Recognised as Colour
#A63737
- #A63737
- Red
- Dark
- Nearest: Brown
#A63737 is a red with RGB values 166, 55, 55 and HSL 0°, 50%, 43%. It is a dark colour, so white text on it reaches 6.5:1 contrast (AA for normal text). The nearest named colour is Brown.
Colour values
#A63737#A63737
HEX#A63737
RGBrgb(166, 55, 55)
RGB (0–1)0.651, 0.2157, 0.2157
RGB percentages65.1%, 21.6%, 21.6%
HSLhsl(0, 50.2%, 43.3%)
HSV / HSBhsv(0, 66.9%, 65.1%)
CMYK0%, 66.9%, 66.9%, 34.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer10,893,111
CSS custom property--colour: #A63737;
Brightness & contrast
Relative luminance0.11115WCAG 2.x, 0 is black and 1 is white
Perceived brightness101.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 6.52:1
Contrast with white6.52:1WCAG normal text: AA
Contrast with black3.22:1WCAG normal text: Fail
Greyscale equivalent#4F4F4F
Inverted#59C8C8
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text6.52:1WCAG large text: AAA
Contrast with black, large text3.22:1WCAG large text: AA
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#37A6A6
Analogous#A6376F, #A66F37
Triadic#37A637, #3737A6
Split complementary#37A66F, #376FA6
Tetradic#6FA637, #37A6A6, #6F37A6
Tints, shades & saturation
Channel breakdown
R166
G55
B55
Red166 (65.1%)
Green55 (21.6%)
Blue55 (21.6%)
Hue0°
Saturation (HSL)50.23%
Lightness43.33%
Dominant channelRed
Hex per channelR A6 · G 37 · B 37
Keep nerding
Every link below is a page Nerdulator can generate from what it already knows about this value.
Nerdulate something else
Nothing in mind? Surprise me · today’s page