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Recognised as Colour

#40E9FF

  • #40E9FF
  • Cyan
  • Light
  • Nearest: Dark turquoise

#40E9FF is a cyan with RGB values 64, 233, 255 and HSL 187°, 100%, 63%. It is a light colour, so black text on it reaches 14.3:1 contrast (AAA for normal text). The nearest named colour is Dark turquoise.

Colour values

#40E9FF#40E9FF
HEX#40E9FF
RGBrgb(64, 233, 255)
RGB (0–1)0.251, 0.9137, 1
RGB percentages25.1%, 91.4%, 100%
HSLhsl(186.9, 100%, 62.5%)
HSV / HSBhsv(186.9, 74.9%, 100%)
CMYK74.9%, 8.6%, 0%, 0%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer4,254,207
CSS custom property--colour: #40E9FF;

Brightness & contrast

Relative luminance0.66588WCAG 2.x, 0 is black and 1 is white
Perceived brightness201.3 of 255ITU-R BT.601 weighting
Light or darkLight
Best text colour on this backgroundBlackcontrast 14.32:1
Contrast with white1.47:1WCAG normal text: Fail
Contrast with black14.32:1WCAG normal text: AAA
Greyscale equivalent#C7C7C7
Inverted#BF1600

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#D4E0FFno red cones; affects about 1% of men; ΔE 37.8 from the original
Deuteranopia#BACDFFno green cones; the most common form, about 1% of men; ΔE 39.6 from the original
Tritanopia#00F4F0no blue cones; rare, and affects men and women equally; ΔE 17.1 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text1.47:1WCAG large text: Fail
Contrast with black, large text14.32:1WCAG large text: AAA

Named colours

Dark turquoise · ΔE 14.6Aqua · ΔE 16.9Cyan · ΔE 16.9Medium turquoise · ΔE 16.9Sky blue · ΔE 21Turquoise · ΔE 21.3
Nearest named CSS colourDark turquoise (#00CED1)ΔE 14.63, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#FF5640
Analogous#40FFB5, #408AFF
Triadic#FF40E9, #E9FF40
Split complementary#FF408A, #FFB640
Tetradic#B540FF, #FF5640, #8AFF40

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FFFFFF
Lighter +30%#D9FBFF
Lighter +20%#A6F5FF
Lighter +10%#73EFFF
Darker −10%#0DE3FF
Darker −20%#00C0D9
Darker −30%#0093A6
Darker −40%#006673
More saturated +25%#40E9FF
Less saturated −25%#58D7E7

Channel breakdown

R64
G233
B255
Red64 (25.1%)
Green233 (91.4%)
Blue255 (100%)
Hue186.91°
Saturation (HSL)100%
Lightness62.55%
Dominant channelBlue
Hex per channelR 40 · G E9 · B FF

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Every value on this page was computed from “40e9ff” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.