BLUE

Cerulean Blue

#2A52BE

Conversions

HEX#2A52BE

RGBrgb(42, 82, 190)

HSLhsl(224, 64%, 45%)

HSVhsv(224, 78%, 75%)

CMYKcmyk(78%, 57%, 0%, 25%)

Copy CSS

color: #2a52be;
/* rgb  */ color: rgb(42, 82, 190);
/* hsl  */ color: hsl(224, 64%, 45%);

Contrast

On whitePass · 6.89 : 1

On ink blackFail · 2.78 : 1

Shades

Tints

Pairings

About Cerulean Blue

Cerulean Blue is the hex color #2A52BE, which translates to rgb(42, 82, 190) in RGB and hsl(224, 64%, 45%) in HSL. On the color wheel it sits at 224 degrees, with a saturation of 64 percent and a lightness of 45 percent. That combination gives Cerulean Blue a saturated mid tone: strong enough for buttons and links, still calm enough for larger areas.

How Cerulean Blue compares

The closest standard CSS keyword is royalblue (#4169E1), a CIE76 distance of 10.6 away in CIELAB. That is a visible difference, so the keyword is not a substitute here. In the Tailwind CSS 4.3.1 palette the nearest token is blue-800 (#193CB8), at a distance of 14.7. Inside this library the closest neighbour is Sapphire at 3.8. Sorted by lightness, Cerulean Blue is number 12 of the 30 blue colors here.

Text on Cerulean Blue

2 of the five common text colors below clear WCAG AA for normal text on Cerulean Blue, led by White at 6.89:1. The ratios are computed with the WCAG relative luminance formula, the same one the contrast checker uses, which opens with Cerulean Blue already loaded as the background.

Contrast of common text colors on Cerulean Blue. AA normal text needs 4.5:1, AA large text and non-text elements need 3:1, AAA normal text needs 7:1.
Text color	Ratio	AA normal	AA large	AAA normal
White #FFFFFF	6.89:1	Pass	Pass	Fail
Ink black #0F0F12	2.78:1	Fail	Fail	Fail
Mid grey #6B7280	1.42:1	Fail	Fail	Fail
Dark grey #374151	1.50:1	Fail	Fail	Fail
Light grey #E5E7EB	5.56:1	Pass	Pass	Fail

Building a palette around Cerulean Blue

The pairings above give you three classic starting points. The complementary color sits opposite on the wheel and works well as an accent that draws the eye. The analogous colors sit right beside Cerulean Blue for calmer, harmonious combinations. The triadic pair spaces three hues evenly for a balanced, energetic palette. Open any swatch to explore it as its own color.

Full values for Cerulean Blue

Format	Value
HEX	#2A52BE
RGB	rgb(42, 82, 190)
HSL	hsl(224, 64%, 45%)
HSV	hsv(224, 78%, 75%)
CMYK	cmyk(78%, 57%, 0%, 25%)
OKLCH	oklch(47.72% 0.1759 264.93)
CIELAB	lab(38.28 25.40 -60.71)

Use Cerulean Blue in a tool

Nearby colors

Last updated 5 August 2026 by FusionStudios. Every value on this page is computed by the same functions the tools use. How this is calculated.