Recognised as Colour
#A4170D
- #A4170D
- Red
- Dark
- Nearest: Firebrick
#A4170D is a red with RGB values 164, 23, 13 and HSL 4°, 85%, 35%. It is a dark colour, so white text on it reaches 7.8:1 contrast (AAA for normal text). The nearest named colour is Firebrick.
Colour values
#A4170D#A4170D
HEX#A4170D
RGBrgb(164, 23, 13)
RGB (0–1)0.6431, 0.0902, 0.051
RGB percentages64.3%, 9%, 5.1%
HSLhsl(4, 85.3%, 34.7%)
HSV / HSBhsv(4, 92.1%, 64.3%)
CMYK0%, 86%, 92.1%, 35.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer10,753,805
CSS custom property--colour: #A4170D;
Brightness & contrast
Relative luminance0.08534WCAG 2.x, 0 is black and 1 is white
Perceived brightness91.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 7.76:1
Contrast with white7.76:1WCAG normal text: AAA
Contrast with black2.71:1WCAG normal text: Fail
Greyscale equivalent#343434
Inverted#5BE8F2
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text7.76:1WCAG large text: AAA
Contrast with black, large text2.71:1WCAG large text: Fail
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#0D9AA4
Analogous#A40D4F, #A4630D
Triadic#0DA417, #170DA4
Split complementary#0DA462, #0D4FA4
Tetradic#4EA40D, #0D9AA4, #620DA4
Tints, shades & saturation
Channel breakdown
R164
G23
B13
Red164 (64.3%)
Green23 (9%)
Blue13 (5.1%)
Hue3.97°
Saturation (HSL)85.31%
Lightness34.71%
Dominant channelRed
Hex per channelR A4 · G 17 · B 0D
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