Recognised as Colour
#F40917
- #F40917
- Red
- Dark
- Nearest: Red
#F40917 is a red with RGB values 244, 9, 23 and HSL 356°, 93%, 50%. It is a dark colour, so black text on it reaches 4.9:1 contrast (AA for normal text). The nearest named colour is Red.
Colour values
#F40917#F40917
HEX#F40917
RGBrgb(244, 9, 23)
RGB (0–1)0.9569, 0.0353, 0.0902
RGB percentages95.7%, 3.5%, 9%
HSLhsl(356.4, 92.9%, 49.6%)
HSV / HSBhsv(356.4, 96.3%, 95.7%)
CMYK0%, 96.3%, 90.6%, 4.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer15,993,111
CSS custom property--colour: #F40917;
Brightness & contrast
Relative luminance0.1949WCAG 2.x, 0 is black and 1 is white
Perceived brightness133.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 4.9:1
Contrast with white4.29:1WCAG normal text: Fail
Contrast with black4.9:1WCAG normal text: AA
Greyscale equivalent#3C3C3C
Inverted#0BF6E8
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text4.29:1WCAG large text: AA
Contrast with black, large text4.9:1WCAG large text: AAA
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#09F4E6
Analogous#F4098D, #F47009
Triadic#17F409, #0917F4
Split complementary#09F470, #098DF4
Tetradic#8DF409, #09F4E6, #7009F4
Tints, shades & saturation
Channel breakdown
R244
G9
B23
Red244 (95.7%)
Green9 (3.5%)
Blue23 (9%)
Hue356.43°
Saturation (HSL)92.89%
Lightness49.61%
Dominant channelRed
Hex per channelR F4 · G 09 · B 17
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Also reads as
F40917 (chemical formula)
- Formula
- 777,341.166 g/mol
- 40917 atoms
F40917 has a molar mass of 777,341.166 g/mol, made up of 40917 atoms across 1 element: 40917 × F.
Molar mass
Molar mass777,341.166 g/mol
Total atoms per molecule40917
Distinct elements1
Mass of one molecule1.2908054 × 10^-18 g
Molecules per gram7.7471013 × 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 × 40917)777,341.166 g/mol, 100%
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