Recognised as Colour
#F33718
- #F33718
- Red
- Dark
- Nearest: Orange red
#F33718 is a red with RGB values 243, 55, 24 and HSL 8°, 90%, 52%. It is a dark colour, so black text on it reaches 5.4:1 contrast (AA for normal text). The nearest named colour is Orange red.
Colour values
#F33718#F33718
HEX#F33718
RGBrgb(243, 55, 24)
RGB (0–1)0.9529, 0.2157, 0.0941
RGB percentages95.3%, 21.6%, 9.4%
HSLhsl(8.5, 90.1%, 52.4%)
HSV / HSBhsv(8.5, 90.1%, 95.3%)
CMYK0%, 77.4%, 90.1%, 4.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer15,939,352
CSS custom property--colour: #F33718;
Brightness & contrast
Relative luminance0.21853WCAG 2.x, 0 is black and 1 is white
Perceived brightness139.6 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.37:1
Contrast with white3.91:1WCAG normal text: Fail
Contrast with black5.37:1WCAG normal text: AA
Greyscale equivalent#5D5D5D
Inverted#0CC8E7
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text3.91:1WCAG large text: AA
Contrast with black, large text5.37:1WCAG large text: AAA
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#18D4F3
Analogous#F31867, #F3A418
Triadic#18F337, #3718F3
Split complementary#18F3A4, #1867F3
Tetradic#67F318, #18D4F3, #A418F3
Tints, shades & saturation
Channel breakdown
R243
G55
B24
Red243 (95.3%)
Green55 (21.6%)
Blue24 (9.4%)
Hue8.49°
Saturation (HSL)90.12%
Lightness52.35%
Dominant channelRed
Hex per channelR F3 · G 37 · B 18
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Also reads as
F33718 (chemical formula)
- Formula
- 640,574.564 g/mol
- 33718 atoms
F33718 has a molar mass of 640,574.564 g/mol, made up of 33718 atoms across 1 element: 33718 × F.
Molar mass
Molar mass640,574.564 g/mol
Total atoms per molecule33718
Distinct elements1
Mass of one molecule1.0636991 × 10^-18 g
Molecules per gram9.401155 × 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 × 33718)640,574.564 g/mol, 100%
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