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Recognised as Colour

#66B4E3

  • #66B4E3
  • Blue
  • Dark
  • Nearest: Light skyblue

#66B4E3 is a blue with RGB values 102, 180, 227 and HSL 203°, 69%, 65%. It is a dark colour, so black text on it reaches 9.2:1 contrast (AAA for normal text). The nearest named colour is Light skyblue.

Colour values

#66B4E3#66B4E3
HEX#66B4E3
RGBrgb(102, 180, 227)
RGB (0–1)0.4, 0.7059, 0.8902
RGB percentages40%, 70.6%, 89%
HSLhsl(202.6, 69.1%, 64.5%)
HSV / HSBhsv(202.6, 55.1%, 89%)
CMYK55.1%, 20.7%, 0%, 11%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,730,979
CSS custom property--colour: #66B4E3;

Brightness & contrast

Relative luminance0.41013WCAG 2.x, 0 is black and 1 is white
Perceived brightness167.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 9.2:1
Contrast with white2.28:1WCAG normal text: Fail
Contrast with black9.2:1WCAG normal text: AAA
Greyscale equivalent#A7A7A7
Inverted#994B1C

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#9EB3E5no red cones; affects about 1% of men; ΔE 15.7 from the original
Deuteranopia#8DA6E2no green cones; the most common form, about 1% of men; ΔE 17 from the original
Tritanopia#00C0C4no blue cones; rare, and affects men and women equally; ΔE 32 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text2.28:1WCAG large text: Fail
Contrast with black, large text9.2:1WCAG large text: AAA

Named colours

Light skyblue · ΔE 9.8Deep skyblue · ΔE 13.7Sky blue · ΔE 13.8Steel blue · ΔE 19Light steelblue · ΔE 20.1Light blue · ΔE 23.7
Nearest named CSS colourLight skyblue (#87CEFA)ΔE 9.83, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#E39566
Analogous#66E3D3, #6676E3
Triadic#E366B4, #B4E366
Split complementary#E36676, #E3D366
Tetradic#D366E3, #E39566, #75E366

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FFFFFF
Lighter +30%#E7F3FB
Lighter +20%#BCDEF3
Lighter +10%#91C9EB
Darker −10%#3B9FDB
Darker −20%#2385C0
Darker −30%#1B6795
Darker −40%#13496A
More saturated +25%#4FBAFA
Less saturated −25%#7DAECC

Channel breakdown

R102
G180
B227
Red102 (40%)
Green180 (70.6%)
Blue227 (89%)
Hue202.56°
Saturation (HSL)69.06%
Lightness64.51%
Dominant channelBlue
Hex per channelR 66 · G B4 · B E3

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Every value on this page was computed from “66b4e3” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.