 and HSL 11°, 91%, 58%. 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
#F55531#F55531
HEX#F55531
RGBrgb(245, 85, 49)
RGB (0–1)0.9608, 0.3333, 0.1922
RGB percentages96.1%, 33.3%, 19.2%
HSLhsl(11, 90.7%, 57.6%)
HSV / HSBhsv(11, 80%, 96.1%)
CMYK0%, 65.3%, 80%, 3.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer16,078,129
CSS custom property--colour: #F55531;
Brightness & contrast
Relative luminance0.26131WCAG 2.x, 0 is black and 1 is white
Perceived brightness149.9 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 6.23:1
Contrast with white3.37:1WCAG normal text: Fail
Contrast with black6.23:1WCAG normal text: AA
Greyscale equivalent#747474
Inverted#0AAACE
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text3.37:1WCAG large text: AA
Contrast with black, large text6.23:1WCAG large text: AAA
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#31D1F5
Analogous#F5316F, #F5B731
Triadic#31F555, #5531F5
Split complementary#31F5B7, #316FF5
Tetradic#6FF531, #31D1F5, #B731F5
Tints, shades & saturation
Channel breakdown
R245
G85
B49
Red245 (96.1%)
Green85 (33.3%)
Blue49 (19.2%)
Hue11.02°
Saturation (HSL)90.74%
Lightness57.65%
Dominant channelRed
Hex per channelR F5 · G 55 · B 31
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Also reads as
F55531 (chemical formula)
- Formula
- 1,054,977.938 g/mol
- 55531 atoms
F55531 has a molar mass of 1,054,977.938 g/mol, made up of 55531 atoms across 1 element: 55531 × F.
Molar mass
Molar mass1,054,977.938 g/mol
Total atoms per molecule55531
Distinct elements1
Mass of one molecule1.7518321 × 10^-18 g
Molecules per gram5.7083097 × 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 × 55531)1,054,977.938 g/mol, 100%
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