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Recognised as Colour

#40C8D9

  • #40C8D9
  • Cyan
  • Dark
  • Nearest: Dark turquoise

#40C8D9 is a cyan with RGB values 64, 200, 217 and HSL 187°, 67%, 55%. It is a dark colour, so black text on it reaches 10.5:1 contrast (AAA for normal text). The nearest named colour is Dark turquoise.

Colour values

#40C8D9#40C8D9
HEX#40C8D9
RGBrgb(64, 200, 217)
RGB (0–1)0.251, 0.7843, 0.851
RGB percentages25.1%, 78.4%, 85.1%
HSLhsl(186.7, 66.8%, 55.1%)
HSV / HSBhsv(186.7, 70.5%, 85.1%)
CMYK70.5%, 7.8%, 0%, 14.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer4,245,721
CSS custom property--colour: #40C8D9;

Brightness & contrast

Relative luminance0.47408WCAG 2.x, 0 is black and 1 is white
Perceived brightness173.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 10.48:1
Contrast with white2:1WCAG normal text: Fail
Contrast with black10.48:1WCAG normal text: AAA
Greyscale equivalent#ACACAC
Inverted#BF3726

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#B7C0DAno red cones; affects about 1% of men; ΔE 33.2 from the original
Deuteranopia#A1B0D9no green cones; the most common form, about 1% of men; ΔE 34.6 from the original
Tritanopia#00D1CDno blue cones; rare, and affects men and women equally; ΔE 15.1 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text2:1WCAG large text: Fail
Contrast with black, large text10.48:1WCAG large text: AAA

Named colours

Dark turquoise · ΔE 11.1Medium turquoise · ΔE 12.9Sky blue · ΔE 16.5Light seagreen · ΔE 16.9Cadetblue · ΔE 20.7Turquoise · ΔE 21.4
Nearest named CSS colourDark turquoise (#00CED1)ΔE 11.06, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#D95140
Analogous#40D99D, #407CD9
Triadic#D940C8, #C8D940
Split complementary#D9407C, #D99D40
Tetradic#9D40D9, #D95140, #7CD940

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#EAF9FB
Lighter +30%#C0EDF2
Lighter +20%#95E0EA
Lighter +10%#6BD4E1
Darker −10%#26AFC0
Darker −20%#1E8895
Darker −30%#15616B
Darker −40%#0D3B40
More saturated +25%#23DEF6
Less saturated −25%#5DB2BC

Channel breakdown

R64
G200
B217
Red64 (25.1%)
Green200 (78.4%)
Blue217 (85.1%)
Hue186.67°
Saturation (HSL)66.81%
Lightness55.1%
Dominant channelBlue
Hex per channelR 40 · G C8 · B D9

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Every value on this page was computed from “40c8d9” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.