Colour
#51A3AD
- #51A3AD
- Cyan
- Dark
- Nearest: Cadetblue
#51A3AD is a cyan with RGB values 81, 163, 173 and HSL 187°, 36%, 50%. It is a dark colour, so black text on it reaches 7.2:1 contrast (AAA for normal text). The nearest named colour is Cadetblue.
Colour values
#51A3AD#51A3AD
HEX#51A3AD
RGBrgb(81, 163, 173)
RGB (0–1)0.3176, 0.6392, 0.6784
RGB percentages31.8%, 63.9%, 67.8%
HSLhsl(186.5, 36.2%, 49.8%)
HSV / HSBhsv(186.5, 53.2%, 67.8%)
CMYK53.2%, 5.8%, 0%, 32.2%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,350,317
CSS custom property--colour: #51A3AD;
Brightness & contrast
Relative luminance0.30961WCAG 2.x, 0 is black and 1 is white
Perceived brightness144.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 7.19:1
Contrast with white2.92:1WCAG normal text: Fail
Contrast with black7.19:1WCAG normal text: AAA
Greyscale equivalent#929292
Inverted#AE5C52
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text2.92:1WCAG large text: Fail
Contrast with black, large text7.19:1WCAG large text: AAA
Named colours
Hue familycyan
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#AD5B51
Analogous#51AD89, #5175AD
Triadic#AD51A3, #A3AD51
Split complementary#AD5175, #AD8951
Tetradic#8951AD, #AD5B51, #75AD51
Tints, shades & saturation
Channel breakdown
R81
G163
B173
Red81 (31.8%)
Green163 (63.9%)
Blue173 (67.8%)
Hue186.52°
Saturation (HSL)36.22%
Lightness49.8%
Dominant channelBlue
Hex per channelR 51 · G A3 · B AD
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