Cerulean Blue (#2A52BE)

The hex code for Cerulean Blue is #2A52BE. It is rgb(42, 82, 190) in RGB, hsl(224, 64%, 45%) in HSL, and about cmyk(78%, 57%, 0%, 25%) in CMYK — a mid-tone blue. White text is the more readable choice on this background.

#2A52BE

HEX#2A52BE

RGBrgb(42, 82, 190)

HSLhsl(224, 64%, 45%)

HSVhsv(224, 78%, 75%)

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

OKLCHoklch(47.7% 0.176 264.9)

LABlab(37.27% 17.39 -62.09)

LCHlch(37.27% 64.48 285.65)

Colors Closest to Cerulean Blue

Cerulean Blue is a registered color name. These are the named colors nearest to it, measured as CIE76 distance in CIELAB — a perceptual scale, so the ordering matches what the eye sees rather than how close the raw RGB numbers happen to sit.

Sapphire#0F52BAΔE 4.1 Violet-blue#324AB2ΔE 4.49 Absolute Zero#0048BAΔE 6.23 Cobalt Blue#0047ABΔE 6.62 New Car#214FC6ΔE 6.63 Savoy Blue#4B61D1ΔE 7.31

Browse the full index of named colors A-Z or every blue in the library.

#2A52BE Channel Values

How Cerulean Blue breaks down in each color model. Hue is measured in degrees around the color wheel; saturation, lightness, and the CMYK inks are percentages.

Model	Channels	Notes
RGB	R 42 · G 82 · B 190	8-bit channels as sent to the display
HSL	H 224° · S 64% · L 45%	Easiest model for building lighter and darker variants
HSV	H 224° · S 78% · V 75%	Matches the picker in most design tools
CMYK	C 78% · M 57% · Y 0% · K 25%	Approximate ink mix; confirm with an ICC profile before printing
Luminance	6.89:1 vs white · 3.05:1 vs black	WCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a Cerulean Blue background. AA requires 4.5:1 for normal text and 3:1 for large text; AAA requires 7:1. Contrast is one check, not a full accessibility review.

TextWhite text6.89:1AA normal ✓AA large ✓AAA normal ✗

TextBlack text3.05:1AA normal ✗AA large ✓AAA normal ✗

Need a specific ratio against another background? Open #2A52BE in the contrast checker.

Colors That Go With Cerulean Blue

Pairings derived from color-wheel relationships. The complementary color sits opposite Cerulean Blue; analogous colors sit beside it; triadic and split-complementary sets spread evenly around the wheel. Select any swatch for its own breakdown.

Base

Complementary

Analogous

Analogous

Triadic

Triadic

Split comp.

Split comp.

Tints & Shades of Cerulean Blue

Lighter tints and darker shades built by moving the lightness channel while holding hue and saturation, which is what you want for hover states, backgrounds, and text variants.

Tints

Shades

Want a full 50-950 ramp with semantic roles? Generate design tokens from #2A52BE.

How Cerulean Blue Looks with Color Vision Deficiency

Simulated with the Viénot, Brettel & Mollon LMS projection model. Anomalous types are rendered as partial versions of the matching dichromacy, which is an approximation rather than a per-person clinical model.

Typical#2A52BE

Protanopia#4D4DBE

Protanomaly#414FBE

Deuteranopia#4848BE

Deuteranomaly#3E4CBE

Tritanopia#006868

Tritanomaly#006092

Achromatopsia#5A5A5A

Test a full palette in the color blindness simulator.

Using #2A52BE in Code

Copy-ready declarations for the places this color usually ends up.

CSS custom property--cerulean-blue: #2A52BE;

CSS backgroundbackground-color: #2A52BE;

Tailwind configcolors: { 'cerulean-blue': '#2A52BE' }

SwiftUIColor(red: 0.165, green: 0.322, blue: 0.745)

Android XML<color name="cerulean_blue">#2A52BE</color>

SVG fillfill="#2A52BE"

More Blue Colors

Cerulean Blue sits in the bluefamily. These are its neighbours across that family's full range, each with its own breakdown.

2b2bc5 2a3439 2b506e 2a2069 2b7fff 297eff 2c2555 2929ff 2d14b8 2887c8 2e2d88 273be2 374049 4f69c6 666699 7c86ff 99a1af bcb5e8 dbe4eb f8f8ff 000f89 0073cf 0e0e48 193cb8

#2A52BE Frequently Asked Questions

What is the hex code for Cerulean Blue?

The hex code for Cerulean Blue is #2A52BE. That is rgb(42, 82, 190) in RGB, hsl(224, 64%, 45%) in HSL, and approximately cmyk(78%, 57%, 0%, 25%) in CMYK.

What is the RGB value of #2A52BE?

#2A52BE is rgb(42, 82, 190) — red 42, green 82, and blue 190 on the 0-255 scale.

What is the CMYK value of #2A52BE?

#2A52BE converts to approximately cmyk(78%, 57%, 0%, 25%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #2A52BE be black or white?

White text is the more readable choice. #2A52BE scores 6.89:1 against white and 3.05:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #2A52BE as a CSS color keyword?

No. #2A52BE is not one of the CSS color keywords, so it has to be written as a hex, rgb() or hsl() value. The closest keyword is royalblue (#4169E1) at a CIE76 distance of 10.57, which is visibly different.

Open Cerulean Blue in a Tool

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Keep exploring: every blue in the color library, the guide to shades of blue, or the full color library.