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Recognised as Colour

#66B580

  • #66B580
  • Green
  • Dark
  • Nearest: Medium seagreen

#66B580 is a green with RGB values 102, 181, 128 and HSL 140°, 35%, 55%. It is a dark colour, so black text on it reaches 8.5:1 contrast (AAA for normal text). The nearest named colour is Medium seagreen.

Colour values

#66B580#66B580
HEX#66B580
RGBrgb(102, 181, 128)
RGB (0–1)0.4, 0.7098, 0.502
RGB percentages40%, 71%, 50.2%
HSLhsl(139.7, 34.8%, 55.5%)
HSV / HSBhsv(139.7, 43.6%, 71%)
CMYK43.6%, 0%, 29.3%, 29%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,731,136
CSS custom property--colour: #66B580;

Brightness & contrast

Relative luminance0.37431WCAG 2.x, 0 is black and 1 is white
Perceived brightness155.6 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 8.49:1
Contrast with white2.47:1WCAG normal text: Fail
Contrast with black8.49:1WCAG normal text: AAA
Greyscale equivalent#A0A0A0
Inverted#994A7F

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#B5AA7Dno red cones; affects about 1% of men; ΔE 33.6 from the original
Deuteranopia#A9A183no green cones; the most common form, about 1% of men; ΔE 34.2 from the original
Tritanopia#56B3A7no blue cones; rare, and affects men and women equally; ΔE 22.6 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text2.47:1WCAG large text: Fail
Contrast with black, large text8.49:1WCAG large text: AAA

Named colours

Medium seagreen · ΔE 13.1Dark seagreen · ΔE 13.2Medium aquamarine · ΔE 14.1Sea green · ΔE 16.5Light seagreen · ΔE 26Light green · ΔE 27.6
Nearest named CSS colourMedium seagreen (#3CB371)ΔE 13.12, a distinctly different colour
Hue familygreen
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#B5669B
Analogous#73B566, #66B5A8
Triadic#8066B5, #B58066
Split complementary#A866B5, #B56674
Tetradic#6674B5, #B5669B, #B5A866

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#EFF8F2
Lighter +30%#CDE7D6
Lighter +20%#ABD6B9
Lighter +10%#88C69D
Darker −10%#4C9C66
Darker −20%#3B7A50
Darker −30%#2A5839
Darker −40%#1A3523
More saturated +25%#4AD176
Less saturated −25%#82998A

Channel breakdown

R102
G181
B128
Red102 (40%)
Green181 (71%)
Blue128 (50.2%)
Hue139.75°
Saturation (HSL)34.8%
Lightness55.49%
Dominant channelGreen
Hex per channelR 66 · G B5 · B 80

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Every value on this page was computed from “66b580” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.