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Recognised as Colour

#183D5E

  • #183D5E
  • Blue
  • Dark
  • Nearest: Dark slate grey

#183D5E is a blue with RGB values 24, 61, 94 and HSL 208°, 59%, 23%. It is a dark colour, so white text on it reaches 11.2:1 contrast (AAA for normal text). The nearest named colour is Dark slate grey.

Colour values

#183D5E#183D5E
HEX#183D5E
RGBrgb(24, 61, 94)
RGB (0–1)0.0941, 0.2392, 0.3686
RGB percentages9.4%, 23.9%, 36.9%
HSLhsl(208.3, 59.3%, 23.1%)
HSV / HSBhsv(208.3, 74.5%, 36.9%)
CMYK74.5%, 35.1%, 0%, 63.1%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,588,574
CSS custom property--colour: #183D5E;

Brightness & contrast

Relative luminance0.0434WCAG 2.x, 0 is black and 1 is white
Perceived brightness58 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 11.24:1
Contrast with white11.24:1WCAG normal text: AAA
Contrast with black1.87:1WCAG normal text: Fail
Greyscale equivalent#383838
Inverted#E7C2A1

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#2E3E5Fno red cones; affects about 1% of men; ΔE 5.3 from the original
Deuteranopia#24385Dno green cones; the most common form, about 1% of men; ΔE 5.7 from the original
Tritanopia#004549no blue cones; rare, and affects men and women equally; ΔE 22.7 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text11.24:1WCAG large text: AAA
Contrast with black, large text1.87:1WCAG large text: Fail

Named colours

Dark slate grey · ΔE 23.4Steel blue · ΔE 29.2Dim grey · ΔE 30.6Slate grey · ΔE 30.9Dark slateblue · ΔE 33.3Light slate grey · ΔE 33.5
Nearest named CSS colourDark slate grey (#2F4F4F)ΔE 23.45, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#5E3918
Analogous#185E5C, #181A5E
Triadic#5E183D, #3D5E18
Split complementary#5E181A, #5E5C18
Tetradic#5C185E, #5E3918, #1A5E18

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#69A4D9
Lighter +30%#418CCE
Lighter +20%#2D72AF
Lighter +10%#225787
Darker −10%#0E2335
Darker −20%#03080D
Darker −30%#000000
Darker −40%#000000
More saturated +25%#093E6D
Less saturated −25%#273C4F

Channel breakdown

R24
G61
B94
Red24 (9.4%)
Green61 (23.9%)
Blue94 (36.9%)
Hue208.29°
Saturation (HSL)59.32%
Lightness23.14%
Dominant channelBlue
Hex per channelR 18 · G 3D · B 5E

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Every value on this page was computed from “183d5e” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.