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Recognised as Colour

#66A5C8

  • #66A5C8
  • Blue
  • Dark
  • Nearest: Sky blue

#66A5C8 is a blue with RGB values 102, 165, 200 and HSL 201°, 47%, 59%. It is a dark colour, so black text on it reaches 7.8:1 contrast (AAA for normal text). The nearest named colour is Sky blue.

Colour values

#66A5C8#66A5C8
HEX#66A5C8
RGBrgb(102, 165, 200)
RGB (0–1)0.4, 0.6471, 0.7843
RGB percentages40%, 64.7%, 78.4%
HSLhsl(201.4, 47.1%, 59.2%)
HSV / HSBhsv(201.4, 49%, 78.4%)
CMYK49%, 17.5%, 0%, 21.6%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,727,112
CSS custom property--colour: #66A5C8;

Brightness & contrast

Relative luminance0.33905WCAG 2.x, 0 is black and 1 is white
Perceived brightness153.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 7.78:1
Contrast with white2.7:1WCAG normal text: Fail
Contrast with black7.78:1WCAG normal text: AAA
Greyscale equivalent#9A9A9A
Inverted#995A37

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#94A3CAno red cones; affects about 1% of men; ΔE 14.6 from the original
Deuteranopia#8799C7no green cones; the most common form, about 1% of men; ΔE 15.3 from the original
Tritanopia#34AEB0no blue cones; rare, and affects men and women equally; ΔE 25 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text2.7:1WCAG large text: Fail
Contrast with black, large text7.78:1WCAG large text: AAA

Named colours

Sky blue · ΔE 15.2Light skyblue · ΔE 15.5Steel blue · ΔE 16.2Light slate grey · ΔE 17.9Light steelblue · ΔE 18.8Cadetblue · ΔE 19.4
Nearest named CSS colourSky blue (#87CEEB)ΔE 15.2, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#C88966
Analogous#66C8BA, #6674C8
Triadic#C866A5, #A5C866
Split complementary#C86674, #C8BA66
Tetradic#BA66C8, #C88966, #74C866

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FCFDFE
Lighter +30%#D7E7F0
Lighter +20%#B1D1E3
Lighter +10%#8CBBD5
Darker −10%#428EB9
Darker −20%#357193
Darker −30%#27556E
Darker −40%#1A3848
More saturated +25%#4CACE2
Less saturated −25%#809EAE

Channel breakdown

R102
G165
B200
Red102 (40%)
Green165 (64.7%)
Blue200 (78.4%)
Hue201.43°
Saturation (HSL)47.12%
Lightness59.22%
Dominant channelBlue
Hex per channelR 66 · G A5 · B C8

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Every value on this page was computed from “66a5c8” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.