Dark Blue Color Code: #00008B, RGB & HSL

Dark Blue color values

HEX #00008B

RGB rgb(0, 0, 139)

HSL hsl(240, 100%, 27%)

HSV 240, 100%, 55%

HWB hwb(240 0% 45%)

CMYK 100%, 100%, 0%, 45%

Decimal 139

CSS keyword darkblue

27%HSL lightness (dark)

100%HSL saturation (vivid)

240°Hue angle (blue)

0.019Relative luminance

CMYK is a standard screen-to-print conversion. Printed results depend on inks, paper and color profiles.

What is Dark Blue?

Dark Blue is one of the named colors defined by the CSS Color specifications (keyword “darkblue”), so every modern browser understands it without a hex code.

Its hue angle of 240° places it in the blue part of the color wheel, with 100% saturation (vivid) and 27% lightness (dark). It is a cool color.

Compared with the other blue colors in the Aqeeb Studio library, it is lighter than 13% of them and more saturated than 87% of them.

Its relative luminance is 0.019, which makes it a very dark color. That is below the 0.179 crossover point at which black and white text have equal contrast, so white text has the advantage.

Dark Blue counts as a dark color: its HSL lightness is 27% and its relative luminance is 0.019. White text reads comfortably on it (15.29:1 contrast).

Text contrast on Dark Blue

WCAG contrast of white and black text on Dark Blue
Text	Preview	Ratio	AA normal	AA large	AAA normal	AAA large
White text	Sample text	15.29:1 Excellent	Pass	Pass	Pass	Pass
Black text	Sample text	1.37:1 Poor	Fail	Fail	Fail	Fail

Ratios use the WCAG 2 formula and are truncated, never rounded up. Test any pair with the contrast checker.

Colors that go with Dark Blue

Complementary color

Complementary colors sit directly opposite each other on the color wheel (180° apart). They give the strongest hue contrast, which suits calls to action and accents.

≈ Olive#8B8B00

Analogous colors

Analogous colors are neighbors on the wheel, 30° either side of the base hue. They blend smoothly and are easy to combine in backgrounds, gradients and illustrations.

≈ Cobalt#00468B ≈ Indigo#46008B

Triadic colors

A triadic scheme uses three hues spaced 120° apart. It is lively yet balanced, and works best when one color leads and the other two act as accents.

Dark Red#8B0000 ≈ True Green#008B00

Split-complementary colors

Split-complementary keeps the base color and uses the two colors on either side of its complement (150° and 210°). The contrast is strong but gentler than a direct complement.

≈ Warm Brown#8B4600 ≈ Dark Grass Green#468B00

Tetradic colors

A tetradic (rectangle) scheme combines two complementary pairs at 0°, 60°, 180° and 240°. It offers variety but needs one dominant color to stay balanced.

Dark Magenta#8B008B ≈ Olive#8B8B00 ≈ True Green#008B00

Monochromatic variants

Monochromatic variants keep the same hue and saturation and only change lightness, which makes them dependable for UI scales and subtle layered designs.

#00001F#00001F

#000066#000066

#0000AD#0000AD

#0000F5#0000F5

#3D3DFF#3D3DFF

A “≈” before a name means the exact harmony color has no named match, so the link goes to the closest named color.

Tints and shades of Dark Blue

Lighter tints (mixed with white)

Darker shades (mixed with black)

Select any swatch to copy its HEX code. Build longer scales with the tints and shades tool.

Navy#000080 Royal#0C1793 Cobalt Blue#030AA7 Deep Blue#040273 Indigo Blue#3A18B1 Dark Royal Blue#02066F Indigo#4B0082 Ultramarine#2000B1

Where to use Dark Blue

Button, banner and badge backgrounds with white text (15.29:1 contrast)
Accents that need to stand out: call-to-action buttons, charts and illustrations
Links, buttons and primary interface accents
Corporate, finance and software branding
Headers and navigation bars
Charts and dashboards

Use Dark Blue in CSS

:root {
  --color-dark-blue: #00008B;
}

.element {
  color: var(--color-dark-blue);
  background-color: #00008B;
  border: 2px solid #00008B;
}

Questions about Dark Blue

What is the HEX code for Dark Blue?

Dark Blue is #00008B.

What is the RGB value of Dark Blue?

The RGB value of Dark Blue is 0, 0, 139: 0 red, 0 green and 139 blue on a 0–255 scale, written rgb(0, 0, 139) in CSS.

What is the HSL value of Dark Blue?

The HSL value of Dark Blue is 240°, 100%, 27% (hue, saturation, lightness), written hsl(240, 100%, 27%) in CSS.

What is the CMYK value of Dark Blue?

A standard conversion gives about C 100%, M 100%, Y 0%, K 45%. Real print results depend on the inks, paper and color profile, so treat CMYK here as a reference value.

Is Dark Blue a light or dark color?

Dark Blue counts as a dark color: its HSL lightness is 27% and its relative luminance is 0.019. White text reads comfortably on it (15.29:1 contrast).

How does Dark Blue look with white text?

White text on Dark Blue has a contrast ratio of 15.29:1, rated Excellent. It meets WCAG AA for normal text.

How does Dark Blue look with black text?

Black text on Dark Blue has a contrast ratio of 1.37:1, rated Poor. It falls below the WCAG minimum for text.

What colors go well with Dark Blue?

Olive is its complementary color, and Cobalt sits beside it as an analogous color. Lighter and darker variants of the same hue also work well for monochromatic palettes.

Where can Dark Blue be used?

It suits button, banner and badge backgrounds with white text (15.29:1 contrast); accents that need to stand out: call-to-action buttons, charts and illustrations; links, buttons and primary interface accents.

How do I use Dark Blue in CSS?

Use color: #00008B; for text, background-color: #00008B; for fills, or define a custom property such as --color-dark-blue: #00008B; and reuse it with var(--color-dark-blue).

About this color page

CSS named color (W3C CSS Color Module). Values are calculated from the HEX code; color names are labels, not trademarks or standards unless stated. Screens render colors differently, so always check important colors on your own device. See the disclaimer.

Dark Blue Color Code: #00008B